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GB 21670-2025: Technical requirements and testing methods for passenger car braking systems
Status: Valid GB 21670: Evolution and historical versions
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Technical requirements and testing methods for passenger car braking systems
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GB 21670-2025
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| GB 21670-2008 | English | 145 |
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Technical requirements and testing methods for passenger car braking systems
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Basic data | Standard ID | GB 21670-2025 (GB21670-2025) | | Description (Translated English) | Technical requirements and testing methods for passenger car braking systems | | Sector / Industry | National Standard | | Classification of Chinese Standard | T24 | | Classification of International Standard | 43.040.40 | | Word Count Estimation | 78,762 | | Date of Issue | 2025-05-30 | | Date of Implementation | 2026-01-01 | | Older Standard (superseded by this standard) | GB 21670-2008 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB 21670-2025: Technical requirements and testing methods for passenger car braking systems---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
National Standard of the People's Republic of China
ICS 43.040.40CCS T 24
Technical requirements and test methods for passenger car brake systems
2025-05-30 Release
2026-01-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Replaces GB 21670-2008
Table of contents
Preface Ⅲ
1 Scope...1
2 Normative references ...1
3 Terms and Definitions 1
4 Symbols and abbreviations 5
5 Structural and functional requirements 7
6 Test and performance requirements 16
7 Test methods 29
8 Determination of the same type...48
9 Implementation of standards 49
Appendix A (Normative) Functional safety requirements for electronic brake control systems ...50
Appendix B (Normative) Requirements for functional safety test report of brake electronic control system 61
Appendix C (Normative) Requirements for functional safety description of electronic brake control systems 64
Appendix D (Normative) Test Procedure for State of Charge of Power Storage Batteries 66
Appendix E (Normative) Braking and running deviation test requirements for vehicles equipped with temporary spare wheels/tire 67
Appendix F (Normative) Vehicle parameters and test data processing requirements 68
Foreword
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 is required.
This document replaces GB 21670-2008 "Technical requirements and test methods for passenger car brake systems". Compared with GB 21670-2008,
In addition to structural adjustments and editorial changes, the main technical changes are as follows.
a) The terms "vehicle type", "opening pressure", "closing pressure", "safety concept", "complex electronic vehicle control system", and "upper level control" have been deleted.
“Control range”, “different types of braking systems”, “no load”, “full load” and their definitions (see Chapter 3 of the.2008 edition);
b) Changes to brake equipment, controls, transmissions, brakes, brake system components, progressive/adjustable brakes, wheels/axles
load, energy storage hydraulic brake system, power battery, charge state, automatic control brake, selective brake, nominal value, full cycle,
Terms and definitions for electronic control systems, units, and transmission chains (see Chapter 3, Chapter 3 of the.2008 edition);
c) Added the terms “brake system”, “brake signal”, “emergency brake signal”, “energy source”, “storage device”, “power supply device”, “storage state”, etc.
state”, “storage performance”, “power transmission brake system”, “brake demand value”, “aging effect”, “energy management system” and their definitions (see
Chapter 3);
d) symbols and abbreviations have been changed (see Chapter 4, Appendix A of the.2008 edition);
e) Changed the electromagnetic compatibility related requirements (see 5.1.1.4, 6.5.1.5, 4.1.1.4, 4.2.18.4, 5.6.2.5 of the.2008 edition);
f) The functional safety requirements for electronic brake control systems have been changed (see 5.1.3, Appendix A, and 4.1.3, Appendix D of the.2008 edition);
g) The requirements for energy sources other than driver’s human energy have been changed (see 5.2.4, 4.2.4 of the.2008 edition), and the requirements for ETBS have been added.
Transmission failure requirements [see 5.2.4 d)];
h) The difference requirement of braking demand value has been changed [see 5.2.8 a), 4.2.8.1.1 of the.2008 edition];
i) Changed the requirements for parking release [see 5.2.10, 5.2.19 d), 4.2.10, 4.2.19.4 of the.2008 edition];
j) Changed the inspection requirements for the wear of service brake friction components (see 5.2.11, 4.2.11.2 of the.2008 edition);
k) Changed the implementation documents of brake fluid level mark and graphic mark for hydraulic transmission brake system, with GB/T 5345 replacing GB/T 14168
(See 5.2.13, 4.2.13 of the.2008 edition);
l) Changed the requirements for alarm devices [see 5.2.14 a), 4.2.14.1 of the.2008 edition], adding the requirements for alarm devices for vehicles equipped with ETBS.
Requirements for installation [see 5.2.14 c) and e)];
m) The requirements for energy supply of auxiliary equipment have been changed (see 5.2.16, 4.2.16 of the.2008 edition);
n) Added the following provisions for vehicles with type A and type B electric regenerative braking systems. braking by releasing the accelerator pedal
Requirements for action [see 5.2.18 f)];
o) Changed the requirements for an electrical failure in a parking brake system with electronic transmission [see 5.2.19 b],.2008 Edition
4.2.19.2], changed the energy requirements for the electronic transmission device of the parking brake system [see 5.2.19 c), the.2008 edition
4.2.19.3];
p) Changed the requirements for service brake systems equipped with electronically controlled transmission devices [see 5.2.20, 4.2.20 of the.2008 edition];
q) The requirements for acoustic signals when certain failures (or malfunctions) occur in passenger car brake equipment have been deleted (see 4.2.21.1.3 of the.2008 edition);
r) Added ETBS to ensure that the alarm signal is always present even when the storage device is affected by environmental conditions (such as temperature) and aging effects.
Still able to light up as required [see 5.2.21 c) 3)];
s) Changed the requirements for brake light illumination (see 5.2.22, 4.2.21.6 of the.2008 edition);
t) Added requirements for emergency brake signals (see 5.2.23);
u) Added ETBS special requirements (see 5.2.24);
v) Added braking and running deviation test requirements for vehicles equipped with temporary spare wheels/tyres (see 5.2.25, Appendix E);
w) Added the requirement for M1 vehicles to be equipped with an anti-lock braking system (see 5.2.26);
x) Changed the requirements for the allowable deviation between the initial speed and the specified speed (see 6.1.1.2, 5.1.1.2 of the.2008 edition);
y) The test vehicle speed requirement has been changed (see 6.1.2.9, 5.1.2.9 of the.2008 edition);
z) Changed the requirements for power batteries that power electric service brakes (see 6.1.2.11, 5.1.2.11 of the.2008 edition);
aa) Changed the requirements for the O-type test charge state of the B-type electric regenerative braking system [see 6.1.4.1.2 d], the.2008 edition
5.1.4.1.2.3];
ab) The Type O test requirements for power release have been modified (see 6.1.4.2, 5.1.4.2 of the.2008 edition);
ac) Changed the requirements for the O-type test transmission gear position (see 6.1.5.1.4, 5.1.5.1.4 of the.2008 edition);
ad) Changed the start time and conditions of hot performance test (see 6.1.5.2, 5.1.5.2.1 of the.2008 edition);
ae) Changed the requirements for hot performance test of vehicles equipped with Type B electric regenerative braking system [see 6.1.5.2 c),.2008 Edition
5.1.5.2.4];
af) Changed the requirements for the recovery process test of vehicles equipped with a Type B electric regenerative braking system (see 6.1.5.3.2,.2008 Edition)
5.1.5.3);
ag) The requirements for the distribution of braking force between axles have been deleted (see 5.5 of the.2008 edition);
ah) deleted the types equipped with anti-lock braking system (see 5.6.1 of the.2008 edition);
ai) Added the requirements for the response time of vehicles equipped with ETBS during emergency braking [see 6.3 c)];
aj) Changed the requirements for actuation of the service brake control device when the vehicle is stationary (see 6.5.2.1.2.4,.2008 Edition)
5.6.3.1.1.4);
ak) The method for determining the maximum braking strength of a vehicle has been changed (see 6.5.3.1.3, 5.6.4.1.1.3 of the.2008 edition);
al) Added kpeak (maximum value of the “adhesion coefficient-slip ratio” curve) and klock (adhesion coefficient value when the slip ratio is 100%)
Calculation method (see 6.5.5.1~6.5.5.3);
am) added requirements for power transmission brake system power supply devices and storage devices (see 6.6);
an) The overall test requirements have been changed (see 7.1, Chapter 7 of the.2008 edition);
ao) The requirements for test sites and test equipment have been changed (see 7.2, 7.1 of the.2008 edition);
ap) The requirements for test vehicles have been changed (see 7.3, 7.2 of the.2008 edition);
aq) The requirements for static test data and document inspection have been changed (see 7.4.1, 7.3.1 of the.2008 edition);
ar) The test method for brake circuit inspection has been changed (see 7.4.2.3, 7.3.2.3 of the.2008 edition);
as) The test method for inspection of brake lining wear has been changed (see 7.4.3.2, 7.3.3.2 of the.2008 edition);
at) Added inspection methods for evaluating the wear condition of brake drum and brake disc surfaces (see 7.4.3.3);
au) The test method for parking brake system inspection has been changed (see 7.4.4.2, 7.3.4.2 and 7.3.16 of the.2008 edition);
av) The bench test method has been changed (see 7.4.5, 7.3.5 of the.2008 edition);
aw) Changed the test method for checking the proportional relationship between control force and line pressure (brake demand value and brake force) (see 7.4.7,.2008
Version 7.3.7);
ax) Added the test method for vehicles equipped with ETBS (braking demand value and braking force) (see 7.4.7.2);
ay) The test method for additional inspection of parking brake systems with electronic transmission has been changed (see 7.4.10.2, 7.3.10 of the.2008 edition);
az) Added the test method for additional inspection of the service brake system with electronically controlled transmission device (see 7.4.11.3);
ba) The test method for checking the brake signal indicating the brake light is on has been changed (see 7.4.14.2, 7.3.13.3 of the.2008 edition);
bb) Added the test method for emergency brake signal inspection (see 7.4.14.3);
bc) Added the test method for ETBS additional inspection (see 7.4.18);
bd) The requirement for the service brake temperature on the hottest axle in the dynamic test has been deleted (see 7.4.1.2 of the.2008 edition);
b) The O-type test method for power release has been changed (see 7.5.3.1, 7.4.3.1 of the.2008 edition);
bf) The O-type test method for power joints has been changed (see 7.5.3.2, 7.4.3.2 of the.2008 edition);
bg) The braking force distribution test method was deleted (see 7.4.4.8 of the.2008 edition);
bh) Deleted the test methods related to Type 2 and Type 3 ABS (see 7.4.5 and 7.4.6 of the.2008 edition);
bi) The response time test method has been changed (see 7.5.7.3, 7.4.7.3 of the.2008 edition);
bj) The full load-to-failure test method has been changed (see 7.5.8, 7.4.8 of the.2008 edition);
bk) Added brake signal test method (see 7.5.9);
bl) Added the emergency brake signal test method (see 7.5.10);
bm) Added the test method for ETBS storage performance inspection (see 7.5.11);
bn) Added the test method for inspection of ETBS power supply equipment (see 7.5.12);
bo) Added braking and running deviation test methods for vehicles equipped with temporary spare wheels/tyres (see 7.5.13);
bp) changed the requirements for the same type determination (see Chapter 8, Chapter 6 of the.2008 edition);
bq) added implementation and transition recommendations for the standard (see Chapter 9);
br) The inertia dynamometer test method for brake friction linings (see Appendix C of the.2008 edition) has been deleted;
bs) Added the requirements for functional safety test reports of brake electronic control systems (see Appendix B);
bt) Added the functional safety description requirements for brake electronic control systems (see Appendix C);
bu) Added braking and running deviation test requirements for vehicles equipped with temporary spare wheels/tire (see Appendix E);
bv) Changed the test report and related chart requirements (see Appendix F, Appendix E of the.2008 edition).
This document is proposed and coordinated by the Ministry of Industry and Information Technology of the People's Republic of China.
This document was first published in.2008 and this is the first revision.
Technical requirements and test methods for passenger car brake systems
1 Scope
This document specifies the structural and functional requirements, test and performance requirements and type determination requirements for passenger car brake systems.
Corresponding test methods.
This document is applicable to Category M1 vehicles specified in GB/T 15089.
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 4094 Marking of vehicle controls, indicators and signal devices
GB/T 5345 Labelling of containers for petroleum-based or non-petroleum-based brake fluids for road vehicles
GB/T 5620 Road vehicles - Terms and definitions for braking of motor vehicles and trailers
GB 12981 Motor vehicle brake fluid
GB/T 15089 Classification of motor vehicles and trailers
GB/T 34590 (all parts) Functional safety of road vehicles
GB 34660 Requirements and test methods for electromagnetic compatibility of road vehicles
3 Terms and definitions
The terms and definitions defined in GB/T 5620 and GB/T 34590.1 and the following apply to this document.
3.1
Braking equipment
All brake systems equipped on the vehicle.
3.2
Braking system
It is composed of a control device, a transmission device and a brake, which can gradually slow down or stop a moving vehicle, or keep a stopped vehicle stationary.
The state of the component combination.
3.3
Control device
A component that is directly operated by the driver to provide the transmission device with the energy required for braking or control.
Note. These energies include the driver's physical strength, other energy sources controlled by the driver, or a combination of different energies.
3.4
Transmission device
A combination of components that is located between the control device and the brake and enables the two to achieve functional connection.
Note 1.Transmission devices are classified as mechanical, hydraulic, pneumatic, electric or hybrid.
Note 2.When the braking force is provided or assisted by energy other than the driver's physical strength, the energy accumulator is considered to be part of the transmission device.
Note 3.The transmission device has two independent functions. control transmission and energy transmission. When this document uses the word "transmission" alone, it also means "control transmission".
and "energy transfer".
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