Regulation No. 90-02

Name:Regulation No. 90-02
Description:Replacement Brake Lining Assemblies.
Official Title:Uniform Provisions Concerning the Approval of: Replacement Brake Lining Assemblies, Drum Brake Linings and Discs and Drums for Power-driven Vehicles and their Trailers.
Country:ECE - United Nations
Date of Issue:2012-02-17
Amendment Level:02 Series, Supplement 3
Number of Pages:157
Vehicle Types:Bus, Car, Component, Heavy Truck, Light Truck, Motorcycle, Trailer
Subject Categories:Braking
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Keywords:

brake, test, drum, disc, replacement, lining, vehicle, type, annex, paragraph, approval, regulation, original, braking, speed, surface, part, friction, temperature, applications, pressure, assembly, assemblies, vehicles, discs, maximum, initial, requirements, mass, dynamometer, number, tests, categories, brakes, axle, damage, application, case, diameter, performance, inertia, linings, table, force, torque, deceleration, drums, cycles, procedure, load

Text Extract:

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E/ECE/324
) Rev.1/Add.89/Rev.3/Amend.3
E/ECE/TRANS/505 )
February 22, 2017
STATUS OF UNITED NATIONS REGULATION
ECE 90-02
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF:
REPLACEMENT BRAKE LINING ASSEMBLIES, DRUM BRAKE LININGS
AND DISCS AND DRUMS FOR POWER-DRIVEN VEHICLES
AND THEIR TRAILERS
Incorporating:
Supplement 3 to the 01 series of amendments
Date of Entry into Force: 13.11.99
Supplement 4 to the 01 series of amendments
Date of Entry into Force: 29.12.00
Supplement 5 to the 01 series of amendments
Date of Entry into Force: 07.12.02
Supplement 6 to the 01 series of amendments
Date of Entry into Force: 09.11.05
Supplement 7 to the 01 series of amendments
Date of Entry into Force: 18.01.06
Supplement 8 to the 01 series of amendments
Date of Entry into Force: 02.02.07
Supplement 9 to the 01 series of amendments
Date of Entry into Force: 10.11.07
Corr. 1 of 08.04.08 to Revision 1
Dated: 12.03.08
Supplement 10 to the 01 series of amendments
Date of Entry into Force: 15.10.08
Corr. 1 to Revision 2 of the Regulation
Dated: 30.07.10
Supplement 11 to the 01 series of amendments
Date of Entry into Force: 24.10.09
02 series of amendments
Date of Entry into Force: 28.10.11
Corr. 1 to Revision 3 of the Regulation
Dated: 14.11.12
Supplement 1 to the 02 series of amendments
Date of Entry into Force: 18.11.12
Corr. 1 to Supplement 1 to the 02 series of amendments
Dated: 18.11.12
Supplement 2 to the 02 series of amendments
Date of Entry into Force: 22.01.15
Supplement 3 to the 02 series of amendments
Date of Entry into Force: 09.02.17

REGULATION No. 90-02
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF REPLACEMENT
BRAKE LINING ASSEMBLIES, DRUM BRAKE LININGS AND DISCS AND DRUMS
FOR POWER-DRIVEN VEHICLES AND THEIR TRAILERS
CONTENTS
REGULATION
1.
Scope
2.
Definitions
3.
Application for approval
4.
Approval
5.
Specifications and tests
6.
Packaging and marking
7.
Modifications and extension of approval of the replacement parts
8.
Conformity of production
9.
Penalties for non-conformity of production
10.
Production definitely discontinued
11.
Names and addresses of Technical Services responsible for conducting approval tests, and of
Type Approval Authorities
12.
Transitional provisions
ANNEXES
Annex 1A: Communication concerning the approval or extension or refusal or withdrawal of approval or
production definitely discontinued of a replacement brake lining assembly or replacement
drum brake lining pursuant to Regulation No. 90
Annex 1B: Communication concerning the approval or extension or refusal or withdrawal of approval or
production definitively discontinued of a replacement brake disc or a replacement brake
drum pursuant to Regulation No. 90
Annex 2:
Annex 3:
Annex 4:
Annex 5:
Annex 6:
Arrangements of the approval mark and approval data
Requirements for replacement brake lining assemblies for vehicles of Categories M , M
and N
Requirements for replacement brake lining assemblies and drum brake linings for vehicles
of Categories M , N and N
Requirements for replacement brake lining assemblies for vehicles of Categories O and O
Requirements for replacement brake lining assemblies and drum brake linings for vehicles
of Categories O and O
Annex 7: Requirements for replacement brake lining assemblies for vehicles of Category L.

REGULATION No. 90-02
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF REPLACEMENT BRAKE
LINING ASSEMBLIES, DRUM BRAKE LININGS AND DISCS AND DRUMS FOR
POWER-DRIVEN VEHICLES AND THEIR TRAILERS
1. SCOPE
1.1. This Regulation applies to the basic braking function of the following replacement parts :
1.1.1. Replacement brake lining assemblies intended for use in friction brakes forming part of a
braking system of vehicles of Category M, N, L and O which have a type approval in
accordance with Regulations Nos. 13, 13-H or 78.
1.1.2. Replacement drum brake linings designed to be riveted to a brake shoe for fitment to and use
on vehicles of Category M , N , N , O or O having a type approval in accordance with
Regulation No. 13.
1.1.3. The replacement brake lining assemblies used for separate parking brake systems being
independent of the vehicle service brake system will be subject only to the technical
prescriptions defined in Annex 8 of this Regulation.
1.1.4. Replacement brake drums and discs intended for use in friction brakes forming part of a
braking system of vehicles of Category M, N and O which have a type approval in accordance
with Regulation No. 13 or Regulation No. 13-H.
1.1.5. Replacement brake discs intended for use in friction brakes forming part of a braking system
of vehicles of Categories L , L , L , L and L , which have a type approval in accordance with
Regulation No. 78.
1.2. Original brake discs, brake drums, brake lining assemblies and drum brake linings fitted at
time of manufacturing of the vehicle and original replacement brake discs, brake drums, brake
lining assemblies and drum brake linings intended for the servicing of the vehicle are not
subject to this Regulation.
1.3. This Regulation does not apply to "Special parts", as defined in Paragraph 2.3.4.
2. DEFINITIONS
2.1. General Definitions
2.1.1. "Manufacturer" means the organization which can assume technical responsibility for the
brake lining assemblies or drum brake linings or brake drums and discs and can demonstrate
that it possesses the necessary means to achieve conformity of production.
2.1.2. "Replacement part" means either a replacement brake lining assembly type, a replacement
drum brake lining type, a replacement drum brake lining, a replacement brake drum or a
replacement brake disc.

2.2.10. "Original drum brake lining" means a drum brake lining conforming to the data attached to
a vehicle type approval documentation.
2.2.11. "Replacement drum brake lining" means a drum brake lining of a type approved under this
Regulation as a suitable service replacement when fitted to a shoe for an original drum brake
lining.
2.2.12. "Parking brake lining assembly" means a pad assembly or shoe assembly belonging to a
parking brake system separate and independent from the service brake system.
2.2.13. "Identical brake lining assembly" is a replacement brake lining assembly identical to the
brake lining assembly supplied and fitted as original equipment and included in the vehicle
type approval to Regulation No. 13 or Regulation No. 13-H with the exception of the
vehicle/brake assembly manufacturers mark which is omitted.
2.2.14. "Identical drum brake lining" is a replacement drum brake lining identical to the drum brake
lining supplied and fitted as original equipment and included in the vehicle type approval to
Regulation No. 13 or Regulation No. 13-H with the exception of the vehicle/brake assembly
manufacturers mark which is omitted.
2.3. Definitions regarding the approval of a replacement brake drum or a replacement brake disc.
2.3.1. "Original brake disc/brake drum"
2.3.1.1. In the case of motor vehicles, is a brake disc/drum covered by the vehicle braking system
type approval according to Regulation Nos. 13, 13-H or 78.
(a)
(b)
Is a brake disc/drum covered by the vehicle braking system type approval according to
Regulation No. 13;
Is a brake disc/drum which is part of a brake for which the axle manufacturer owns a
test report according to Annex 11 of Regulation No. 13.
2.3.2. "Identification code" identifies the brake discs or brake drums covered by the braking
system approval according to Regulations Nos. 13 and 13-H. It contains at least the
manufacturer's trade name or trademark and an identification number.
The vehicle manufacturer shall provide on request of the technical service and/or approval
authority the necessary information, which makes the link between the braking system type
approval and the corresponding identification code.
2.3.3. Replacement Parts
2.3.3.1. "Original replacement brake discs and brake drums"
2.3.3.1.1. In the case of vehicle Categories M, N and O: original brake discs/ brake drums intended for
servicing the vehicle and carrying an identification code as defined in Paragraph 2.3.2. affixed
in such a way as to be indelible and clearly legible.
2.3.3.1.2. In the case of vehicle Categories L , L , L , L and L : original brake discs/ brake drums
intended for servicing the vehicle.

2.3.7. "Test group": type of brake discs/drums having the same characteristics pursuant to
Paragraph 5.3.6.
2.3.8. "Variant": individual brake disc/drum within a given test group.
2.3.9. "Material": chemical composition and mechanical properties as per Paragraph 3.4.1.2.
2.3.10. "Material group": e.g. grey cast iron, steel, aluminum, etc.
2.3.11. "Material sub-group": one of the sub-group defined in paragraph 5.3.3.2.
2.3.12. "Minimum thickness": the thickness of the brake disc is the point at which replacement
becomes necessary.
2.3.13. "Maximum inside diameter": the maximum inside diameter of the brake drum is the point at
which replacement becomes necessary.
3. APPLICATION FOR APPROVAL
3.1. An application for approval of a replacement part for (a) specific vehicle type(s) shall be
submitted by the manufacturer of the replacement part or his duly accredited representative.
3.2. An application may be submitted by the holder of (a) vehicle type approval(s) to Regulation
No. 13 or 13-H or 78 in respect of replacement part conforming to the type recorded in the
vehicle type approval(s) documentation.
3.3. In the case of an application regarding the approval of a replacement brake lining assembly
type, a replacement drum brake lining type or a replacement drum brake lining:
3.3.1. An application for approval shall be accompanied, in triplicate, by a description of the
replacement brake lining assembly or replacement drum brake lining with regard to the items
specified in Annex 1 to this Regulation, and by the following particulars:
3.3.1.1. Diagrams showing functional dimensions of the replacement brake lining assembly or
replacement drum brake lining;
3.3.1.2. An indication of the positions of the replacement brake lining assembly or replacement drum
brake lining on the vehicles for which approval to fit is sought.
3.3.2. Brake lining assemblies or drum brake linings of the type for which approval is sought shall be
made available in sufficient quantity to perform the approval tests.
3.3.3. The applicant shall agree with and make available to the technical service responsible for
conducting approval tests the suitable representative vehicle(s) and/or brake(s).
3.3.4. The Competent Authority shall verify the existence of satisfactory arrangements for ensuring
effective control of the conformity of production before type approval is granted.
3.3.4.1. The applicant shall submit values for friction behaviour in accordance with Annex 9, Part A,
Paragraph 2.4.1. or 3.4.1. respectively of this Regulation 3.4. In the case of an application
regarding the approval of a replacement brake drum or a replacement brake disc.

3.4.2. Conformity of Production
The competent authority shall verify the existence of satisfactory arrangements for ensuring
effective control of the conformity of production before type approval is granted.
3.4.2.1. The applicant shall submit the documentation in accordance with Annex 9, Part B and Part C,
Paragraph 2. of this Regulation.
3.4.3. Sample Quantities and Usage
3.4.3.1. A minimum number of disc or drum samples – of the design for which approval is requested –
shall be provided, as shown in the following table.
The table also shows the recommended use of the samples.
Item No.
Check/Test
Sample number for brake
discs for vehicles of
Categories M, N and O
Remarks
1 2 3 4 5 6
1 Geometric check
Paragraphs 5.3.3.1., 5.3.4.1.
X X X X X X
2 Material check
Paragraphs 5.3.3.2.
X
X
3 Balancing provisions check
Paragraph 5.3.7.2.
4 Wear condition marking check
Paragraph 5.3.7.3.
X X X X
X X X X
5 Integrity test − thermal fatigue
Paragraphs 4.1.1., 4.2.1. of
Annex 11, 4.1.1., 4.2.1. of Annex 12
X
X
6 Integrity test − high load test
Paragraphs 4.1.2., 4.2.2. of
Annex 11, and Paragraphs 4.1.2.,
4.2.2. of Annex 12
X
7 Service brake vehicle performance
test
Paragraph 2.2. of Annex 11,
Paragraph 2.2. of Annex 12
8 Parking brake vehicle performance
test
Paragraph 2.3. of Annex 11,
Paragraph 2.3. of Annex 12
9 Service brake dynamometer
performance test
Paragraph 3.3. of Annex 11,
Paragraph 3.3. of Annex 12
Pair of
discs
Pair of
discs
X
Either front
or rear axle
If
applicable
Alternative
to vehicle
test

4. APPROVAL
4.1. If the replacement part submitted for approval pursuant to this Regulation meet the
requirements of Paragraph 5. below, approval of the replacement part shall be granted.
4.1.1. In the case of replacement brake lining assemblies for vehicles of Category L with a
combined braking system in the meaning of Paragraph 2.9. of Regulation No. 78, the
approval must be restricted to the brake lining assembly combination(s) on the axles of the
vehicle having been tested according to Annex 7 of this Regulation.
4.2. To each replacement part approved there shall be assigned an approval number comprising
four groups of digits:
4.2.1. The first two digits (at present 02 for the Regulation in its 02 series of amendments) shall
indicate the series of amendments incorporating the most recent major technical amendments
made to the Regulation at the time of issue of the approval.
4.2.2. The following single digit shall indicate the category of the replacement part as follows:
A
B
C
D
Replacement brake lining assembly
Replacement drum brake lining
Replacement brake disc
Replacement brake drum
4.2.3. The next series of digits shall indicate the manufacture and the type of the brake lining, the
type of disc or the type of drum.
The digital suffix shall indicate:
(a)
(b)
The shoe or back plate or specific dimension in the case of drum brake linings;
The Test Group in the case of a replacement disc or replacement drum.
The variants approved as a Test Group shall be listed as an Appendix to the communication
document:

4.3. The same Contracting Party may not assign the same number to another replacement part.
The same type approval number may cover the use of that replacement part on a number of
differing vehicle types.
4.4. Notice of approval or of extension or refusal of approval or withdrawal of approval or
production definitively discontinued of a replacement part pursuant to this Regulation shall be
communicated to the Parties to the 1958 Agreement which apply this Regulation by means of
a form conforming to the model in Annex 1 to this Regulation.
4.5. There shall be affixed, conspicuously and in a readily accessible place, to every replacement
part approved under this Regulation, an international approval mark consisting of:
4.5.1. A circle surrounding the letter "E" followed by the distinguishing number of the country which
has granted approval ;
4.5.2. The number of this Regulation, followed by the letter "R", a dash and the approval number to
the right of the circle prescribed in paragraph 4.5.1.
4.6. The approval mark referred to in Paragraph 4.5. above shall be clearly legible and be
indelible.
4.7. Annex 2 to this Regulation gives examples of arrangements of the approval mark and
approval data referred to above and in Paragraph 6.1.5. below.
5. SPECIFICATIONS AND TESTS
5.1. General
A replacement part shall be so designed and constructed that, when substituted for the part
originally fitted to a vehicle, the braking efficiency of that vehicle accords with that of the
approved vehicle type.
Specifically:
(a)
(b)
(c)
(d)
(e)
A replacement part for a vehicle type approved prior to Regulation No. 13, 09 series of
amendments, or the original version of Regulation No. 13-H or Regulation No. 78, 01
series of amendments, shall satisfy as a minimum the appropriate above-mentioned
Regulation level;
A replacement part shall display performance characteristics similar to that of the
original part it is intended to replace;
A replacement part must possess adequate mechanical characteristics;
Brake linings shall not contain asbestos;
A replacement brake disc/drum shall exhibit sufficient deformation resistance under
temperature;

5.2. Requirements regarding the approval of a replacement brake lining assembly type, a
replacement drum brake lining type or a replacement drum brake lining
5.2.1. Performance Requirements
5.2.1.1. Replacement brake lining assemblies for vehicles of Categories M , M and N
At least one set of replacement brake lining assemblies, representing the type of lining to be
approved, shall be installed and tested in at least one vehicle which is representative of the
vehicle type for which approval is sought, according to the prescriptions of Annex 3 and shall
satisfy the requirements stated in this annex. The representative vehicle(s) shall be selected
from among the application range using a worst case analysis . For speed sensitivity and
cold performance equivalence, one of the two methods described in Annex 3 shall be used.
5.2.1.2. Replacement brake lining assemblies and replacement drum brake linings for vehicles of
Categories M , N and N
At least one set of replacement brake lining assemblies or replacement drum brake linings,
representing the type of lining to be approved, shall be installed and tested in at least one
vehicle or a brake which is representative of the vehicle type for which approval is sought,
according to the prescriptions of Annex 4, using one of the two methods described in
Paragraph 1. (vehicle test) or in Paragraph 2. (inertia dynamometer test) and shall satisfy the
requirements stated in this annex. The representative vehicle(s) or brake(s) shall be selected
from among the application range using a worst case analysis .

5.2.2.2. Replacement brake lining assemblies and replacement drum brake linings for vehicles of
Categories M , N , N , O , and O
5.2.2.2.1. Shear Strength
This test applies only to disc brake pad assemblies. Replacement brake lining assemblies of
the type for which approval is requested shall be tested for shear strength according to
Standard ISO 6312:1981 or ISO 6312:2001. Brake lining assemblies may by divided into two
or three parts to match the test machine's capability.
The minimum acceptable shear strength is 250 N/cm .
5.2.2.2.2. Compressibility
Replacement brake lining assemblies and replacement drum brake linings of the type for
which approval is requested shall be tested for compressibility according to standard either
ISO 6310:1981, ISO 6310:2001 or ISO 6310:2009. Flat specimens according to sample
Type I may be used.
The compressibility values shall not exceed 2% at ambient temperature and 5% at 400°C for
pad assemblies and 2% at ambient temperature and 4% at 200°C for shoe assemblies and
drum brake linings.
5.2.2.2.3. Material Hardness
This requirement applies to drum brake lining assemblies and drum brake linings.
Replacement brake lining assemblies or replacement drum brake linings of the type for which
approval is requested shall be tested for hardness according to Standard ISO 2039-2:1987.
The hardness figure for the friction material at the rubbing surface shall be the mean value out
of five sample linings from different production batches (if available) by taking five
measurements at different places of each brake lining.
5.3. Technical requirements regarding the approval of a replacement brake drum or a replacement
brake disc
All replacement parts have to be separated in 4 groups:
(a)
(b)
(c)
(d)
Original replacement brake disc/drum;
Identical brake disc/drum;
Equivalent disc/drum;
Interchangeable disc/drum.

5.3.2.2. Since the identical brake discs/drums fulfils all requirement as the Original part no testing
requirements are prescribed.
5.3.3. Equivalent Replacement Discs or Drums
5.3.3.1. Geometric Requirements
The brake discs or drums shall be identical to the original brake disc or drum in respect to all
dimensions, geometric features, tolerances and basic design.
5.3.3.1.1. (*) For discs the following maximum values shall be met:
M , N , O , O M , M , N , N , O , O L , L , L , L , L
Thickness variation 0.015mm 0.030mm 0.020mm
Cheek thickness variation (for
ventilated disc only)
1.5mm
2.0mm
Lateral run-out friction surface 0.050mm
0.150mm
0.150mm
Location bore variation
H9
H9
D10 or H11
"Top hat" parallelism
0.100mm
0.100mm

Location face flatness
0.050mm
0.050mm
0.100mm
Friction surface roughness
3.2μm
3.2μm
1.6μm
5.3.3.1.2. (*) For drums the following maximum values shall be met:
M , N , O , O
M , M , N , N , O , O
Radial run-out friction surface
0.050mm
0.100mm
Location bore variation
H9
H9
Ovality
0.040mm
0.150mm
Location face flatness
0.050mm
0.050mm
Friction surface roughness
3.5µm
3.5µm
(*)

5.3.3.3. Performance Requirements
The part has to pass the integrity tests for high load and thermal fatigue according to
Annexes 11 and 12.
5.3.3.3.1. Brake disc and brake drum for Categories M, N and O
The part has to pass the integrity tests for high load and thermal fatigue according to
Annexes 11 and 12.
5.3.3.3.2. Brake Disc for Categories L , L , L , L and L
The part has to pass the integrity tests for high load and thermal fatigue according to
Annexes 14.
5.3.4. Interchangeable Replacement Discs or Drums
5.3.4.1. Geometric Requirements
As Paragraphs 5.3.4.1.1. and 5.3.4.1.2. plus the same interface dimensions.
An interchangeable replacement disc or drum may differ from the original part disc in design
features such as:
5.3.4.1.1. For discs, the following maximum values shall be met:
M , N , O , O M , N , M , N , O , O
Thickness variation 0.015mm 0.030mm 0.040mm
Cheek thickness variation (for ventilated
disc only)
1.5mm 2.0mm 2.0mm
Lateral run-out friction surface 0.050mm 0.15mm 0.15mm
Location bore variation H9 H9 H9
"Top hat" parallelism 0.100mm 0.100mm 0.100mm
Location face flatness 0.050mm 0.050mm 0.050mm
Friction surface roughness 3.2μm 3.2μm 3.2μm
5.3.4.1.2. For drums, the following maximum values shall be met:
M , N , O , O
M , M , N , N , O , O
Radial run-out friction surface
0.050mm
0.100mm
Location bore variation
H9
H9
Ovality
0.040mm
0.150mm
Location face flatness
0.050mm
0.050mm
Friction surface roughness
3.5μm
3.5μm

5.3.6. Test Group Criteria (within the same type)
It is only possible to test interchangeable parts in Test Groups if the connection between the
mounting area and the disc friction faces are of the same general form.
From each of the test groups mentioned below, at least one variant is subject to the
corresponding tests laid down in Annexes 10, 11 or 12. The variant chosen from within a
test group to test the replacement part is that which has the highest ratio of kinetic energy to
its directly corresponding replacement part mass:

Max ⎜

m
E
⎞ ⎛

0.5 ⋅ m ⋅ v
⎟ = Max


m





With:
v maximum design speed of the vehicle to which the replacement part is fitted
(in the case of trailers v is assumed at least at 80km/h)
m test mass as defined in Annex 11, Paragraph 3.2.1.2. and Annex 12,
Paragraph 3.2.1.2. and Annex 14, Paragraph 4.2.1.2.
m mass of the replacement part of the corresponding vehicle
5.3.6.1. Replacement Brake Discs
5.3.6.1.1. Criteria concerning the formation of test groups with regard to replacement brake discs in
vehicles belonging to Categories M , M , N , N , O and O
5.3.6.1.1.1. Test group relating to the tests stipulated in Paragraphs 1. to 4. of Annex 11 or Annex 12
This test group includes all brake discs where the outside diameter of the disc do not vary
by more than 6mm and the disc thickness by not more than 4mm.
5.3.6.1.1.2. In the case of different materials within a group of materials, proof shall be furnished for
each separate material that the requirements stipulated in Annex 11 or Annex 12 are met.
5.3.6.1.2. Criteria concerning the formation of test groups with regard to replacement brake discs in
vehicles belonging to Categories M , N , O and O
5.3.6.1.2.1. Test group relating to the tests stipulated in Paragraphs 1. to 4. of Annex 11 or Annex 12
This test group includes all brake discs where the outside diameter of the disc does not vary
by more than 10mm and the disc thickness by not more than 4mm.
5.3.6.1.2.2. In the case of different materials within a group of materials, proof shall be furnished for
each separate material that the requirements stipulated in Annex 11 or Annex 12 are met.
5.3.6.1.3. Criteria concerning the formation of test groups with regard to replacement brake discs in
vehicles belonging to Categories L , L , L , L and L .
5.3.6.1.3.1. Test group relating to the tests stipulated of Annex 14.
This test group includes all brake discs according to the criteria set out in Annex 15.

(i)
Additionally, in the case of ventilated brake discs:
(i)
(ii)
(iii)
The type of ventilation (internal/external);
The number of ribs and pillars;
The dimensions of the ventilation duct.
5.3.7.2. Balancing Provision
The balancing provision with regard to the replacement brake discs/drums shall correspond to
that of the original part being replaced.
5.3.7.3. Assessment of the wear condition of the friction surfaces
5.3.7.4. Tests
This shall conform to the vehicle manufacturer criteria.
Each test group (see Paragraph 5.3.6.) within a particular type of replacement brake
disc/drum (see Paragraph 5.3.5.) shall be tested by the Technical Service.
5.3.8. Test Report
A test report shall be produced, the content of which shall be at least that defined in Annex 13
to this Regulation.
6. PACKAGING AND MARKING
6.1. Packaging and marking requirements regarding a replacement brake lining assembly type, a
replacement drum brake lining type or a replacement drum brake lining:
6.1.1. Replacement brake lining assemblies or replacement drum brake linings conforming to a type
approved in accordance with this Regulation shall be marketed in axle sets.
6.1.2. Each axle set shall be contained in a sealed package constructed to show previous opening.
6.1.3. Each package shall display the following information:
6.1.3.1. The quantity of replacement brake lining assemblies or replacement drum brake linings in the
package;
6.1.3.2. Manufacturer's name or trade mark;
6.1.3.3. Make and type of replacement brake lining assemblies or replacement drum brake linings;
6.1.3.4. The vehicles/axles/brakes for which the contents are approved;
6.1.3.5. The approval mark.

6.2.2. Marking
Every brake disc/drum approved in accordance with this Regulation shall be durably marked
with at least the following information:
6.2.2.1. Manufacturer's name or trade mark;
6.2.2.2. The approval number;
6.2.2.3. Part number
6.2.2.4. An indication which provides traceability of the production process (e.g. date, batch number,
source code);
6.2.2.5. The minimum thickness of the brake disc or the maximum permissible inside diameter of the
brake drum.
7. MODIFICATIONS AND EXTENSION OF APPROVAL OF REPLACEMENT PARTS
7.1. Every modification of the replacement part shall be notified to the Type Approval Authority
which granted the type approval. The department may then either:
7.1.1. Consider that the modifications made are unlikely to have appreciable adverse effects and
that in any event the replacement part still complies with the requirements; or
7.1.2. Require a further test report from the technical service responsible for conducting the tests.
7.2. Confirmation or refusal of approval, specifying the alterations, shall be notified by the
procedure specified in Paragraph 4.4. above to the Parties to the 1958 Agreement applying
this Regulation.
7.3. The Competent Authority issuing the extension of approval shall assign a series number for
such an extension and inform thereof the other Parties to the 1958 Agreement applying this
Regulation by means of a communication form conforming to the model in Annex 1 to this
Regulation.

8.5.4. The competent authority may carry out any tests prescribed in this Regulation.
8.5.5. The normal frequency of inspections authorized by the Competent Authority shall be one per
year. In the case where negative results are recorded during one of these visits, the
competent authority shall ensure that all necessary steps are taken to re-establish the
conformity of production as rapidly as possible.
9. PENALTIES FOR NON-CONFORMITY OF PRODUCTION
9.1. The approval granted in respect of a replacement brake lining assembly type or drum brake
lining type pursuant to this Regulation may be withdrawn if the requirements laid down in
Paragraph 8.1. above are not complied with. The approval granted in respect of the type of a
replacement brake drum or a replacement brake disc pursuant to this Regulation may be
withdrawn if the requirements laid down in Paragraph 8.1. above are not complied with.
9.2. If a Contracting Party to the Agreement applying this Regulation withdraws an approval it has
previously granted, it shall forthwith so notify the other Contracting Parties applying this
Regulation, by means of a communication form conforming to the model in Annex 1A or
Annex 1B to this Regulation.
10. PRODUCTION DEFINITIVELY DISCONTINUED
If the holder of the approval completely ceases to manufacture a replacement part approved
in accordance with this Regulation, he shall so inform the authority which granted the
approval. Upon receiving the relevant communication that authority shall inform thereof the
other Parties to the 1958 Agreement applying this Regulation by means of a communication
form conforming to the model in Annex 1A or 1B to this Regulation.
11. NAMES AND ADDRESSES OF TECHNICAL SERVICES RESPONSIBLE FOR
CONDUCTING APPROVAL TESTS, AND OF TYPE APPROVAL AUTHORITIES
The Contracting Parties to the 1958 Agreement which apply this Regulation shall
communicate to the United Nations secretariat the names and addresses of the Technical
Services responsible for conducting approval tests and of the Type Approval Authorities
which grant approval and to which forms certifying approval or extension or refusal or
withdrawal of approval, or production definitively discontinued, issued in other countries, are
to be sent.
12. TRANSITIONAL PROVISIONS
12.1. As from the official date of entry into force of the 02 series of amendments, no Contracting
Party applying this Regulation shall refuse to grant approval under this Regulation as
amended by the 02 series of amendments.
12.2. Even after the date of entry into force of the 02 series of amendments, brake lining assembly
and drum brake lining approvals to the 01 series of amendments to the Regulation shall
remain valid and Contracting Parties applying the Regulation shall continue to accept them
and shall not refuse to grant extensions of approval to the 01 series of amendments to this
Regulation.
12.3. Contracting Parties applying this Regulation shall continue to allow fitting or use on a vehicle
in use of a replacement brake lining assembly approved to this Regulation in its original,
unamended form.

8. Technical Service responsible for approval tests .................................................................................
8.1 Date of test report .................................................................................................................................
8.2 Number of test report ...........................................................................................................................
9. Approval granted/extended/refused/withdrawn .................................................................................
10. Place .....................................................................................................................................................
11. Date ......................................................................................................................................................
12. Signature ..............................................................................................................................................
13. Annexed to this communication is a list of documents in the approval file deposited at the Type
Approval Authorities having delivered the approval and which can be obtained upon request.

ANNEX 2
ARRANGEMENTS OF THE APPROVAL MARK AND APPROVAL DATA
(See Paragraph 4.2. of this Regulation)
a = 8mm min.
The above approval mark shows that the item concerned has been approved in France (E2) pursuant to
Regulation No. 90 under approval number C0359/7248. The first two digits of the approval number
indicate that the approval was granted in accordance with the requirements of Regulation No. 90 as
amended by the 02 series of amendments.

ANNEX 3
REQUIREMENTS FOR REPLACEMENT BRAKE LINING ASSEMBLIES
FOR VEHICLES OF CATEGORIES M , M AND N
1. CONFORMANCE WITH REGULATION NO. 13 OR 13-H
Compliance with the requirements of Regulation No. 13 or 13-H shall be demonstrated in a
vehicle test.
1.1. Vehicle Preparation
1.1.1. Test Vehicle
A vehicle which is representative of the type(s) for which the replacement brake lining
assembly approval is required shall be equipped with the replacement brake lining
assemblies of the type for which approval is requested and instrumented for brake testing as
required by Regulations Nos. 13 and 13-H.
Brake linings submitted for test shall be fitted to the relevant brakes and, until a fixed
burnishing procedure is established, shall be burnished to the manufacturer's instructions in
agreement with the technical service.
1.1.2. Bedding (Burnishing) Procedure
1.1.2.1. General Conditions
Brake lining assemblies submitted for test shall be fitted to the relevant brakes. In the case of
replacement brake lining assemblies, new brake linings must be used. Drum brake linings
may be machined to achieve the best possible initial contact between the linings and drum(s).
The test vehicle shall be fully laden.
Original brake lining assemblies used for comparison test and already fitted to the test vehicle
may be used provided they are in a good condition and have not been worn out by more than
20% of the initial thickness. They must not show damages, cracks, excessive corrosion or
signs of overheating. They shall be bedded to the procedure described below.
1.1.2.2. Procedure
Perform a minimum 50km driving distance and at least 100 brake applications at varying
decelerations (at least between 1ms² and 5ms²) with initial speeds between 50km/h and
120km/h. A temperature range between 250°C and 500°C for pad assemblies or between
150°C and 250°C for drum brake lining assemblies (measured at the rubbing surface of the
disc or drum) must be achieved at least 3 times during the bedding procedure. Temperatures
must not exceed 500°C for pad assemblies and 250°C for drum brake lining assemblies.

2. ADDITIONAL REQUIREMENTS
Compliance with the additional requirements shall be demonstrated by using one of the two
following methods:
2.1. Vehicle Test (split axle test)
For this test the vehicle shall be fully laden and all brake applications made with engine
disconnected, on a level road.
The vehicle service brake control system shall be equipped with a means of isolating front
and rear axle brakes so that either may be used independently of the other.
Where brake lining assembly approval is required for front axle brakes the rear axle brakes
shall remain inoperative throughout the test.
Where brake lining assembly approval is required for rear axle brakes the front axle brakes
shall remain inoperative throughout the test.
2.1.1. Cold Performance Equivalence Test
A comparison of the cold performance of the replacement brake lining assembly and the
original brake lining assembly shall be made by comparing the results of testing to the
following method:
2.1.1.1. Make a minimum of six brake applications at spaced increments of pedal effort or line
pressure up to wheel lock or, alternatively, up to a mean fully developed deceleration of 6ms
or up to the allowed maximum pedal force for the category of vehicle in question from an
initial speed as given in the table below:
Vehicle Category
Front Axle
Test Speed in km/h
Rear Axle
M 70 45
M 50 40
N 65 50
The initial brake temperature at the start of each application shall be ≤100°C.
2.1.1.2. Note and plot pedal force or line pressure and mean fully developed deceleration for each
application, and determine the pedal force or line pressure required to achieve (if possible) a
mean fully developed deceleration of 5ms for front axle brakes and 3ms for rear axle
brakes. If these values cannot be achieved with the maximum allowed pedal force determine
alternatively the pedal force or line pressure required to achieve maximum deceleration.
2.1.1.3. The replacement brake lining assembly shall be considered to show similar performance
characteristics to the original brake lining assembly if the achieved mean fully developed
decelerations at the same control force or line pressure in the upper two thirds of the
generated curve are within 15% of those obtained with the original brake lining assembly.

2.2.2.3. Brake linings submitted for test shall be fitted to the relevant brakes and bedded (burnished)
according to the following procedure:
Burnishing phase 1, 64 snubs from 80km/h to 30km/h at varying line pressures:
Rear Axle
Rear Axle
Parameter Front Axle Disc Brake Drum Brake
Number of snubs per cycle 32 32 32
Brake speed (km/h) 80 80 80
Release speed (km/h) 30 30 30
Initial brake temperature (°C) <100 <100 <80
Final brake temperature (°C) Open Open Open
Pressure snub 1 (kPa) 1 500 1 500 1 500
Pressure snub 2 (kPa) 3 000 3 000 3 000
Pressure snub 3 (kPa) 1 500 1500 1 500
Pressure snub 4 (kPa) 1 800 1 800 1 800
Pressure snub 5 (kPa) 2 200 2 200 2 200
Pressure snub 6 (kPa) 3 800 3 800 3 800
Pressure snub 7 (kPa) 1 500 1 500 1 500
Pressure snub 8 (kPa) 2 600 2 600 2 600
Pressure snub 9 (kPa) 1 800 1 800 1 800
Pressure snub 10 (kPa) 3 400 3 400 3 400
Pressure snub 11 (kPa) 1 500 1 500 1 500
Pressure snub 12 (kPa) 2 600 2 600 2 600
Pressure snub 13 (kPa) 1 500 1 500 1 500
Pressure snub 14 (kPa) 2 200 2 200 2 200
Pressure snub 15 (kPa) 3 000 3 000 3 000
Pressure snub 16 (kPa) 4 600 4 600 4 600
Pressure snub 17 (kPa) 2 600 2 600 2 600
Pressure snub 18 (kPa) 5 100 5 100 5 100
Pressure snub 19 (kPa) 2 200 2 200 2 200
Pressure snub 20 (kPa) 1 800 1 800 1 800
Pressure snub 21 (kPa) 4 200 4 200 4 200

Rear Axle
Rear Axle
Parameter Front Axle Disc Brake Drum Brake
Initial temperature 8 (°C) <445 <445 <254
Initial temperature 9 (°C) <465 <465 <262
Initial temperature 10 (°C) <483 <483 <270
Number of cycles 1 1 1
Recovery, 18 snubs from 80km/h to 30km/h at line pressure of 3 000kPa:
Rear Axle
Rear Axle
Parameter Front Axle Disc Brake Drum Brake
Number of stops per cycle 18 18 18
Brake speed (km/h) 80 80 80
Release speed (km/h) 30 30 30
Pressure (kPa) 3 000 3 000 3 000
Initial brake temperature (°C) <100 <100 <80
Final brake temperature (°C) Open Open Open
Number of cycles 1 1 1
2.2.2.4. Perform 5 brake applications from 80km/h to 0km/hat a line pressure of 4 MPa and with an
initial temperature of 100°C for each stop. The 5 consecutive non-monotonic results must
remain within the tolerance of 0.6ms² of their mean fully developed deceleration.
If this requirement is not fulfilled the first part of the bedding procedure "Burnishing Phase 1"
must be repeated until the required performance stability is achieved.
2.2.2.5. The use of cooling air is permitted. The speed of the airflow during the brake application at
the brake shall be:
v = 0.33 v
Where:
v = vehicle test speed at initiation of braking.

ANNEX 4
REQUIREMENTS FOR REPLACEMENT BRAKE LINING ASSEMBLIES AND DRUM
BRAKE LININGS FOR VEHICLES OF CATEGORIES M , N AND N
1. VEHICLE TEST
1.1. Test Vehicle
A vehicle which is representative of the type(s) for which the replacement brake lining
assembly approval or drum brake lining approval is required shall be equipped with brake
lining assemblies or drum brake linings of the type for which approval is sought and
instrumented for brake testing as required by Regulation No. 13.
Brake linings submitted for test shall be fitted to the relevant brakes and, until a fixed
burnishing procedure is established, shall be burnished to the manufacturer's instructions in
agreement with the technical service.
1.2. Tests and Requirements
1.2.1. Conformance with Regulation No. 13
1.2.1.1. The braking system of the vehicle shall be tested according to the requirements for the
vehicle category in question (M , N or N ) in Regulation No. 13, Annex 4, Paragraphs 1.
and 2. The applicable requirements or tests are:
1.2.1.1.1. Service braking system
1.2.1.1.1.1. Type-0 test with engine disconnected, vehicle laden
1.2.1.1.1.2. Type-0 test with engine connected, vehicle unladen and laden, according to Regulation
No. 13, Annex 4, Paragraphs 1.4.3.1. (stability test) and 1.4.3.2. (only the test with initial
speed v = 0.8 v ).
1.2.1.1.1.3. Type-I test according to Regulation No. 13, Annex 4, Paragraphs 1.5.1. and 1.5.3.
1.2.1.1.1.4. Type-II test
The laden vehicle must be tested in such a manner that the energy input is equivalent to
that recorded in the same period of time with the laden vehicle driven at an average speed
of 30km/h on a 2.5% down-gradient for a distance of 6km with the gear disengaged, the
braking energy being taken by the service brakes alone.
1.2.1.1.2. Secondary Braking System
1.2.1.1.2.1. Type-0 test with engine disconnected, vehicle laden (this test may be omitted if covered by
tests according to Paragraph 1.2.2. of this annex).

1.2.2.2. Speed Sensitivity Test
1.2.2.2.1. Using the pedal force derived from Paragraph 1.2.2.1.2. of this annex and with initial brake
temperature ≤100°C, make three brake applications from each of the following speeds:
40km/h down to 20km/h,
60km/h down to 40km/h and
80km/h down to 60km/h (if v ≥ 90km/h).
1.2.2.2.2. Average the results for each group of three applications and plot speed against
corresponding mean fully developed deceleration.
1.2.2.2.3. Mean fully developed decelerations recorded for the higher speeds shall lie within 25% of
that recorded for the lowest speed.
2. INERTIA DYNAMOMETER TEST
2.1. Test Equipment
For the tests an inertia dynamometer shall be equipped with the vehicle brake in question.
The dynamometer shall be instrumented for continuous recording of rotational speed, brake
torque, pressure in the brake line, number of rotations after brake application, braking time
and brake rotor temperature.
2.1.1. Test Conditions
2.1.1.1. The rotational mass of the dynamometer shall correspond to half the axle portion of 0.55 of
the maximum vehicle mass and the rolling radius of the largest tyre that is authorised for
that vehicle type(s).
2.1.1.2. The initial dynamometer rotational speed shall correspond to the linear vehicle speed as
stated in the paragraphs below and shall be based on the mean of the dynamic rolling radii
of the largest and smallest tyres authorized for that vehicle type(s).
2.1.1.3. Brake lining assemblies or drum brake linings submitted for the test shall be fitted to the
brake and, until a fixed burnishing procedure is established, shall be burnished to the
manufacturer's instructions in agreement with the technical service.
2.1.1.4. If cooling air is used, the speed of the airflow at the brake shall be:
v = 0.33v
Where:
v = vehicle test speed at initiation of braking.
2.1.1.5. The actuation cylinder fitted to the brake must be of the smallest size that is authorized for
that vehicle type(s).

2.2.1.4. Type-II test
2.2.1.4.1. Heating Procedure
The brakes shall be heated by constant braking torque corresponding to a deceleration of
0.15ms at a constant speed of 30km/h during a period of 12 minutes.
2.2.1.4.2. Hot Performance
On completion of the heating procedure the hot performance shall be measured under the
conditions of Paragraph 2.2.1.1. above using the guaranteed line pressure as defined in
Paragraph 2.2.1.1. (the temperature conditions may be different). The mean fully developed
deceleration with the heated brake must not be less than 3.75ms .
2.2.1.5. Static Test for Parking Performance
2.2.1.5.1. For the whole range of applications determine the worst case regarding input force to the
brake, maximum vehicle mass to be braked by one axle, and tyre radius.
2.2.1.5.2. Apply the brake with the input force as determined under Paragraph 2.2.1.5.1. above.
2.2.1.5.3. Put a slowly increasing torque on the dynamometer shaft in order to turn the drum or disc.
Measure the output torque at the brake in the moment the dynamometer shaft begins to
move and calculate corresponding axle braking force using the tyre radius as determined
under Paragraph 2.2.1.5.1.
2.2.1.5.4. The brake force measured under Paragraph 2.2.1.5.3. divided by one-half of the vehicle
mass as determined under Paragraph 2.2.1.5.1. must give at least a quotient of 0.18.
2.2.2. Cold Performance Equivalence Test
A comparison of the cold performance of the replacement brake lining assembly or the
replacement drum brake lining and the original brake lining assembly or the original drum
brake lining shall be made by comparing the results of the Type-0 test as described in
Paragraph 2.2.1.1.
2.2.2.1. The Type-0 test as prescribed in Paragraph 2.2.1.1. shall be performed with one set of the
original brake lining assembly or the original drum brake lining.
2.2.2.2. The replacement brake lining assembly or the replacement drum brake lining shall be
considered to show similar performance characteristics to the original brake lining assembly
or the original drum brake lining if the achieved mean fully developed decelerations at the
same line pressure in the upper two thirds of the generated curve are within 15% of those
obtained with the original brake lining assembly or the original drum brake lining.

ANNEX 5
REQUIREMENTS FOR REPLACEMENT BRAKE LINING ASSEMBLIES FOR
VEHICLES OF CATEGORIES O AND O
1. GENERAL
The test method described in this annex is based on an inertia dynamometer test.
Alternatively the tests may be carried out on a test vehicle or on a rolling road test bench
provided that the same test conditions are achieved and the same parameters measured as
in the inertia dynamometer test.
2. TEST EQUIPMENT
For the tests an inertia dynamometer shall be equipped with the vehicle brake in question.
The dynamometer shall be instrumented for continuous recording of rotational speed, brake
torque, pressure in the brake line or actuation force, number of rotations after brake
application, braking time and brake rotor temperature.
2.1. Test Conditions
2.1.1. The rotational mass of the dynamometer shall correspond to half the relevant axle portion of
the maximum vehicle mass and the rolling radius of the largest tyre that is authorized for that
vehicle type(s).
2.1.2. The initial dynamometer rotational speed shall correspond to the linear vehicle speed as
stated in Paragraph 3.1. of this annex and shall be based on the dynamic rolling radius of the
smallest tyre that is authorized for that vehicle type(s).
2.1.3. Brake linings submitted for the test shall be fitted to the relevant brake and, until a fixed
burnishing procedure is established, shall be burnished to the manufacturer’s instructions in
agreement with the technical service.
2.1.4. If cooling air is used, the speed of the airflow at the brake shall be:
v = 0.33v
Where:
v = vehicle test speed at initiation of braking.
2.1.5. The actuation device fitted to the brake must correspond to the vehicle installation.

ANNEX 6
REQUIREMENTS FOR REPLACEMENT BRAKE LINING ASSEMBLIES AND
DRUM BRAKE LININGS FOR VEHICLES OF CATEGORIES O AND O
1. TEST CONDITIONS
The tests prescribed in this annex may be carried out alternatively on a test vehicle or on an
inertia dynamometer or on a rolling road test bench under the same conditions as mentioned
in Regulation 13, Annex 11, Appendix 2, Paragraphs 3.1. to 3.4.
Brake linings submitted for test shall be fitted to the relevant brakes and, until a fixed
burnishing procedure is established, shall be burnished to the manufacturer’s instructions in
agreement with the technical service.
2. TESTS AND REQUIREMENTS
2.1. Conformance with Regulation No. 13, Annex 11
The brakes shall be tested according to the requirements of Regulation No. 13, Annex 11,
Appendix 2, Paragraph 3.5.
2.1.1. The results shall be reported in a form according to Regulation No. 13, Annex 11, Appendix 3.
2.1.2. A comparison shall be made between these results and those obtained with the original brake
lining assemblies or the original drum brake linings under the same conditions.
2.1.3. The achieved hot performance at the same input torque of the replacement brake lining
assembly or the replacement drum brake lining in the Type-I test or in the Type-III test
(whichever is applicable) must be:
(a)
(b)
Equal to or higher than the hot performance of the original brake lining assembly or the
original drum brake lining, or
At least 90% of the cold performance of the replacement brake lining assembly or the
replacement drum brake lining.
The corresponding stroke of the actuator must not be ≥ 110% of the value achieved with the
original brake lining assembly or the original drum brake lining and must not exceed the value
s as defined in Annex 11, Appendix 2, Paragraph 2. of Regulation No. 13. In the case where
the original brake lining assembly or drum brake lining has been tested against the Type-II
test requirements, the minimum requirements of Regulation No. 13, Annex 4,
Paragraph 1.7.2. (Type-III test) are applicable for the replacement brake lining assembly or
drum brake lining.

ANNEX 7
REQUIREMENTS FOR REPLACEMENT BRAKE LINING ASSEMBLIES
FOR VEHICLES OF CATEGORY L
1. TEST CONDITIONS
1.1. A vehicle which is representative of the type(s) for which the replacement brake lining
assembly approval is required shall be equipped with the brake lining assemblies of the type
for which approval is requested and instrumented for brake testing as required by Regulation
No. 78.
1.2. Brake lining assemblies submitted for the test shall be fitted to the relevant brakes and, until a
fixed burnishing procedure is established, shall be burnished to the manufacturer’s
instructions in agreement with the technical service.
1.3. In the case of brake lining assemblies for vehicles with a combined braking system in the
meaning of Paragraph 2.9. of Regulation No. 78 the combination(s) of brake lining assemblies
for the front and the rear axle to which the approval shall be directed must be tested.
The combination may consist of replacement brake lining assemblies for both axles and/or a
replacement brake lining assembly on one and an original brake lining assembly on the other
axle.
2. TESTS AND REQUIREMENTS
2.1. Conformance with Regulation No. 78
2.1.1. The braking system of the vehicle shall be tested according to the requirements for the
vehicle category in question (L , L , L , L or L ) in Regulation No. 78, Annex 3, Paragraph 1.
The applicable requirements or tests are:
2.1.1.1. Type-0 test with Engine Disconnected
The test is to be carried out only in the laden condition. Make a minimum of six brake
applications at spaced increments of control force or line pressure up to wheel lock, or up to a
deceleration of 6ms or up to the maximum allowed control force.
2.1.1.2. Type-0 test with Engine Connected
Only applicable for vehicles of Categories L , L and L
2.1.1.3. Type-0 test with Wet Brakes
Not applicable to vehicles of Category L or in cases of drum brakes or fully enclosed disc
brakes not subjected to this test during approval to Regulation No. 78.
2.1.1.4. Type-I Test
Only applicable for vehicles of Categories L , L and L
2.1.2. The vehicle must satisfy all the relevant requirements stated in Regulation No. 78, Annex 3,
Paragraph 2. for that category of vehicles.

ANNEX 8
TECHNICAL PRESCRIPTIONS FOR REPLACEMENT BRAKE LINING ASSEMBLIES
INTENDED FOR THE USE IN SEPARATE PARKING BRAKE SYSTEMS BEING
INDEPENDENT OF THE VEHICLE SERVICE BRAKE SYSTEM
1. COMPLIANCE WITH REGULATION NO. 13 OR 13-H
Compliance with the requirements of Regulation No. 13 or 13-H shall be demonstrated in a
vehicle test.
1.1. Vehicle Test
A vehicle which is representative of the type(s) for which the replacement brake lining
assembly approval is required shall be equipped with the replacement brake lining
assemblies of the type for which approval is requested and instrumented for brake testing as
required by Regulation No. 13 or Regulation No. 13-H whichever is appropriate. The vehicle
shall be fully laden. Brake linings submitted for test shall be fitted to the relevant brakes and,
shall not be burnished.
1.2. The parking braking system of the vehicle shall be tested according to all relevant
requirements in Regulation No. 13, Annex 4, Paragraph 2.3. or Regulation No. 13-H,
Annex 3, Paragraph 2.3., whichever is appropriate taking into consideration the original
approval of the system.

2.2. Test Procedure
2.2.1. Sample Preparation
The manufacturer's bedding schedule shall ensure a minimum of 80% surface contact area
for pad assemblies without exceeding a surface temperature of 300°C and 70% surface
contact area for the leading shoe assemblies without exceeding a surface temperature of
200°C.
2.2.2. Test Schedule
The test schedule comprises a number of consecutive braking cycles each containing X
braking intervals of 5s brake applied followed by 10 s brake released.
The following two methods may be used alternatively.
2.2.2.1. Test Schedule with Constant Pressure
2.2.2.1.1. Pad Assemblies
The hydraulic pressure p under the piston(s) of the calliper shall be constant following the
formula:
M
p =
0.57 ⋅ r
⋅ A
M = 150 Nm for A ≤18.1 cm
M = 300 Nm for A > 18.1 cm
A = area of calliper piston(s)
r = effective radius of disc
No of
Cycle
Number of Brake
Applications X
Initial Brake Rotor
Temperature (°C)
Max. Brake Rotor
Temperature (°C)
Forced Cooling
1 1 x 10 ≤60 Open No
2-6 5 x 10 100 Open (350) No
7 1 x 10 100 Open Yes

2.3.2. Shoe Assemblies
2.3.2.1. The mean torque (M ) is the average of the maximum and minimum values of brake torque
recorded during the fifth brake application of cycles one and three.
2.3.2.2. The hot torque (M ) is the minimum brake torque developed during cycles two and four. If
the temperature exceeds 300°C during these cycles the value at 300°C is to be taken as M .
2.4. Acceptance Criteria
2.4.1. With each application for approval of a brake lining assembly type there shall be submitted:
2.4.1.1. For pad assemblies, values for μ , μ , μ .
2.4.1.2. For shoe assemblies, values for M and M .
2.4.2. During production of an approved brake lining assembly type, test samples must demonstrate
compliance with the values registered under Paragraph 2.4.1. of this annex with the following
tolerances:
2.4.2.1. For disc brake pads:
μ ± 15% of registered value;
μ ≥ registered value;
μ ≥ registered value.
2.4.2.2. For simplex drum brake linings:
M ± 20% of registered value;
M ≥ registered value.
3. BRAKE LINING ASSEMBLIES AND DRUM BRAKE LININGS FOR VEHICLES OF
CATEGORIES M , N , N , O , AND O
3.1. Equipment
3.1.1. The machine shall be equipped with a disc brake of the fixed calliper type with a cylinder
diameter of 60mm and a solid (not ventilated) disc having a diameter of 278 ± 2mm and a
thickness of 12mm ± 0.5mm. A rectangular piece of the friction material with an area of
44 cm ± 0.5 cm and a thickness of at least 6mm shall be attached to the backing plate.
3.1.2. The disc rotational speed shall be 660 ± 10 1/min without load and shall not fall below
600 1/min on full load.
3.1.3. The mean contact pressure at the brake lining working surface shall be constant at
75 N/cm ± 10 N/cm .
3.1.4. The test cycles and brake applications during the cycles to be adjustable and automatic.

3.3. Evaluation of Test Results
Friction behaviour is determined from the brake torque noted in selected cycles of the test
schedule. Brake torque shall be translated to coefficient of friction μ.
The μ-value of each brake application shall be determined as the mean value of the 5 s brake
applied.
3.3.1. The operational coefficient of friction μ is the mean value of μ recorded for the brake
applications in cycles 1 and μ is the mean value of μ recorded for the brake applications in
cycle 9.
3.3.2.
The maximum coefficient of friction μ
is the highest value of μ recorded in an application
during cycles 1 to 11 inclusive.
3.3.3.
The minimum coefficient of friction μ
is the lowest value of μ recorded in an application
during cycles 1 to 11 inclusive.
3.4. Acceptance Criteria
3.4.1. With each application for approval of a replacement brake lining assembly type or a
replacement drum brake lining type, there shall be submitted values for μ , μ , μ and
μ .
3.4.2. During production of an approved replacement brake lining assembly type or replacement
drum brake lining type, test samples must demonstrate compliance with the values registered
under Paragraph 3.4.1. of this annex within the following tolerances:
μ , μ ± 15% of the registered value;
μ ≥ registered value;
μ ≤ registered value.

2.5. Acceptance Criteria
With each application for approval of a replacement brake disc or drum there shall be
submitted a production specification covering:
(a)
Chemical composition and its permitted range, or where appropriate, maximum value,
for each element;
(b) Microstructure as per Paragraph 2.2.;
(c)
Mechanical properties as per Paragraph 2.3. and their permitted range, or where
appropriate, minimum value.
During routine production of an approved replacement brake disc or drum production must
demonstrate compliance with these registered specifications.
In the case of Geometric features the values prescribed in Paragraph 5.3.3.1.1. for brake
discs and Paragraph 5.3.3.1.2. for brake drums must not be exceeded.
2.6. Documentation
The documentation shall contain the manufacturer’s maximum and minimum permitted
values.
2.7. Test Frequency
The measurements prescribed in this annex should be carried out for each production batch.

ANNEX 10
ILLUSTRATIONS
1. BRAKE DISC DESIGN TYPES FOR M, N AND O CATEGORIES (EXAMPLES)
Flat Type
Cylinder Type

Double Flange Type
B
D
F
Diameter of mounting bolt holes (or thread size in case of threaded holes)
External diameter of disc
Inner diameter of friction surface (inboard)
F Inner diameter of friction surface (outboard)
H
Mounting flange thickness
L Width of cooling (ventilating) channel
S Disc thickness (nominal)
S Disc thickness (minimal permissible wear thickness)
T
Internal diameter (mounting spigot diameter)
T "x" number of mounting bolt holes and pitch circle diameter
T
Overall length of disc

3. BRAKE DISC DESIGN TYPES FOR L , L , L , L AND L CATEGORIES (EXAMPLES)
One-piece type: brake disc with braking surface and bell made in a single piece and,
therefore, of the same material
Composed fixed type: brake disc having the braking ring made of steel, while the bell is of
other material, generally aluminium; the 2 components are rigidly bounded by a screwed or
riveted connection.
Floating type: brake disc having the braking ring radially released from the bell, in order to
allow its thermal expansion.

ANNEX 11
REQUIREMENTS FOR REPLACEMENT BRAKE DISCS OR BRAKE DRUMS
FOR VEHICLES OF CATEGORIES M AND N
1. TEST OVERVIEW
The tests required in Paragraph 5.3. of this Regulation are detailed as follows according to
the vehicle category:
Table A11/1A
Vehicles of Categories M , N
Performance tests according
to Regulations Nos. 13/13-H
Comparison test with original
part
Integrity tests
Vehicle Test
Alternative Dynamometer Test
2.2.1. Type 0, engine disconnected 3.4.1. Type 0 (simulation engine
disconnected)
2.2.2. Type 0, engine connected 3.4.4. Brake tests simulation
Type 0, engine connected
2.2.3. Type I 3.4.2. Type I
2.3. Parking braking system (if
applicable)
2.4. Testing the dynamic frictional
properties (comparison test
conducted on the individual
axles)
No vehicle test – use dynamometer
test

Speed and load analog to
Item 2.2.2.
3.5. Testing the dynamic
frictional properties
(comparison test
conducted on the
individual wheel brake)
4.1. Brake discs
4.1.1. Brake disc thermal fatigue
test
4.1.2. Brake disc high load test
4.2. Brake drums
4.2.1. Brake drum thermal
fatigue test
4.2.2. Brake drum high load test
For each disc and drum type at least one test group (see definition in Paragraph 5.3.6. of
this Regulation) requires the Type 0 and Type I tests to be carried out on a vehicle (not
applicable for identical and equivalent parts).

2.2. Service Braking System
2.2.1. Type 0 Brake Tests, Engine Disconnected, Vehicle Laden
This test shall be carried out pursuant to Regulation No. 13, Annex 4, Paragraph 1.4.2. or
Regulation No. 13-H, Annex 3, Paragraph 1.4.2.
2.2.2. Type 0 Brake Tests, Engine Connected, Vehicle Unladen and Laden
This test shall be carried out pursuant to Regulation No. 13, Annex 4, Paragraph 1.4.3.
(supplementary test, how the vehicle behaves when braking from high speed) or
Regulation No. 13-H, Annex 3, Paragraph 1.4.3.
2.2.3. Type I Brake Tests
This test shall be carried out pursuant to Regulation No. 13, Annex 4, Paragraph 1.5.1. or
Regulation No. 13-H, Annex 3, Paragraph 1.5.1. At the end of the Type I brake test, the
performance when the brakes are hot is to be satisfied pursuant to Regulation No. 13,
Annex 4, Paragraph 1.5.3. or Regulation No. 13-H, Annex 3, Paragraph 1.5.2.
2.2.4. Type II Brake Tests
This test shall be carried out pursuant to Regulation No. 13, Annex 4, Paragraph 1.6.
2.3. Parking Braking System (if required)
2.3.1. If the service brake system and the parking brake system use a common disc or drum
friction surface, it is not necessary to conduct a specific parking brake system test. The
satisfactory achievement of the Type 0 laden test shall be taken as meeting the parking
brake system requirements.
2.3.2. Static test with 18% gradient, vehicle laden
2.3.3. The vehicle shall satisfy all the relevant provisions laid down in Regulation No. 13, Annex
4, Paragraph 2.3. or Regulation No. 13-H, Annex 3, Paragraph 2.3. that apply to this
category of vehicle.
2.4. Testing the Dynamic Frictional Properties (comparison test conducted on the
individual axles)
For this test, the vehicle shall be laden and all brake applications carried out on a flat road
with the engine disconnected.
The service braking system of the vehicle shall be provided with a device that separates
the front-wheel brakes from the rear-wheel brakes so that they can always be operated
independently of one another.
If an approval or a part report is required in connection with a replacement brake
disc/drum for the front-wheel brakes, the rear-wheel brakes shall remain inoperative
throughout the test.
If an approval or a part report is required in connection with a replacement brake
disc/drum for the rear-wheel brakes, the front-wheel brakes shall remain inoperative
throughout the test.

3. INERTIA DYNAMOMETER TEST
3.1. Equipping the Dynamometer
For testing purposes, the dynamometer shall be fitted out with the original brake caliper or
wheel brake of the vehicle(s) concerned. The inertia dynamometer shall be equipped with
a constant torque device and equipment for recording rotational speed, brake pressure,
the number of revolutions after braking has commenced, brake torque, the braking period
and the temperature of the brake discs/drums on a continuous basis.
3.2. Test Conditions
3.2.1. Inertia Mass of the Inertia Dynamometer
The inertia mass of the inertia dynamometer shall be set as close as possible, with a
permissible variation of ±5%, to the theoretically required value which corresponds to that
part of the total inertia of the vehicle braked by the appropriate wheel. The formula used
for calculation purposes is as follows:
Where:
I = rotary inertia (kgm );
I = m ⋅ r
r = dynamic rolling radius of the tyre (m);
m
= test mass (part of the maximum mass of the vehicle braked by the appropriate
wheel) as stipulated by this Regulation.
3.2.1.1. Dynamic Rolling Radius
In calculating the inertia mass, the dynamic rolling radius (r
authorised for the vehicle (or the axle) shall be taken into account.
) of the largest tyre
3.2.1.2. Test Mass
The test mass for calculating the inertia mass shall be as follows:
a) When testing front axle brake discs and drums:
x ⋅ m
m =
2 ⋅ n
m
n
= max. permitted mass of the vehicle
= number of front axles
b) When testing rear axle brake discs and drums:
y ⋅ m
m =
2 ⋅ n
m
n
= max. permitted mass of the vehicle
= number of rear axles
c) When testing brake discs and drums for vehicles with more than 2 axles:
m = 0.55 m m : maximum technically permitted mass of the axle

3.2.4.2. Drum Brakes
The test is conducted using a new drum with new linings assemblies which have been
type approved according to Regulation No. 13, 13-H or 90 (if applicable, protective grease
removed).
Machining of the linings to achieve good lining to drum contact is permissible.
3.3. Alternative Dynamometer Performance Test
Table A11/3.3
1a. In the case of vehicles of Categories M , M , N
See bedding-in (burnishing) procedure as described in Annex 3,
Paragraph 2.2.2.3.
1b. In the case of vehicles of Categories M , N , N
Bedding-in (burnishing):
100 (disc) or 200 (drum) brake applications
T = 150°C (disc) or 100°C (drum)
v = 60km/h
d = 1 and 2ms² alternating
2. Dynamic friction properties, see Paragraph 3.5.1. of this Annex
3. Brake test Type 0 (simulation engine disconnected), see Paragraph 3.4.1. of this
Annex
4. Brake test Type I, see Paragraph 3.4.2. of this Annex
5. Re-burnishing:
10 (disc) or 20 (drum) brake applications
T = 150°C (disc) or 100°C (drum)
v = 60km/h,
d = 1 and 2ms² alternating
6. Brake test Type 0 (simulation engine disconnected), see Paragraph 3.4.1. of this
Annex
7. Brake test Type 0 (simulation engine connected), see Paragraph 3.4.4. of this
Annex
8. Re-burnishing: (like No. 5.)
9. Dynamic friction properties, see Paragraph 3.5.1 of this Annex
10. Brake test Type II (if applicable), see Paragraph 3.4.3. of this Annex
11. Re-burnishing: (like No. 5.)
Steps 12 to 19 are optional (if activation is not sufficient)
12. Brake test Type 0, see Paragraph 3.4.1. of this Annex

3.4.2. Brake Test Type I
3.4.2.1. Heating Procedure
3.4.2.1.1. According to the vehicle category make consecutive snub applications of the brake in
accordance with the conditions laid down in the following table. Every brake application
shall be conducted in that way that a constant deceleration, including the rolling resistance
(see Paragraph 3.4.1.1. of this Annex) or a constant brake torque equivalent to the
deceleration, including the rolling resistance (see Paragraph 3.4.1.1. of this Annex) of
3ms will be achieved.
The first brake application shall commence at a brake temperature of ≤100°C.
Vehicle Category v [km/h] v [km/h] ∆t [sec] N
M 80% v ≤ 120km/h 0.5 v 45 15
M 80% v ≤ 100km/h 0.5 v 55 15
N 80% v ≤ 120km/h 0.5 v 45 15
M /N /N 80% v ≤ 60km/h 0.5 v 60 20
where:
v
v
= initial speed, at beginning of braking
= speed at end of braking
v = maximum speed of vehicle
n
∆t
= number of brake applications
= duration of a braking cycle: time elapsing between the initiation of one brake
application and the initiation of the next.
3.4.2.1.2. In the case of brakes equipped with automatic brake adjustment devices, the adjustment
of the brakes shall, prior to the Type I test above, be set according to the following
procedures as appropriate:

3.4.2.3. Free Running Test
In the case of brakes equipped with automatic brake adjustment devices, after completing
the tests defined in Paragraph 3.4.2.2. above the brake shall be allowed to cool to a
temperature representative of a cold brake (i.e. ≤100°C) and it shall be verified that the
brake is capable of free running by fulfilling one of the following conditions:
(a)
(b)
The disc or drum is running freely (i.e. may be rotated by hand);
When the disc or drum is rotated at a rotational speed equivalent to a constant
speed of v = 60km/h with the brake released the asymptotic temperatures shall not
exceed a drum/disc temperature increase of 80°C.
3.4.3. Brake Test Type II
3.4.3.1. Heating Procedure
3.4.3.1.1. The brakes shall be heated from an initial temperature of ≤100°C by dragging the brake at
a constant rotational speed equivalent to 30km/h with a constant braking torque
corresponding to a deceleration, excluding rolling resistance, of 0.15ms for a period of 12
minutes.
3.4.3.1.2. In the case of brakes equipped with automatic brake adjustment devices the adjustment of
the brake shall, prior to the Type II test above, be set according to the procedure as laid
down in Paragraph 3.4.2.1.2. of this Annex.
3.4.3.2. Hot Performance
Not later than 60s after completion of the heating procedure the hot performance shall be
measured under the conditions of speed and brake actuating pressure applied in the Type
0 test.
With the heated brake the mean fully developed deceleration, including the rolling
resistance (see Paragraph 3.4.1.1. of this Annex) or the mean brake torque based on the
braking distance equivalent the mean fully developed deceleration, including the rolling
resistance (see Paragraph 3.4.1.1. of this Annex) must not be less than 3.75ms .
3.4.3.3. Free Running Test
See Paragraph 3.4.2.3. of this Annex

3.5.3. The dynamic frictional properties at the end of the procedure (step 9 or 18) of the
replacement brake disc/drum can be regarded as similar to those of the original brake
disc/drum, provided the values attained in relation to the mean fully developed
deceleration at the same operating pressures or control forces in the region of the upper ⅔
of the curve generated do not deviate by either ±8% or ±0.4ms² from those of the original
brake disc/drum.
4. INTEGRITY TESTS USING AN INERTIA DYNAMOMETER
The tests are conducted in accordance with Paragraph 4.1. (discs) or 4.2. (drums).
A single test per test group is required unless the replacement part does not achieve the
required number of cycles before damage or failure (see Paragraph 4.1.1.1.3. or 4.1.1.2.3.
of this annex).
The brake should be installed on the dynamometer in accordance with its fitting position
on the vehicle (rigidly mounted brakes or those installed by means of a stub axle are
exempt).
The temperature of the brake disc/brake drum should be measured in as close proximity to
the friction rubbing surface as possible. The temperature measurement should be
recorded and the method and measuring point shall be the same for all tests.
If cooling air is used during a brake application or between brake applications inside one
braking cycle, the speed of the airflow at the brake shall be limited to v = 0.33 v
Where:
v = vehicle test speed at initiation of braking.
In other cases cooling air is not restricted.
The temperature of the cooling air shall be the ambient temperature.

Where:
v the v to be used to test the replacement part is that corresponding to the vehicle
which has the highest ratio of kinetic energy to disc mass;
t
t
actual braking period during the application;
minimum acceleration time in accordance with the accelerating power of the
respective vehicle;
t rest period;
t Braking interval (t + t + t ).
4.1.1.1.3. Test result (brake disc thermal fatigue test)
The test is regarded as having been passed if 150 or more cycles are completed without
damage or failure.
If less than 150 cycles but more than 100 cycles are completed without damage or failure
then the test must be repeated on a new replacement part.
Under these circumstances both tests must complete more than 100 cycles without
damage or failure for the part to have passed the test.
If less than 100 cycles are completed before damage or failure then a test should be
conducted on the original part and the results compared. If the damage or failure point is
no worse than the number of cycles of the original part -10% then the test is regarded as
having been passed.
Damage in this context means:
(a)
(b)
(c)
(d)
Radial cracks on the friction surface which are longer than ⅔ of the radial height of
the friction surface;
Cracks on the friction surface which reach the inner or outer diameter of the friction
surface;
Through-cracking of any friction ring;
Any type of structural damage or cracks in any area outside the friction surface.
4.1.1.2. Vehicles of Categories M , M , N and N
4.1.1.2.1. Test conditions (brake disc thermal fatigue test)
4.1.1.2.1.1. Vehicles with a maximum permissible mass >7.5 t By means of the following Test
program, brake discs are tested as components of the braking system. It does not imitate
actual driving conditions but is understood as being purely a component test. The
parameters listed below in Table A11/4.1.1.2.1.1. cover the brakes that are presently used
as a rule on vehicles with a maximum permitted mass >7.5 t.

4.1.1.2.2. Test Program (brake disc thermal fatigue test)
"Bedding-in" procedure
Table A11/4.1.1.2.2.
100 brake applications
Initial speed: 60km/h
Final speed: 30km/h
d alternating between 1ms and 2ms
Initial temperature: ≤300°C (beginning at room
temperature)
1. Conditioned braking 10 brake applications from 60 to 30km/h
d alternating between 1ms and 2ms
Initial temperature: ≤250°C
2. High-speed braking 2 Brake applications from 130 to 80km/h
d 3ms
Initial temperature: ≤100°C
3. Conditioned braking See test stage 1
4. High-speed braking See test stage 2
5. Conditioned braking See test stage 1
6. Continuous braking (1) 5 Brake applications at a constant speed of: 85km/h
Decelerating torque corresponding to 0.5ms
Braking period 60 s
Initial temperature: ≤80°C
7. Conditioned braking See test stage 1
8. Continuous braking (2) 5 Brake applications at a constant speed of: 85km/h
Decelerating torque corresponding to 1.0ms
Braking period 40 s
Initial temperature: ≤80°C
9. Repeat test stages 1 to 8: 9 or 14 times (whichever is applicable) − see
Paragraph 4.1.1.2.3.

4.1.2.1.2. Test Program (brake disc high load test)
The new brake linings and the new disc shall be fitted to the relevant brakes and bedded
(burnished) according to the procedure of Annex 3, Paragraph 2.2.2.3. If any new brake
linings are required in order to complete the test, they shall be bedded (burnished)
according to the same procedure:
Test provisions
Vehicle categories
Type of braking
Table A11/4.1.2.1.2.
Number of brake applications 70
Initial temperature at the beginning of braking
Brake torque set to produce a deceleration of
Brake applications
from
to
High load test
M ,/N
Single brake applications
≤100°C
10.0ms with a pressure ≤16,000kPa or p
= 16,000kPa (<10.0ms )
v
10km/h
Where the v to be used to test the replacement part is that corresponding to the vehicle
which has the highest ratio of kinetic energy to disc mass.
4.1.2.1.3. Test Result (brake disc high load test)
The test is regarded as having been passed if 70 or more brake applications are
completed without damage or failure.
If less than 70 brake applications are completed before damage or failure then a test
should be conducted on the original part and the results compared. If the damage or
failure point is no worse than the number of cycles of the original part -10% then the test is
regarded as having been passed.
Damage in this context means:
(a)
(b)
(c)
(d)
Radial cracks on the friction surface which are longer than ⅔ of the radial height of
the friction surface;
Cracks on the friction surface which reach the inner or outer diameter of the friction
surface;
Through-cracking of any friction ring;
Any type of structural damage or cracks in any area outside the friction surface.

4.2. Brake Drums
4.2.1. Brake Drum Thermal Fatigue Test
The test is conducted using a new drum with new linings assemblies which have been
type approved according to Regulations No. 13, 13-H or 90 (if applicable, protective
grease removed).
Machining of the linings to achieve good lining to drum contact is permissible.
4.2.1.1. Vehicles of Categories M and N
4.2.1.1.1. Test Conditions (brake drum thermal fatigue test)
The inertia mass of the inertia dynamometer shall be determined in accordance with the
requirements laid down in Paragraphs 3.2.1., 3.2.1.1. and 3.2.1.2. of Annex 11.
The rotational speed of the dynamometer shall correspond to the linear test speed of the
vehicle based on the mean of the largest and smallest dynamic rolling radius of the tyres
authorized for that vehicle.
4.2.1.1.2. Test Program (brake drum thermal fatigue test)
The thermal fatigue requirements for brake drums are covered by the high load tests of
Paragraph 4.2.2.1.2.
4.2.1.1.3. Test result (brake drum thermal fatigue)
See Paragraph 4.2.2.1.3.

4.2.1.2.2. Test Program (brake drum thermal fatigue test)
Table A11/4.2.1.2.2.
Test provision
"Bedding in" procedure
Thermal fatigue test
200 brake applications
Initial speed: 60km/h
Final speed: 5km/h
d alternating between 1ms and 2ms
Initial temperature : ≤200°C (beginning at
room temperature)
Type of braking
Number of brake applications
Brake torque set to produce a deceleration
of
Brake applications
Alternatively bedding may be omitted if the
applicant for approval does not consider it
to be necessary
Sequential brake applications
250 or 300 (whichever is applicable) − see
Paragraph 4.2.1.2.3.
NB: The test is interrupted when a through
crack appears.
3.0ms²
from 130
to
Initial temperature of each brake application
Cooling pursuant to Paragraph 3.2.3
80km/h
≤50°C
Permitted

4.2.2.1.2. Test Program (brake drum high load test)
This test covers also the requirements of the thermal fatigue test (see
Paragraph 4.2.1.1.2.)
The test has to be carried out according to the following table:
"Bedding-in" procedure
Test provision
Type of braking
Table A11/4.2.2.1.2.
Number of brake applications 100
Initial temperature at the beginning of
braking
Brake torque set to produce a deceleration
of
Brake applications
from
to
Where the v
Make 100 consecutive snub applications with
v = 80km/h and v = 10km/h and an initial
temperature of ≤100°C.
The deceleration of the first application shall
be constant 1.5ms . From the second up to
the last application the pressure shall be
constant and equivalent to the average of the
first application.
The bedding should be continued until a
minimum of 80% lining to drum contact is
achieved.
Brake drum high load test
Single brake applications
≤100°C
10.0ms² with a pressure ≤16,000kPa or
p = 16,000kPa (<10.0ms )
v
10km/h

4.2.2.2.2. Test program (brake drum high load test)
Test provision
"Bedding in" procedure
Table A11/4.2.2.2.2.
Total number of brake applications 150
Initial brake drum temperature at each brake application
Brake applications
from
to
Brake torque set to produce a deceleration of
Cooling (also deviating from Paragraph 3.2.3. of this
Annex)
4.2.2.2.3. Test Result (brake drum high load test)
High load test
200 brake applications
Initial speed: 60km/h
Final speed: 5km/h
d alternating between 1ms
and 2ms
Initial temperature: ≤200°C
(beginning at room
temperature)
Alternatively bedding may be
omitted if the applicant for
approval does not consider it
to be necessary
≤100°C
60km/h
≤5km/h
6ms²
permitted
The test result is positive provided the brake drum does not fracture.
The test shall be considered valid provided the required maximum torque is achieved for
at least 90% of the brake applications under the condition that for the other 10% the
maximum pressure is applied.
Damage in this context means:
(a)
(b)
(c)
(d)
Radial cracks on the friction surface which are longer than ⅔ of the radial height of
the friction surface;
Cracks on the friction surface which reach the inner or outer diameter of the friction
surface;
Through-cracking of any friction ring;
Any type of structural damage or cracks in any area outside the friction surface.

2. VERIFICATION OF THE VEHICLE TEST REQUIREMENTS
2.1. Test Vehicle
A vehicle that is representative for the selected test group (see definition in
Paragraph 5.3.6. of this Regulation) in respect of which an approval or parts report for a
replacement brake disc/drum is applied for shall be fitted with this replacement brake
disc/drum as well as be equipped with test devices for testing the brakes pursuant to the
provisions of Regulation No. 13.
The replacement brake disc/drum shall be fitted to the axle in question together with an
accompanying brake lining which has been type approved according to Regulations No.
13, or 90 available from the vehicle or axle manufacturer. Unless a uniform procedure is
laid down for how braking is to be effected, the test shall be carried out following
agreement with the Technical Service. All the tests listed below shall be carried out on
brakes that have been bedded in. The same "bedding-in" programme shall be used for
both replacement and original brake discs and drums.
2.2. Service Braking System
2.2.1. Type 0 Brake Tests, Vehicle Laden
This test shall be carried out pursuant to Regulation No. 13, Annex 4, Paragraph 1.4.4.
2.2.2. Type I Brake Tests
This test shall be carried out pursuant to Regulation No. 13, Annex 4, Paragraph 1.5.2.
At the end of the Type I brake test, the performance when the brakes are hot is to be
satisfied pursuant to Regulation No. 13, Annex 4, Paragraph 1.5.3.
2.2.3. Type III Brake Tests
This test shall be carried out pursuant to Regulation No. 13, Annex 4, Paragraph 1.7.
2.3. Parking Braking System (if applicable)
2.3.1. If the service brake system and the parking brake system use a common disc or drum
friction surface, it is not necessary to conduct a specific parking brake system test. The
satisfactory achievement of the Type 0 laden test shall be taken as meeting the parking
brake system requirements.
2.3.2. Static test with 18% gradient, vehicle laden
2.3.3. The vehicle shall satisfy all the relevant provisions laid down in Regulation No. 13,
Annex 4, Paragraphs 2.3. and 3.2. that apply to this category of vehicle.

3.2. Test Conditions
3.2.1. Inertia Mass of the Inertia Dynamometer
The inertia mass of the inertia dynamometer shall be set as close as possible, with a
permissible variation of ±5%, to the theoretically required value which corresponds to that
part of the total inertia of the vehicle braked by the appropriate wheel. The formula used
for calculation purposes is as follows:
I = m ⋅ r
Where:
I = rotary inertia (kgm );
r = dynamic rolling radius of the tyre (m);
m
= test mass (part of the maximum mass of the vehicle braked by the appropriate
wheel) as stipulated by this Regulation.
3.2.1.1. Dynamic Rolling Radius
In calculating the inertia mass, the dynamic rolling radius (r
authorised for the vehicle (or the axle) shall be taken into account.
) of the largest tyre
3.2.1.2. Test Mass
The test mass for calculating the inertia mass shall be as follows:
m = 0.55 m m : maximum technically permitted mass of the axle
3.2.2. The initial rotational speed of the dynamometer shall correspond to the linear speed of the
vehicle at 40 or 60km/h (depending on the type of test) based on the mean of the dynamic
rolling radii of the largest and smallest tyre of the authorised tyre sizes.
3.2.3. Cooling
The cooling may be carried out either to Paragraphs 3.2.3.1. or 3.2.3.2.

3.3. Alternative Dynamometer Performance Test
1. Cold Bedding-in (cold burnishing):
Table A12/3.3.
100 (disc) or 200 (drum) brake applications
T = 150°C (disc) or 100°C (drum)
v = 60km/h
d = 1 and 2ms² alternating
2. Dynamic friction properties, see Paragraph 3.5.1. of this Annex
3. Hot Bedding-in (Hot burnishing):
Make 30 consecutive snub applications with v = 60km/h and v = 30km/h with a
cycle time of 60 s starting at a brake temperature of ≤100°C at the first application.
The deceleration of the first application shall be constant 3ms . From the second
up to the last application the pressure shall be constant and equivalent to the
average of the first application.
4. Re-burnishing:
30 brake applications
T = 150°C (disc) or 100°C (drum)
v = 60km/h,
d = 1 and 2ms² alternating
5. Brake test Type 0, see Paragraph 3.4.1. of this Annex
6. Brake test Type I (in the case of O /O ), see Paragraph 3.4.2. of this Annex
7. Re-burnishing: (like Item 4.)
8. Brake test Type 0, see Paragraph 3.4.1. of this Annex
9. Brake test Type III ((in the case of O ), see Paragraph 3.4.3. of this Annex
10. Re-burnishing: (like Item 4.)

3.4.2.3. Free Running Test
In the case of brakes equipped with automatic brake adjustment devices, after completing
the tests defined in Paragraph 3.4.2.2. the brake shall be allowed to cool to a temperature
representative of a cold brake (i.e. ≤100°C) and it shall be verified that the brake is
capable of free running by fulfilling one of the following conditions:
(a)
The disc or drum is running freely (i.e. may be rotated by hand);
(b) When the disc or drum is rotated without any cooling at a rotational speed
equivalent to a constant speed of v = 60km/h with the brake released the asymptotic
temperatures shall not exceed a drum/disc temperature increase of 80°C.
3.4.3. Type III Test (Fade Test for Vehicles of Category O )
3.4.3.1. Heating Procedure
3.4.3.1.1. Make consecutive snub applications of the brake in accordance with the conditions laid
down in the table. The first brake application should commence at a brake temperature of
≤100°C and be conducted in such a way that a constant deceleration, including the rolling
resistance (see Paragraph 3.4.1.1. of this Annex) or a constant brake torque equivalent to
the deceleration, including the rolling resistance (see Paragraph 3.4.1.1. of this Annex) of
3ms will be achieved. The mean value of brake actuating pressure used for the first
brake application should be maintained for all succeeding brake applications for the
remainder of the test.
Conditions
Category of vehicles
v [km/h]
v [km/h]
∆t [sec]
n
O
60
1/2 v
60
20
where:
v
v
n
= initial speed, at beginning of braking
= speed at end of braking
= number of brake applications
∆t = duration of a braking cycle: time elapsing between the initiation of one brake
application and the initiation of the next

3.5.3. The dynamic frictional properties at step 2 of the procedure of the replacement brake
disc/drum can be regarded as similar to those of the original brake disc/drum, provided the
values attained in relation to the mean fully developed deceleration at the same operating
pressures or control forces in the region of the upper ⅔ of the curve generated do not
deviate by more than ±8% or ±0.4ms² from those of the original brake disc/drum.
4. INTEGRITY TESTS USING AN INERTIA DYNAMOMETER
The tests are conducted in accordance with Paragraph 4.1. (discs) or 4.2. (drums).
A single test per test group is required unless the replacement part does not achieve the
required number of cycles before damage or failure (see Paragraph 4.1.1.1.3. or 4.1.1.2.3.
of this annex).
The brake should be installed on the dynamometer in accordance with its fitting position
on the vehicle (rigidly mounted brakes or those installed by means of a stub axle are
exempt).
The temperature of the brake disc/brake drum should be measured in as close proximity to
the friction rubbing surface as possible. The temperature measurement should be
recorded and the method and measuring point shall be the same for all tests.
If cooling air is used during a brake application or between brake applications inside one
braking cycle, the speed of the airflow at the brake shall be limited to:
v = 0.33 v
Where:
4.1. Brake Discs
v = vehicle test speed at initiation of braking.
In other cases cooling air is not restricted.
The temperature of the cooling air shall be the ambient temperature.
4.1.1. Brake Disc Thermal Fatigue Test
This test is conducted using a new disc with new brake lining assemblies which have been
type approved according to Regulation No. 13 or 90 (in the condition as mounted on the
vehicle, e.g. protective grease removed).
4.1.1.1. Vehicles of Categories O and O
4.1.1.1.1. Test Conditions (brake disc thermal fatigue)
The inertia mass of the inertia dynamometer shall be determined in accordance with the
requirements laid down in Paragraphs 3.2.1., 3.2.1.1. and 3.2.1.2. of Annex 12.
The rotational speed of the dynamometer shall correspond to the linear test speed of the
vehicle based on the mean of the largest and smallest dynamic rolling radius of the tyres
authorized for that vehicle.

4.1.1.1.3. Test Result (brake disc thermal fatigue test)
The test is regarded as having been passed if 150 or more cycles are completed without
damage or failure.
If less than 150 cycles but more than 100 cycles are completed without damage or failure
then the test must be repeated on a new replacement part. Under these circumstances
both tests must complete more than 100 cycles without damage or failure for the part to
have passed the test.
If less than 100 cycles are completed before damage or failure then a test should be
conducted on the original part and the results compared. If the damage or failure point is
no worse than the number of cycles of the original part -10% then the test is regarded as
having been passed.
Damage in this context means:
(a)
(b)
(c)
(d)
Radial cracks on the friction surface which are longer than ⅔ of the radial height of
the friction surface;
Cracks on the friction surface which reach the inner or outer diameter of the friction
surface;
Through-cracking of any friction ring;
Any type of structural damage or cracks in any area outside the friction surface.
4.1.1.2. Vehicles of Categories O and O
4.1.1.2.1. Test Conditions (brake disc thermal fatigue test)

4.1.1.2.2. Test Program (brake disc thermal fatigue test)
"Bedding-in" procedure
Table A12/4.1.1.2.2.
100 brake applications
Initial speed: 60km/h
Final speed: 30km/h
d alternating between 1ms and 2ms
Initial temperature: ≤300°C (beginning at room temperature)
1. Conditioned braking 10 brake applications from 60 to 30km/h
d alternating between 1ms and 2ms
Initial temperature: ≤250°C
2. High-speed braking 2 Brake applications from 130 to 80km/h
d 3ms
Initial temperature: ≤100°C
3. Conditioned braking See test stage 1
4. High-speed braking See test stage 2
5. Conditioned braking See test stage 1
6. Continuous braking (1) 5 Brake applications at a constant speed of: 85km/h
Decelerating torque corresponding to 0.5ms
Braking period 60 s
Initial temperature: ≤80°C
7. Conditioned braking See test stage 1
8. Continuous braking (2) 5 Brake applications at a constant speed of: 85km/h
Decelerating torque corresponding to 1.0ms
Braking period 40 s
Initial temperature: ≤80°C
9. Repeat test stages 1 to
8:
9 or 14 times (whichever is applicable) − see
Paragraph 4.1.1.2.3.

4.1.2.1.1. Test Conditions (brake disc high load test)
See Paragraph 4.1.1.1.1. above.
4.1.2.1.2. Test program (brake disc high load test)
The test has to be carried out according to the following table:
Test provision
Vehicle categories
Type of braking
Table A12/4.1.2.1.2
Number of brake applications 70
Initial temperature at the beginning of
braking
Brake torque set to produce a deceleration
of
High load test
O ,/O
Single brake applications
≤100°C
10.0ms with a pressure ≤16,000kPa or p =
16,000kPa (<10.0ms )
Brake applications
from
to
80
10km/h
4.1.2.1.3. Test Result (brake disc high load test)
The test is regarded as having been passed if 70 or more brake applications are
completed without damage or failure.
If less than 70 brake applications are completed before damage or failure, then a test
should be conducted on the original part and the results compared. If the damage or
failure point is no worse than the number of cycles of the original part -10% then the test is
regarded as having been passed.
Damage in this context means:
(a)
(b)
(c)
(d)
Radial cracks on the friction surfaces which are longer than two thirds of the radial
height of the friction surface;
Cracks on the friction surface which reach the inner or outer diameter of the friction
surface;
Through-cracking of any friction ring;
Any type of structural damage or cracks in any area outside the friction surface.

4.2.1.1.1.2. Vehicles with a maximum permissible axle load >1,200 kg
The inertia mass of the inertia dynamometer shall be determined in accordance with the
requirements laid down in Paragraphs 3.2.1., 3.2.1.1. and 3.2.1.2. of Annex 12.
The rotational speed of the dynamometer shall correspond to the linear test speed of the
vehicle based on the mean of the largest and smallest dynamic rolling radius of the tyres
authorized for that vehicle.
4.2.1.1.2. Test Program (brake drum thermal fatigue test)
Test provision
"Bedding in" procedure
Type of braking
Number of brake applications
Table A12/4.2.1.1.2.
Brake torque set to produce a deceleration
of
Brake applications
Thermal fatigue test
200 brake applications
Initial speed: 60km/h
Final speed: 5km/h
d alternating between 1ms and 2ms
Initial temperature : ≤200°C (beginning at
room temperature)
Alternatively bedding may be omitted if the
applicant for approval does not consider it
to be necessary
Sequential brake applications
250 or 300 (whichever is applicable) − see
Paragraph 4.2.1.1.3.
NB: The test is interrupted when a through
crack appears.
3.0ms²
from 130
to
Initial temperature of each brake application
Cooling pursuant to Paragraph 3.2.3.
80km/h
≤50°C
Permitted

Inner Drum
Diameter
[mm]
Test Mass
[kg]
Table A12/4.2.1.2.1.1.
Lining Width
<130mm 130-190mm >190mm
Tyre
Radius
[m]
Test Mass
[kg]
Tyre
Radius
[m]
Test Mass
[kg]
Tyre
Radius
[m]
Typical Rim
Diameter
<330 2 750 0.402 3 200 0.390 5 500 0.402 17.5"
330-390 3 400 0.480 5 500 0.516 19.5"
391-430 3 400 0.510 4 500 0.527 5 500 0.543 22.5"
>430 –
The inertia mass of the inertia dynamometer shall be determined in accordance with the
requirements laid down in Paragraph 3.2.1. of Annex 12 in conjunction with the
parameters specified in the table above (test mass and r ).
The rotational speed of the dynamometer shall correspond to the linear test speed of the
vehicle based on the dynamic tyre rolling radii specified in Table A12/4.2.1.2.1.1.
4.2.1.2.1.2. Vehicles with a maximum permissible mass >3.5 t and ≤7.5 t As regards vehicles with a
maximum permitted mass >3.5 t and ≤7.5 t in respect of which the parameters listed in
Table A12/4.1.1.2.1.1. do not apply, the test parameters shall be selected in such a way
that the worst case scenario that formed the basis of the range of use of the replacement
brake drum (maximum permitted vehicle mass, maximum tyre equipment size) is covered.
The inertia mass of the inertia dynamometer shall be determined in accordance with the
requirements laid down Paragraphs 3.2.1., 3.2.1.1. and 3.2.1.2. of Annex 12.
The rotational speed of the dynamometer shall correspond to the linear test speed of the
vehicle based on the mean of the largest and smallest dynamic rolling radius of the tyres
authorized for that vehicle.

4.2.2. Brake Drum High Load Test
In the case of interchangeable parts, the high load test shall be conducted on a new brake
drum or on the same brake drum which has been used for the alternative dynamometer
test (see Paragraph 3.3. of this Annex.). In either case, the brake lining assemblies used
for the test should be approved according to Regulations No. 13 or 90 and bedded to the
drum in accordance with the procedure specified in Paragraph 4.2.2.2.2. of this Annex.
Alternatively bedding may be omitted if the applicant for approval does not consider this to
be necessary
In the case of equivalent parts, the high load test shall be conducted using a new drum, an
original brake of the vehicle(s) concerned and new brake lining assemblies of the
vehicle(s) concerned which have been type approved according to Regulations Nos. 13 or
90 (in the condition as mounted on the vehicle, e.g. protective grease removed). Bedding
should be in accordance with the procedure specified in Paragraph 4.2.2.2.2. of this
Annex. Alternatively bedding may be omitted if the applicant for approval does not
consider this to be necessary Worn brake linings may be replaced during the test if
necessary.
4.2.2.1. Vehicles of Categories O and O
4.2.2.1.1. Test Conditions (brake drum high load test)
The inertia mass of the inertia dynamometer shall be determined in accordance with the
requirements laid down in Paragraphs 3.2.1., 3.2.1.1. and 3.2.1.2. of Annex 12.
The rotational speed of the dynamometer shall correspond to the linear test speed of the
vehicle based on the mean of the largest and smallest dynamic rolling radius of the tyres
authorized for that vehicle.
4.2.2.1.2. Test Program (brake drum high load test)
See Paragraph 4.2.2.2.2. below.
4.2.2.1.3. Test Result (brake drum high load test)
See Paragraph 4.2.2.2.3. below.
4.2.2.2. Vehicles of Categories O and O
4.2.2.2.1. Test conditions (brake drum high load test)
See Paragraph 4.2.1.2.1. above.

ANNEX 13
MODEL TEST REPORT FOR A REPLACEMENT BRAKE DISC/DRUM
Test Report No. … concerning the approval of a replacement brake disc/drum
in accordance to Regulation No. 90
1. General technical description of a replacement brake disc/drum
1.1. Applicant (name and address): .....................................................................................................
1.2. Manufacturer (name and address): ..............................................................................................
1.3. Trade name: .................................................................................................................................
1.4. Category of replacement disc/drum: Original/Identical/Equivalent/Interchangeable .................
1.5. Type of disc/drum : .....................................................................................................................
1.6. Marking:
Manufacturer name or
trade name:
Approval number E2-90R02 Cxxxx/yyyy
Part number
1.7. Material
Indication for traceability
Minimum thickness
(disc)/maximum inside
diameter (drum)
Identification Location of Marking Method of Marking
xxxx => Type No.
yyyy => Variant No.
1.7.1. Material group: ..............................................................................................................................
1.7.2. Material subgroup .....................................................................................................................

2. Test Groups
2.1. Dimensions per test group
2.1.1. Outside (disc)/Inside (drum) diameters: ....................................................................................
2.1.2. Thickness (disc)/Shoe width (drum) diameters: ........................................................................
2.2. Highest ratio of kinetic energy per test group in according to Paragraph 5.3.6. of Regulation
No. 90

Max ⎜

m
E

⎟ = KKKKKKKKKKKK

2.3.
Disc/drum
material per test group: ............................................................................................
3.
Technical data regarding the tests per test group
3.1.
Vehicle test
3.1.1.
Data of the test vehicle
3.1.1.1.
Vehicle category: ..........................................................................................................................
3.1.1.2.
Vehicle manufacturer: ...................................................................................................................
3.1.1.3.
Vehicle make: ...............................................................................................................................
3.1.1.4.
Vehicle type and trade name: .......................................................................................................
3.1.1.5.
Vehicle identification number: .......................................................................................................
3.1.1.6.
Vehicle type approval No.: ............................................................................................................
3.1.1.7.
Vehicle engine power: ..................................................................................................................
3.1.1.8.
Speed:
Maximum vehicle speed v
:.......................................................................................................
3.1.1.9.
Tyres: ............................................................................................................................................
3.1.1.10.
Brake circuit configuration/Layout: ...............................................................................................
3.1.1.11.
Test masses
Axle 1: ...........................................................................................................................................
Axle 2: ...........................................................................................................................................
Axle…: ..........................................................................................................................................

3.1.1.12.3. Brake pad/Brake lining
Manufacturer: ................................................................................................................................
Make: ............................................................................................................................................
Type: .............................................................................................................................................
Approval number
: ......................................................................................................................
Identification (e.g. part number): ...................................................................................................
Effective surface area:
3.1.2.
Test equipment
3.1.2.1.
Deceleration: .................................................................................................................................
3.1.2.2.
Pressure: ......................................................................................................................................
3.1.2.3.
Speed: ..........................................................................................................................................
3.1.2.4.
Drum/Disc temperature: ...............................................................................................................
3.1.3.
Test track:
3.1.3.1.
Location: .......................................................................................................................................
3.1.3.2.
Surface: ........................................................................................................................................
3.1.3.3.
Condition (e.g. dry/wet): ...............................................................................................................
3.2.
Dynamometer test
3.2.1.
Test data
3.2.1.1.
Vehicle category: ..........................................................................................................................
3.2.1.2.
Dynamic rolling radius
Dynamic rolling radius R
for calculating the inertia:
with respect to Paragraph 3.2.1 of Annex 11/12 ..........................................................................
Dynamic rolling radius R
with respect to Paragraph 3.2.2 of Annex 11/12: ..

3.2.1.7.2. Brake calliper/Brake drum mechanism
Manufacturer: ................................................................................................................................
Type: .............................................................................................................................................
Variant: ........................................................................................................................................
Method of construction: ................................................................................................................
Maximum technical permissible torque C at the brake lever (pneumatic)/Line pressure
(p ) (hydraulic) : ....................................................................................................................
Threshold torque C (pneumatic)/Line pressure (hydraulic) : ...................................................
Ratio l /e (pneumatic)/Piston diameter (hydraulic) ……/..…. ....................................................
Maximum Brake torque: ...............................................................................................................
Identification-No.: ..........................................................................................................................
3.2.1.7.3. Brake pad/Brake Lining
Manufacturer: ................................................................................................................................
Make: ............................................................................................................................................
Type: .............................................................................................................................................
Approval number : ......................................................................................................................
Identification: .................................................................................................................................
Width b : .......................................................................................................................................
Thickness d : ................................................................................................................................
Surface, effective: .........................................................................................................................
Method of attachment: ..................................................................................................................
3.2.2. Test bench data: ..........................................................................................................................
3.2.2.1. Location: ......................................................................................................................................

4.5.1.1.1. Vehicle test results:
Test Type: 0
disconnected

4.5.1.2.1. Vehicle test results:
Test Type: 0
disconnected

4.5.1.3. Service brake performance in the case of Categories O , O , and O with pneumatic
braking system
Test type: 0 I
No. Sample
Annex 12, Paragraph: 2.2.1./3.4.1. 2.2.2./3.4.4.
Test speed
Brake chamber pressure P kPa
Number of applications –
Duration of one brake cycle s
Brake force 0.5 · T daN
Braking ratio 0.5 · T /9.81 · m –
(m = Test mass)
Brake chamber stroke s mm
Threshold torque at the brake lever
C
Nm
C Nm
Free running: ...........................................................................................................................

4.5.1.3.2. Inertia dynamometer test results:
Test type: 0 I
Annex 12, Paragraph: 3.4.1. 3.4.2.
Load condition: laden laden
Test speed
Initial: km/h
Final: km/h
Brake chamber pressure p kPa
Deceleration: m/s
Number of applications: –
Duration of one brake cycle: s
Brake force 0.5 · T daN
Braking ratio 0.5 · T /9.81 · m –
(m = Test mass)
Brake chamber stroke s mm
Threshold torque at the brake lever
C
Nm
C Nm
Free running test passed: yes / no

4.6.2. High load test:
Cycles without damage in accordance with
Annex 11: Paragraphs 4.1.2.1.3./4.1.2.2.3./4.2.2.1.3./4.2.2.2.3.
Sample No. Annex 12: Paragraphs 4.1.2.1.3./4.1.2.2.3./4.2.2.1.3./4.2.2.2.3.
5. Test Documents
6. Appendices
Appendix: ................................................................................................................................
7. Date(s) of Test: ........................................................................................................................
7.1. Date(s) of vehicle test : .........................................................................................................
7.2. Date(s) of Inertia dynamometer test: ......................................................................................
8. This test has been carried out and the results reported in accordance with Regulation No.
90 as last amended by the 03 series of amendments.
Technical Service conducting the test
Signed: .......................... Date: ...................................

2.2. Test Procedure and Conditions
Static test performed on special test bench shown in Figure 1.
Figure 1
2.2.1. Drill a hole on the braking surface of the disc at a distance from the centre equal to the
effective radius Rd.
2.2.2. Position the disc on the test bench and fasten it using specific fastening screws.
2.2.3. Connect the bench arm to the hole drilled on the brake disc.
2.2.4. Apply the force F, specified in Table A14/2.2.5., as shown in Figure1.
2.2.5. Record strokes and forces as shown in Figure 2.
Table A14/2.2.5.
Disc Diameter
[mm]
≥ 150 < 200
≥ 200 < 250
≥ 250 < 300
≥ 300 < 350
Disc Thickness
[mm]
Tangential force F
[kN] min
≤ 4 ≥ 8
> 4 ≥ 10
≤ 3 ≥ 8
>3 ≤ 4 ≥ 10
> 4 ≥ 12
≤ 3 ≥ 8
> 3 ≤ 4 ≥ 10
> 4 ≥ 12
≤ 4 ≥ 8
> 4 ≤ 5 ≥ 11
> 5 ≥ 14

2.3. Test Results
The disc shall not permanent deformations before reaching the force F specified in
Table A14/2.2.5; the measurement of the deformation force must be performed at
Point A as in Figure 2.
3. VERIFICATION OF THE VEHICLE TEST REQUIREMENTS
3.1. Test Vehicle
A vehicle that is representative for the selected test group (see definition in
Paragraph 5.3.6. of this Regulation) in respect of which an approval or parts report for a
replacement brake disc is applied for shall be fitted with this replacement brake disc as
well as be equipped with test devices for testing the brakes pursuant to the provisions of
Regulation No. 78.
The replacement brake disc shall be fitted to the wheel in question together
with an accompanying brake lining which has been type approved according to
Regulations Nos. 78 or 90, available from the vehicle.
Unless a uniform procedure is laid down for how braking is to effected, the test shall be
carried out following agreement with the Technical Service. All the tests listed below
shall be carried out on brakes that have been bedded in.
The same "bedding-in" programme shall be used for both replacement and original brake
discs.
3.2. Service Braking System
3.2.1. Brake Temperature Measurement
This procedure shall be carried out pursuant to Regulation No.78, Annex 3,
Paragraph 2.4.
3.2.2. Burnishing Procedure
3.2.3. Dry Stop Test
This procedure shall be carried out pursuant to Regulation No.78, Annex 3,
Paragraph 2.5.
3.2.4. Wet Brake Test
3.2.5. Heat Fade Test
This test shall be carried out pursuant to Regulation No. 78, Annex 3, Paragraph 3.
This test shall be carried out pursuant to Regulation No. 78, Annex 3, Paragraph 6.
The test is applicable to Vehicle Categories L , L and L .
This test shall be carried out pursuant to Regulation No. 78, Annex 3, Paragraph 7.

Figure 3
Figure 4

Vehicle Category
X values (front wheel with
1 disc)
Table A14/4.2.1.2.
Percentage by mass m to be taken into account
X values (front wheel with
2 discs)
Y values (rear axle)
L , L , L , L , L 75 37.5 50
4.2.2. The initial rotational speed of the dynamometer shall correspond to the linear speed of
the vehicle at 80km/h (L , L , L ) or 40km/h (L , L ) based on the mean of the dynamic
rolling radii of the largest and smallest tyre of the authorised tyre sizes.
4.2.3. Cooling
The cooling may be carried out according to the test requirements specified in the
following Tables A14.
4.2.4. Preparation of the Brake
4.2.4.1. Disc brakes
The test is conducted using a new disc with new brake lining assemblies which have
been type approved according to Regulation Nos. 78 or 90 (in the condition as mounted
on the vehicle).
4.3. Alternative Dynamometer Performance Test
4.3.1. Burnishing
According to Table A14/5.1.3.1.1.
4.4. Service Braking System
4.4.1. Dry Stop Test
4.4.2. Heat Fade Test
This test shall be carried out pursuant to Regulation No. 78, Annex 3, Paragraph 3.
This test is applicable to Vehicle Categories L , L and L .
This test shall be carried out pursuant to Regulation No. 78, Annex 3, Paragraph 7.

5. INTEGRITY TEST USING AN INERTIA DYNAMOMETER
The tests are conducted in accordance with Paragraph 5.1. (discs).
A single test per test group is required unless the replacement part does not achieve the
required number of cycles before damage or failure (see Paragraph 5.1.1.1.3. or
5.1.1.2.3. of this Annex).
The brake should be installed on the dynamometer in accordance with its fitting position
on the vehicle (rigidly mounted brake or this installed by means of a stub axle are
exempt).
The temperature of the brake disc should be measured in as close proximity to the
friction rubbing surface as possible. The temperature measurement should be recorded
and the method and measuring point shall be the same for all tests.
If cooling air is used during a brake application or between brake applications inside one
braking cycle, the speed of the airflow at the brake shall be limited to v = 0.33 v
Where:
v = vehicle test speed at initiation of braking.
In other cases cooling air is not restricted.
The temperature of the cooling air shall be the ambient temperature.
5.1. Brake Disc Thermal Fatigue Test
This test is conducted using a new disc, an original brake caliper of the vehicle(s)
concerned and new brake lining assemblies of the vehicle(s) concerned which have
been type approved according to Regulations Nos. 78 or 90 (in the condition as mounted
on the vehicle).
Worn brake linings may be replaced during the test if necessary.
5.1.1. This test is applicable to Vehicle Categories L , L and L .
5.1.2. Test Conditions
The inertia mass of the inertia dynamometer shall be determined in accordance with the
requirements laid down in Paragraphs 4.2.1., 4.2.1.1. and 4.2.1.2. of Annex 14.
The rotational speed of the dynamometer shall correspond to the linear test speed of the
vehicle based on the mean of the largest and smallest dynamic rolling radius of the tyres
authorized for that vehicle.

5.1.4. Rear Disc
5.1.4.1. Test program
5.1.4.1.1. Burnishing
According to Table A14/5.1.4.1.1.
Table A14/5.1.4.1.1.
5.1.4.1.2. Fade Test
According to Table A14/5.1.4.1.2.
Table A14/5.1.4.1.2.

5.1.5. Test Result (Brake Disc Thermal Fatigue Test)
The test is regarded as having been passed if the cycles prescribed in:
(a)
(b)
Tables A14/5.1.3.1.1. – 5.1.3.1.2. for front discs
Tables A14/5.1.4.1.1. – 5.1.4.1.2. - 5.1.4.1.3. for rear discs are completed without
damage or failure.
If less than 20 cycles, according to "Thermomechanical Fatigue test" in
Tables A14/5.1.3.1.2. and A14/5.1.4.1.3., but more than 15 are completed without
damage or failure, then the test must be repeated on a new replacement part.
Under these circumstances both tests must complete more than 15 cycles without
damage or failure for the part to have passed the test.
If less than 15 cycles are completed before damage or failure, then a test should be
conducted on the original part and the results compared.
If the damage of failure point is no worse than the quantity of cycles of the original part –
10%, then the test is regarded as having been passed.
Damage or failure, in this context, means:
5.1.5.1. During the Test:
5.1.5.2. After the Test:
Temperature exceeds 600°C.
(a)
(b)
(c)
(d)
(e)
(f)
Contact between caliper and disc;
Cracks, permanent deformation or breakings;
Abnormal wear;
A 0.150mm maximum increasing of run-out, compared to the initial value
measured before the test, is allowed;
A 0.250mm maximum run-out is allowed;
A 0.100mm maximum (for "full floating" disc) straightness increasing, compared to
the initial value measured before the test, is allowed.

2. GROUPS OF DISCS
"Group of discs" means a grouping of similar discs, so that the tests performed on a
single disc are considered valid for the entire group of similar discs.
Discs belonging to the same group must have following features, as indicated at
following Paragraphs from 2.1. to 2.9.
For a given group of discs, the approval tests may be performed on one disc, belonging
to the group, subjected to the highest braking torque and to the largest energy to be
absorbed.
The similarity between the discs is defined by following grouping criteria, that must be
simultaneously fulfilled:
2.1. Same type of the reference disc for that group (one piece, composed fixed or floating).
2.2. Braking surface material to be chosen among those listed at Paragraph 5.3.3.2.2.; other
materials can be used provided that, under approval, they are declared with equal
demonstration of test results according to Paragraph 8. In this case, the extension
applies to all groups listed in Table 3 for dimensions equal or lower to that demonstrated.
2.3. Braking surface lightening: any solution is allowed (holes, slots, wave, etc.) provided
that:
2.3.1. For discs having the same diameter and thickness: the mass change of the braking
surface swept by the pads must be within the range of ±20% with respect to the
reference disc.

2.5. Same material and mechanical properties, as specified in the international standard for
materials, or higher, for the bell/braking surface fasteners.
2.6. Spokes of the bell with full/empty ratio – measured on the average circumference
between end of the mounting face and beginning of the braking surface – within the
range ±20%, thickness within the range (+30%) ÷ (–10%) and same mechanical
properties, as specified in the international standard for materials, with respect to the
reference disc.
2.7. Same technical solution for the bell-braking surface fasteners (same drawing and
materials; for the quantity of bell-braking surface fasteners, permitted the same quantity
with a tolerance of +2 –0).
2.8. The quantity of fixing holes is not binding by group belonging, in order to ensure
interchangeability with original disc.
2.9. Outer diameter included in the range of 50mm, according to Table 2.9.:
Table A15/2.9.
Range [mm] One piece Composite fixed Floating discs
≥150 <200 X X X
≥200 <250 X X X
≥250 <300 X X X
≥300 <350 X X X
There are no groups for "peripheral" discs (fitted on the wheel outer diameter).
Note:
For new applications that will be included into an existing group, an increase of 10%
maximum kinetic energy is allowed with reference to the value used for the approval of
the disc of the reference group.
Data for the new calculation of kinetic energy must be traced from the product data sheet
issued by the vehicle manufacturer.
In the case of discs with applications on both wheels, front and rear, the approval tests at
Paragraph 8. shall be conducted on heaviest application.
Replacement Brake Lining Assemblies.