GB/T 22310-2023
Road vehicles—Brake linings—Effects of heat on dimensions and form of disc brake pads test method (English Version)

Standard No.

GB/T 22310-2023

Language

Chinese, Available in English version

Release Date

2023

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Latest

GB/T 22310-2023

Replace

GB/T 22310-2008

Introduction

GB/T 22310—2023 Standard Overview

This standard specifies the test method for thermal expansion of road vehicle brake lining disc brake pads, including hot plate method and oven method. It is applicable to molded or bonded disc brake pads with solid backing plate with a width not exceeding $120~\mathrm{mm}$, a height not exceeding $80~\mathrm{mm}$, and a thickness not exceeding $20~\mathrm{mm}$.

Background of Standard Revision

GB/T 22310-2023 replaces GB/T22310-2008. The main technical changes include:

• a) The “Scope” has been changed (see Chapter 1, Chapter 1 of the 2008 edition);
• b) The terms “growth” and “expansion” and their definitions have been added (see Chapter 3);
• c) The requirement of “when the back plate of the disc brake pad is equipped with a silencer, the silencer should be removed” has been added (see 5.1.1.3);
• d) The requirement of “oven method” has been added (see 5.2).

Comparison and analysis of test methods

Project	Hot plate method	Oven method
Scope of application	Applicable to measuring the dynamic change of the thermal expansion of disc brake pads.	Applicable to measuring the static dimensional change and temperature relationship of disc brake pads after heating.
Test equipment	Hard electric heating plate with a height of $80~\mathrm{mm}$, a width of $170~\mathrm{mm}$, and a thickness of $40~\mathrm{mm}$, equipped with fixtures and measuring devices.	Oven with circulating air, thickness gauge or micrometer with an accuracy of not less than $0.02\mathrm{mm}$.
Test steps	Includes heating, cooling and measuring processes, which must be repeated twice to ensure data accuracy.	Includes expansion and growth tests, as well as dimensional stability tests, which must be conducted at room temperature.

Terminology analysis

Growth: Permanent change in the external dimensions of a friction material when it is cooled to room temperature after undergoing high temperature cycles.

Swell: Temporary change in the external dimensions of a friction material when it is exposed to elevated temperatures.

Implementation Suggestions

To ensure the effectiveness and consistency of the test method, it is recommended that:

• Enterprises should follow the accuracy and performance indicators required by the standard when selecting test equipment;
• Operators should undergo professional training and be familiar with the differences and applicable scenarios of the two test methods;
• Establish a data recording and analysis system to ensure the traceability and accuracy of the test results.

GB/T 22310-2023 Referenced Document

• GB/T 5620 Road vehicles—Vocabulary and difinition for braking of automotive vehicles and their trailers

GB/T 22310-2023 history

• 2023 GB/T 22310-2023 Road vehicles—Brake linings—Effects of heat on dimensions and form of disc brake pads test method
• 2008 GB/T 22310-2008 Road vehicles.Brake linings.Effects of heat on dimensions and form of disc brake pads-test procedure

Standard and Specification