ISO/PAS 22596:2022

PUBLICLY ISO/PAS
AVAILABLE 22596
SPECIFICATION
First edition
2022-05
Road vehicles — Brake lining friction
materials — Dynamometer metal
pick-up generation procedure for disc
brakes
Véhicules routiers — Matériaux de friction des garnitures de freins —
Procédure de génération de métal aggloméré sur freins à disque par
dynamomètre
Reference number
© ISO 2022
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ii
Contents Page
Foreword .v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms.3
4.1 Symbols . 3
4.2 Abbreviated terms . 3
5 Test conditions and test preparation . .3
5.1 Inertia for the brake testing . 3
5.2 Pressure ramp rate . 4
5.3 Maximum pressure . 4
5.4 Sampling rate . 4
5.5 Initial brake temperature . 4
5.6 Brake temperature measurement . 4
5.7 Cooling air conditioning . 4
5.8 Cooling air velocity or volume . 4
5.9 Exhaust conditions . 4
5.10 Conditioning settings for temperature and absolute humidity (humidity ratio) . 4
5.11 Dynamometer rotational speed between brake applications . 5
5.12 Orientation of brake set-up . 5
5.13 Direction of air relative to the brake set-up . 6
5.14 Wear measurement . 6
5.15 Disc lateral run-out . 6
5.16 Caliper, disc or drum and pads condition . 6
5.17 Hot brake applications . 6
5.18 Water specification . 6
5.19 Specification of nozzles for water spraying . 6
5.20 Saltwater specification . 6
5.20.1 Recommended solution . 6
5.20.2 Alternative solutions . 7
5.20.3 Other solutions . 7
5.21 Noise and vibration (NVH) measurements . 7
5.22 Data collection . 7
6 Test procedures . 8
6.1 Basic information . 8
6.2 Test procedure: “heat and pressure MPU” . 8
6.3 Test procedures “water and saltwater MPU” . 9
6.3.1 Procedure 1 (core or early development testing) . 9
6.3.2 Procedure 2 (DVP procedure; can also be used in vehicle testing) . 10
6.4 Test procedure for “low load and pressure” . 14
7 Test report .15
7.1 General . 15
7.2 Test conditions . 15
7.2.1 Disc and lining identification . 15
7.2.2 Disc surface characterisation . 15
7.2.3 Photographs of the setup . 15
7.2.4 Photographs of the test parts . 15
7.2.5 Documentation of pad MPU number and area . 16
7.2.6 Documentation of disc surface profile . 17
7.2.7 Acceptance criteria . 19
7.3 Graphical report . 20
iii
7.4 Cooling air conditions and water spraying . 20
7.5 Tabular data for each brake application . 20
7.6 Wear measurement; pad and disc appearance . 21
Annex A (informative) MPU shapes.22
Annex B (informative) Template proposal .24
Annex C (informative) Reference calculation for cooling air speed and flow .33
Annex D (informative) Specification of salt for “water and salt MPU” .35
Bibliography .36
iv
Foreword
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electrotechnical standardization.
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described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
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This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 33,
Vehicle dynamics and chassis components.
Any feedback or questions on this document should be directed to the user’s national standards body. A
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v
Introduction
Metal pick-up (MPU) is a phenomenon/issue observed in automotive disc brakes during the braking
process. Worn metallic particles may agglomerate under specific conditions and embed
...