GB/T 18274-2017 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 18274-2017 | English | 150 |
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Technical Specifications for Motor Vehicle Brake System
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| GB/T 18274-2000 | English | 199 |
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Technical specifications for motor vehicle drum brake being overhauled
| Obsolete |
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Similar standards GB 16897 GB 21670 GB/T 18274-2017: Technical Specifications for Motor Vehicle Brake System---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/GBT18274-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.40
T 24
Replacing GB/T 18274-2000, GB/T 18275.1-2000, GB/T 18275.2-2000,
GB/T 18343-2001
Technical Specifications for
Motor Vehicle Brake System
Issued on. OCTOBER 14, 2017
Implemented on. MAY 01, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative References... 4
3 Terms and Definitions... 4
4 Technical Requirements... 5
5 Inspection Rules... 18
6 Other... 18
Appendix A (Normative) Maintenance Reference Data on Brake Disc, Brake
Friction Block for Disc Brake of Common Vehicles... 19
Foreword
This Standard was drafted as per the rules specified in GB/T 1.1-2009.
This Standard replaced GB/T 18274-2000 Technical Specifications for Motor Vehicle
Drum Brake Being Overhauled, GB/T 18275.1-2000 Specifications for Automobile
Braking Transmission Device Being Overhauled – Air Braking, GB/T 18275.2-2000
Specifications for Automobile Braking Transmission Device Being Overhauled –
Hydraulic Braking, and GB/T 18343-2001 Specification for Automobile Disk Brakes
Being Overhauled; this Standard has the major technical changes as follows besides
the editorial modifications.
--- Add the technical requirements for brake’s parking brake devices (see 4.6);
--- Add the requirements for warranty period of brake maintenance (see 6.2).
This Standard was proposed by Ministry of Transport of the PRC.
This Standard shall be under the jurisdiction of National Technical Committee for
Standardization of Automobile Maintenance (SAC/TC 247).
Drafting organizations of this Standard. Research Institute of Highway of Ministry of
Transport, Hangzhou Changyun Transport Group Co., Ltd., and Zhejiang Institute of
Communication.
Chief drafting staffs of this Standard. Liu Jiannong, Jin Baizheng, Zhu Guojun, Zhao
Jinxiang, Zhan Yuanwu, and Zhang Mingjian.
The historical editions replaced by this Standard are as follows.
--- GB/T 18274-2000;
--- GB/T 18275.1-2000;
--- GB/T 18275.2-2000;
--- GB/T 18343-2001.
Technical Specifications for
Motor Vehicle Brake System
1 Scope
This Standard specifies the technical requirements and test rules for the completion of
disk brake, drum brake, air braking transmission device, hydraulic braking
transmission device and parking brake device being overhauled.
This Standard is applicable to the overhaul of brakes and brake transmission devices
for automobiles and trailers; the overhaul of brakes for other types of vehicles can refer
to.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) are applicable to this document.
GB/T 5624 Motor Vehicle Maintenance and Repair Terms
GB 5763 Brake Linings for Automobiles
GB 7258 Safety Specifications for Motor Vehicles Operating on Roads
3 Terms and Definitions
The following terms and definitions and those ones stipulated in GB/T 5624 are
applicable to this document.
4 Technical Requirements
4.1 Basic requirements
4.1.1 Diagnose the failure of the brake system before repair; find out and determine
the cause and location of the failure; meanwhile make a record.
4.1.2 The brake shall be dismantled according to the following requirements.
4.1.3 The following operations shall be performed after the brake is dissembled.
4.2 Disc brake
4.2.1 Brake caliper
4.2.1.1 The brake caliper cylinder shall be free of rust or damage; otherwise it shall
be replaced.
4.2.2 Brake disc
4.2.2.1 The brake disc shall be free of cracks; its working surface shall be free of rust
spots or shrinkage holes or the like defects.
4.2.2.2 The total thickness of vehicle bake disc shall meet the original technical
requirements of the manufacturer; if there is no specified value, it shall be no less than
the standard thickness of 2.0mm; the maximum amount of radical runout shall be
0.15mm; the depth of scratch groove shall be no greater than 0.38mm.
4.2.3 Brake friction block
4.2.3.1 There shall be free of cracks or burns; the wear shall be uniform.
4.2.3.2 After wearing, the thickness of the brake friction block of vehicle shall meet
the original technical requirements of the manufacturer; if there is no specified
thickness value, and the value is less than 1.5mm, then it shall be replaced.
4.2.4 Maintenance data
4.2.4.1 The maintenance reference data of the common brake disc and brake friction
block of the vehicles can see Table A.1.
4.2.4.2 The maintenance reference data of the common brake disc and brake friction
block of the large passenger car can see Table A.2.
4.3 Drum brake
4.3.1 Brake drum
4.3.1.1 The brake drum shall be replaced timely in the following cases.
4.3.1.2 When the brake drum is being machined, the left and right brake drums on
the same axis shall be cut to the same size by the same method to ensure the use of
the brake drum have the same braking performance on the both wheels. Multiple
shallow cutting methods shall be used for cutting. The main axis speed is 150r/min
when cutting; when taking the rough cutting, the transverse feed per revolution is
0.15mm~0.20mm; when taking the fine cutting, the transverse feed per revolution is
no greater than 0.05mm.
4.3.2 Brake shoes and brake base plate
4.3.2.1 After the brake drum is disassembled, inspect each brake shoes, brake shoe
return springs, compression spring and support pins, and the like components.
4.3.2.7 Clean the brake shoe and remove the burr; the mating clearance between
the brake shoe pin hole and support pin shall meet the original technical requirements
of the manufacturer; if there is no specified clearance value, it shall be no greater than
0.30mm.
4.3.2.8 If the brake base plate has distortion, cracks, or grooves, it shall be replaced.
Tighten the fixing bolts of the brake base plate and the support pin fixed by the bolts
as per the specified torque. The brake baes plate has no rust or other surface defects.
4.3.2.9 When the free length and elasticity of the brake shoe return sprint and
compression spring change, exceeds the original technical requirements of the
manufacturer, or when there is twisting, bending, or hook damaging, it shall be
replaced.
4.3.3 Brake clearance
After the brake is installed, adjust the brake clearance; the wheel shall be rotate freely
without any drag. The clearance between the brake shoe lining and brake drum shall
meet the original technical requirements of the manufacturer; if there is no specification,
the clearance shall be 0.20mm~0.40mm.
4.4 Air-pressure braking transmission device
4.4.1 Air compressor
4.4.5 Oil-water separator
The pressure on inlet and outlet of the oil-water separator shall be equal. The air
pressure of the safety valve shall be adjusted according to the original technical
requirements of the manufacturer; and work soundly. The filter core shall be cleaned
and worked reliably; all valves and gaskets shall not have cracks or aging phenomena.
4.4.8 Brake pedal
The clearance between the brake pedal bushing and the pedal shaft shall be no greater
than 0.3mm. Under the normal assembly and use conditions, the brake pedal
assembly shall ensure the flexible and light brake operation. The free stroke of the
brake pedal shall meet the original technical requirements of the manufacturer.
4.5 Hydraulic brake transmission device
4.5.1 Brake master cylinder and wheel cylinder
4.5.1.1 The mating clearance between the master cylinder piston and cylinder of
hydraulic brake shall meet the original technical requirements of manufacturer.
4.5.1.2 The surface roughness of the cylinder of the master cylinder and wheel
cylinder in the stroke of the piston and on the outer cylindrical surface of the piston
shall be no greater than Ra 0.8.
4.5.1.3 The tolerance BETWEEN cylinder of master cylinder and wheel cylinder AND
outer diameter of piston shall meet the original technical requirements of the
manufacturer; The dimensional tolerance of the inner hole of the cylinder of the wheel
cylinder shall be selected as per Table 2.
4.6 Parking brake device
4.6.1 Each control device and transmission device of the parking brake system shall
have good performance and reliable operation.
4.6.2 Check and adjust the parking brake clearance and free stroke, so that they
meet the original technical requirements of the manufacturer.
4.6.3 Check the parking brake indicator switch, when the parking brake level is pulled
up, it shall be ignited; when it is released, it shall be extinguished.
4.6.4 Check the parking brake performance, under the no-load conditions, the
parking brake device shall be able to ensure the vehicle to maintain motionless in the
positive and negative directions on the 20% slope (15% for the vehicles with total mass
about 1.2 times less of the unladen mass), or on the slope with the adhesion coefficient
between tyre and road greater than or equal to 0.7; the time shall be greater than or
equal to 5min; the locking device is reliable.
5 Inspection Rules
5.1 The brake system being repaired shall be tested the braking performance.
5.2 The braking performance test can take the road test or bench test.
6 Other
6.1 The repair of parts and components not specified in this Standard shall comply
with the provisions of the original maintenance manual or the technical documents
approved by the prescribed procedure.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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