GB/T 3565.4-2022 in English

《GB/T 3565.4-2022自行车安全要求 第4部分：车闸试验方法》由TC155（全国自行车标准化技术委员会）归口，主管部门为中国轻工业联合会。

Safety requirements for bicycles - Part 4: Braking test methods

1 Scope

This document specifies the test methods for brake lever grip dimensions, position of applied force on the brake lever, assembly security, braking system strength, braking performance and heat resistance of the brakes of the bicycle.

This document is applicable to the test of braking components for bicycles involved in GB 3565.2.

2 Normative references

The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 3565.1 Safety requirements for bicycles - Part 1: Terms and definitions (GB/T 3565.1-2022, ISO 4210-1: 2014, MOD)
GB 3565.2-2022 Safety requirements for bicycles - Part 2: Requirements for city and trekking, young adult, mountain and racing bicycles (ISO 4210-2: 2015, MOD)

Note: There is no technical difference between the referenced content from GB 3565.2-2022 and that from ISO 4210-2: 2015.

3 Terms and definitions

For the purposes of this document, the terms and definitions given in GB/T 3565.1 apply.

4 Test methods

4.1 Brake lever grip dimensions

4.1.1 Test method for type A or type B brake lever

Fit the gauge illustrated in Figure 1 over the handlebar grip or the handlebar (when the manufacturer does not fit a grip) and the brake lever as shown in Figure 2 so that face A is in contact with the handlebar (or grip) and the side of the brake lever. Ensure that face B spans an area of that part of the brake lever which is intended for contact with the rider’s fingers without the gauge causing any movement of the brake lever towards the handlebar or grip. Measure the distance, a, the distance between the last part of the lever intended for contact with the rider’s fingers and the end of the lever. The measurement shall be conducted only on a fully assembled bicycle.

Dimensions in millimeters


Key:
A——face A;
B——face B; C——rod;
D——75mm or 90mm.

Figure 1 Brake lever grip dimension gauge for type A and type B

Foreword i
Introduction iii
1 Scope
2 Normative references
3 Terms and definitions
4 Test methods
4.1 Brake lever grip dimensions
4.2 Brake levers - position of applied force
4.3 Brake-block and brake-pad assemblies - security test
4.4 Hand-operated braking-system - strength test
4.5 Back-pedal braking system - strength test
4.6 Braking performance
4.7 Brakes - Heat-resistance test
Annex A (Informative) Explanation of the method of least squares for obtaining the line of best fit and ±20% limit lines for braking performance linearity
Bibliography