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GB/T 31970-2025: Performance requirements and bench test methods for air brake caliper assemblies of vehicles
Status: Valid GB/T 31970: Evolution and historical versions
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| GB/T 31970-2025 | English | 439 |
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Performance requirements and bench test methods for air brake caliper assemblies of vehicles
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GB/T 31970-2025
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| GB/T 31970-2015 | English | 90 |
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Performance Requirements and Bench Test Methods for Air Brake Caliper Assemble of Automobile
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GB/T 31970-2015
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Basic data | Standard ID | GB/T 31970-2025 (GB/T31970-2025) | | Description (Translated English) | Performance requirements and bench test methods for air brake caliper assemblies of vehicles | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | T24 | | Classification of International Standard | 43.040.40 | | Word Count Estimation | 22,246 | | Date of Issue | 2025-08-29 | | Date of Implementation | 2026-03-01 | | Older Standard (superseded by this standard) | GB/T 31970-2015 | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | GB/T 31970-2025: Performance requirements and bench test methods for air brake caliper assemblies of vehicles
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT31970-2025
ICS 43.040.40
CCST24
National Standard of the People's Republic of China
Replaces GB/T 31970-2015
Performance requirements of automobile pneumatic brake caliper assembly and
Bench test method
Released on August 29, 2025
Implementation on March 1, 2026
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Performance Requirements 2
4.1 Starting force 2
4.2 Mechanical efficiency 2
4.3 Clamp body rigidity 2
4.4 Sliding resistance of clamp body 2
4.5 Brake clearance self-adjusting function 3
4.6 Drag torque 3
4.7 Waterproofness 3
4.8 Working durability 3
4.9 Vibration durability 3
4.10 Torsional fatigue strength 3
4.11 Wear alarm function 3
4.12 Salt spray corrosion 3
4.13 Mud resistance 3
5 Test related requirements 4
5.1 Test equipment requirements 4
5.2 Sample Requirements 4
5.3 Test conditions 5
6 Test methods 5
6.1 Starting force 5
6.2 Mechanical efficiency 6
6.3 Clamp body rigidity 7
6.4 Sliding resistance of clamp body 8
6.5 Brake clearance self-adjusting function 9
6.6 Drag torque 9
6.7 Waterproofness 10
6.8 Working durability 10
6.9 Vibration durability 13
6.10 Torsional fatigue strength 13
6.11 Wear alarm function 13
6.12 Salt spray corrosion 14
6.13 Mud resistance 14
Preface
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document replaces GB/T 31970-2015 "Performance requirements and bench test methods for air brake caliper assemblies for automobiles" and
Compared with GB/T 31970-2015, in addition to structural adjustments and editorial changes, the main technical changes are as follows.
a) Added the terms "clamping force", "clamping force hysteresis", "mechanical efficiency" and "starting force" and their definitions (see 3.1 to 3.4);
b) The term “starting pressure” and its definition are deleted (see 3.1 of the.2015 edition);
c) The definition of the term "drag torque" has been changed (see 3.5, 3.2 of the.2015 edition);
d) The performance requirements and test methods for “starting pressure” have been deleted (see 4.1 and 6.1 of the.2015 edition);
e) Added the performance requirements and test methods for “starting force” (see 4.1 and 6.1);
f) Added performance requirements and test methods for “mechanical efficiency” (see 4.2 and 6.2);
g) The performance requirements and test methods for “clamp body rigidity” have been changed (see 4.3 and 6.3, 4.2 and 6.2 of the.2015 edition);
h) The test method for “sliding resistance of the clamp body” has been changed (see 6.4, 6.3 of the.2015 edition);
i) The performance requirements and test methods for the “brake clearance self-adjusting function” have been changed (see 4.5 and 6.5, and 4.4 and 6.4 of the.2015 edition);
j) The performance requirements and test methods for "drag torque" have been changed (see 4.6 and 6.6, 4.5 and 6.5 of the.2015 edition);
k) The performance requirements and test methods for "water resistance" have been changed (see 4.7 and 6.7, 4.6 and 6.6 of the.2015 edition);
l) The performance requirements and test methods for “operating durability” have been changed (see 4.8 and 6.8, 4.8 and 6.8 of the.2015 edition);
m) Added the performance requirements and test methods for “vibration durability” (see 4.9 and 6.9);
n) The performance requirements and test methods for “torsional fatigue strength” have been changed (see 4.10 and 6.10, 4.7 and 6.7 of the.2015 edition);
o) Added the performance requirements and test methods for “wear alarm function” (see 4.11 and 6.11);
p) The performance requirements and test methods for “Salt spray corrosion” have been changed (see 4.12 and 6.12, 4.9 and 6.9 of the.2015 edition);
q) Added the performance requirements and test methods for “mud resistance” (see 4.13 and 6.13).
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document is proposed by the Ministry of Industry and Information Technology of the People's Republic of China.
This document is under the jurisdiction of the National Technical Committee for Automotive Standardization (SAC/TC114).
This document was drafted by. China Automotive Engineering Research Institute Co., Ltd., Zhejiang Vie Technology Co., Ltd., FAW Jiefang Motor
Co., Ltd., BPW (Meizhou) Axle Co., Ltd., Jiangsu Hengli Brake Manufacturing Co., Ltd., Longzhong Holding Group Co., Ltd.,
Nanyunda Electromechanical Technology Co., Ltd., Wuhan Yuanfeng Auto Parts Co., Ltd., China Automotive Technology and Research Center Co., Ltd., Krono
Er Commercial Vehicle System Enterprise Management (Shanghai) Co., Ltd., Changchun Fusheng Tebike Brake Co., Ltd., Shaanxi Fast Hedex Braking System
Co., Ltd., Shandong Yuecheng Brake System Co., Ltd.
The main drafters of this document are. Wang Yingguo, Zeng Fanzhuo, Zhu Lijiang, Chen Feng, Li Xiguang, Lan Wenbiao, Qiao Guanpeng, Su Hui, Dong Foan, Chen Fei,
Liu Di, Chen Fangquan, Zuo Feng, Feng Xiqing, Zhang Zhongguo, Li Wei, Tang Jun.
This document was first published in.2015 and this is the first revision.
Performance requirements of automobile pneumatic brake caliper assembly and
Bench test method
1 Scope
This document specifies the performance requirements, test-related requirements for automotive pneumatic brake caliper assemblies and describes the bench test methods.
This document applies to floating pneumatic brake caliper assemblies (excluding brake chambers) whose working medium is compressed air.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 5620 Road vehicles - Terminology and definitions for brakes on motor vehicles and trailers
GB/T 10125-2021 Artificial atmosphere corrosion test Salt spray test
QC/T 239 Technical requirements and bench test methods for commercial vehicle service brakes
QC/T 316 Fatigue strength test method for automobile service brakes
QC/T 556 Automobile brake temperature measurement method and thermocouple installation requirements
3 Terms and Definitions
The terms and definitions defined in GB/T 5620 and the following apply to this document.
3.1
Clamping force
The brake caliper assembly, when actuated by a control device, exerts force on the axial end face of the brake disc between the two pad assemblies inside the caliper body.
3.2
Clamping force hysteresis
The difference in brake application and brake release input forces required to produce the same clamping force on the caliper assembly (see Figure 1).
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