ISO/PAS 22596:2022
Road vehicles — Brake lining friction materials — Dynamometer metal pick-up generation procedure for disc brakes
This document describes test procedures for assessing the influence of pressure, temperature and water/salt water on the generation of metal pick-up (MPU) for a given friction material in combination with a specific brake disc. There are multiple tests to investigate the MPU generation issue for different types of friction materials (so called NAO and low metallic materials) under critical environmental and working conditions: influence of water and salt water, high temperatures and high pressures and low temperatures and low pressures.
This document supports the friction material development process and selection of friction materials for new brake applications.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
4.1 Symbols
4.2 Abbreviated terms
5 Test conditions and test preparation
5.1 Inertia for the brake testing
5.2 Pressure ramp rate
5.3 Maximum pressure
5.4 Sampling rate
5.5 Initial brake temperature
5.6 Brake temperature measurement
5.7 Cooling air conditioning
5.8 Cooling air velocity or volume
5.9 Exhaust conditions
5.10 Conditioning settings for temperature and absolute humidity (humidity ratio)
5.11 Dynamometer rotational speed between brake applications
5.12 Orientation of brake set-up
5.13 Direction of air relative to the brake set-up
5.14 Wear measurement
5.15 Disc lateral run-out
5.16 Caliper, disc or drum and pads condition
5.17 Hot brake applications
5.18 Water specification
5.19 Specification of nozzles for water spraying
5.20 Saltwater specification
5.20.1 Recommended solution
5.20.2 Alternative solutions
5.20.3 Other solutions
5.21 Noise and vibration (NVH) measurements
5.22 Data collection
6 Test procedures
6.1 Basic information
6.2 Test procedure: “heat and pressure MPU”
6.3 Test procedures “water and saltwater MPU”
6.3.1 Procedure 1 (core or early development testing)
6.3.2 Procedure 2 (DVP procedure; can also be used in vehicle testing)
6.4 Test procedure for “low load and pressure”
7 Test report
7.1 General
7.2 Test conditions
7.2.1 Disc and lining identification
7.2.2 Disc surface characterisation
7.2.3 Photographs of the setup
7.2.4 Photographs of the test parts
7.2.5 Documentation of pad MPU number and area
7.2.6 Documentation of disc surface profile
7.2.7 Acceptance criteria
7.3 Graphical report
7.4 Cooling air conditions and water spraying
7.5 Tabular data for each brake application
7.6 Wear measurement; pad and disc appearance
Annex A (informative) MPU shapes
Annex B (informative) Template proposal
Annex C (informative) Reference calculation for cooling air speed and flow
Annex D (informative) Specification of salt for “water and salt MPU”
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
4.1 Symbols
4.2 Abbreviated terms
5 Test conditions and test preparation
5.1 Inertia for the brake testing
5.2 Pressure ramp rate
5.3 Maximum pressure
5.4 Sampling rate
5.5 Initial brake temperature
5.6 Brake temperature measurement
5.7 Cooling air conditioning
5.8 Cooling air velocity or volume
5.9 Exhaust conditions
5.10 Conditioning settings for temperature and absolute humidity (humidity ratio)
5.11 Dynamometer rotational speed between brake applications
5.12 Orientation of brake set-up
5.13 Direction of air relative to the brake set-up
5.14 Wear measurement
5.15 Disc lateral run-out
5.16 Caliper, disc or drum and pads condition
5.17 Hot brake applications
5.18 Water specification
5.19 Specification of nozzles for water spraying
5.20 Saltwater specification
5.20.1 Recommended solution
5.20.2 Alternative solutions
5.20.3 Other solutions
5.21 Noise and vibration (NVH) measurements
5.22 Data collection
6 Test procedures
6.1 Basic information
6.2 Test procedure: “heat and pressure MPU”
6.3 Test procedures “water and saltwater MPU”
6.3.1 Procedure 1 (core or early development testing)
6.3.2 Procedure 2 (DVP procedure; can also be used in vehicle testing)
6.4 Test procedure for “low load and pressure”
7 Test report
7.1 General
7.2 Test conditions
7.2.1 Disc and lining identification
7.2.2 Disc surface characterisation
7.2.3 Photographs of the setup
7.2.4 Photographs of the test parts
7.2.5 Documentation of pad MPU number and area
7.2.6 Documentation of disc surface profile
7.2.7 Acceptance criteria
7.3 Graphical report
7.4 Cooling air conditions and water spraying
7.5 Tabular data for each brake application
7.6 Wear measurement; pad and disc appearance
Annex A (informative) MPU shapes
Annex B (informative) Template proposal
Annex C (informative) Reference calculation for cooling air speed and flow
Annex D (informative) Specification of salt for “water and salt MPU”
Bibliography