ISO/PAS 13146:2024
(Main)Road vehicles — Brake lining friction materials — Drag mode friction test for hydraulic and pneumatic vehicle brakes
Road vehicles — Brake lining friction materials — Drag mode friction test for hydraulic and pneumatic vehicle brakes
This document specifies a method for the drag mode friction test for hydraulic and pneumatic vehicle brakes. This document is applicable to the friction performance test of brake linings used in vehicles of categories M, N, O, and L.
Véhicules routiers — Matériaux de friction des garnitures de freins — Essai de frottement pour les freins hydrauliques et pneumatiques de véhicules
General Information
Standards Content (Sample)
Publicly
Available
Specification
ISO/PAS 13146
First edition
Road vehicles — Brake lining
2024-11
friction materials — Drag mode
friction test for hydraulic and
pneumatic vehicle brakes
Véhicules routiers — Matériaux de friction des garnitures de
freins — Essai de frottement pour les freins hydrauliques et
pneumatiques de véhicules
Reference number
© ISO 2024
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ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 2
5 Test conditions . 2
5.1 Test equipment and parts .2
5.2 Requirement .2
5.3 Brake temperature measurement .3
6 Test type. 4
7 Method A: Brake lining assemblies for vehicles of categories M , M , N , O , O and L . 4
1 2 1 1 2
7.1 General .4
7.2 Determination of test pressure and torque .4
7.2.1 Determination of test pressure and torque of the original sample method .4
7.2.2 Determination of test pressure and torque of the sampling method .5
7.3 Brake rotor and brake caliper conditions .5
7.4 Sample preparation .5
7.4.1 Sample preparation of the original sample method .5
7.4.2 Sample preparation of the sampling method .6
7.5 Thickness and mass measurement .6
7.6 Test procedure .6
7.6.1 Test procedure 1: Constant torque mode .6
7.6.2 Test procedure 2: Constant pressure mode .7
7.7 Evaluation of test results.8
7.7.1 General .8
7.7.2 Cold coefficients of friction and coefficients of friction during normal operation .8
7.7.3 Minimum, maximum and fading coefficients of friction .10
8 Method B: Rotor and drum brake lining assemblies for vehicles of categories M , N , N ,
3 2 3
O and O .12
3 4
8.1 General . 12
8.2 Determination of test pressure for sampling method . 13
8.3 Brake rotor and brake caliper conditions for the sampling method . 13
8.4 Sample preparation . 13
8.5 Thickness and mass measurement . 13
8.6 Test procedure . 13
8.7 Evaluation of test results.14
9 Test report .15
Annex A (normative) Test bench. 16
Annex B (informative) Effective friction radius (r ) . 17
eff
Annex C (normative) Brake torque .18
Annex D (informative) Templates .29
iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
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The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
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This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 33, Vehicle
dynamics, chassis components and driving automation systems testing.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
Introduction
Assessing friction performance is a primary concern when developing friction materials and conducting
quality control. The brake assembly simulation test plays an important role here. However, the dyno test
is not adapted to all vehicle models and brakes, and the assembly test is expensive and time-consuming.
Therefore, a test method that can simulate real working conditions while only targeting friction materials is
needed for the quality control of friction materials.
There are two ways to evaluate the friction performance of vehicle friction materials. One is through
constant speed dragging, and the other is deceleration braking. The constant speed dragging braking mode
can be used for the small sample test and assembly test. This braking mode is similar to actual driving
conditions, brake system characteristics and automotive vehicle dynamics.
This document proposes a constant speed dragging test procedure for vehicle friction materials, which is
used to evaluate the consistency of the performance of friction materials. Users assess and report on the test
result according to their own specific requirements, such as friction levels or brake lining or rotor wear.
This test procedure has the following characteristics.
— The test data is comparable to the full-size assembly test.
— The test results can be used to compare friction materials.
— The test method is used to test the performance of friction materials. The test can be applied to raw
material screening, early product development, process quality control and sample testing. The test is
also an important means to test product consistency and quality control.
— The test method is made more efficient by using full-size brake linings, calipers and rotors. It is less
expensive than testing on a full-size dynamometer test bench.
v
Publicly Available Specification ISO/PAS 13146:2024(en)
Road vehicles — Brake lining friction materials — Drag mode
friction test for hydraulic and pneumatic vehicle brakes
1 Scope
This document specifies a method for the drag mode friction test for hydraulic and pneumatic vehicle brakes.
This document is applicable to the friction performance test of brake linings used in vehicles of categories M,
N, O, and L.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 611, Road vehicles — Braking of automotive vehicles and their trailers — Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 611 and the following apply.
ISO and IEC maintain terminology databases for use in standardizatio
...
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