BRIEF ANALYSIS OF UNECE APROVAL OF REPLACEMENT BRAKE LINING ASSEMBLIES, DISCS AND DRUMS FOR POWER-DRIVEN VEHICLES AND THEIR TRAILERS

BRIEF ANALYSIS OF UNECE APROVAL OF REPLACEMENT BRAKE LINING ASSEMBLIES, DISCS AND DRUMS FOR POWER-DRIVEN VEHICLES AND THEIR TRAILERS

RELEASE DATE:2021-01-26 15:46
ABSTRACT: Vehicle brake linings are also called vehicle brake pads. They are composed of steel plates, friction materials, and adhesives. They are installed on the brake calipers. Under the pressure generated by the brake cylinders, they create friction with the brake discs or brake drums. Generate heat to achieve the purpose of vehicle deceleration. Brake linings and brake discs or drums are extremely important parts of the vehicle braking system. According to UN R90 regulation, non-original replacement brake lining assemblies, discs and drums need to be tested and achieve the E-mark type approval as vehicle parts in order to get access to the EU market.


GENERAL TECHNICAL REQUIREMENTS FOR REPLACEMENT PARTS
1. Satisfy the vehicle requirements of UN R13, UN R13-H or UN R78.
2. A replacement part shall display performance characteristics similar to that of the original part it is intended to replace.
3. A replacement part must possess adequate mechanical characteristics.
4. Brake linings shall not contain asbestos.
5. A replacement brake disc/drum shall exhibit sufficient deformation resistance under temperature.
6. The minimum thickness of the brake disc shall not be less than the minimum thickness of the original brake disc as specified by the vehicle manufacturer.
7. The maximum permissible inside diameter of the brake drum shall not be more than the maximum permissible inside diameter of the original brake drum specified by the vehicle manufacturer.

MECHANICAL CHARACTERISTICS OF REPLACEMENT BRAKE LINING ASSEMBLIES
For M1, M2, N1, O1, O2, L vehicles:
1. The minimum acceptable shear strength is 250 N/cm2 for pad assemblies and 100 N/cm2 for shoe assemblies.
2. The compressibility values shall not exceed 2 percent at ambient temperature and 5 percent at 400 °C for pad assemblies and 2 percent at ambient temperature and 4 per cent at 200 °C for shoe assemblies. This requirement does not apply to parking brake lining assemblies.

For M3, N2, N3, O3, O4 vehicles:
1. Shear strength test applies only to disc brake pad assemblies. The minimum acceptable shear strength is 250 N/cm2.
2. The compressibility values shall not exceed 2 percent at ambient temperature and 5 percent at 400 °C for pad assemblies and 2 percent at ambient temperature and 4 percent at 200 °C for shoe assemblies and drum brake linings.
3. Material hardness’s requirement applies to drum brake lining assemblies and drum brake linings. Replacement brake lining assemblies or replacement drum brake linings of the type for which approval is requested shall be tested for hardness according to Standard ISO 2039-2:1987. The hardness figure for the friction material at the rubbing surface shall be the mean value out of five sample linings from different production batches (if available) by taking five measurements at different places of each brake lining.

GENERAL TECHNICAL REQUIREMENTS FOR REPLACEMENT DISCS OR DRUMS
1. Original replacement brake discs/drums: no further requirements.
2. Identical brake discs/drums: no further requirements.
3. Equivalent replacement discs or drums: geometric requirements for discs; material and metallurgical requirements for discs or drums.
4. Interchangeable replacement discs or drums: material and metallurgical requirements for discs or drums.

TEST PROCEDURES OF VEHICLE TEST AND INERTIA DYNAMOMETER TEST FOR REPLACEMENT BRAKE LININGS OF M1 VEHICLES
Vehicle test: 
  1. Bedding (burnishing) procedure
  2. Performance check 
  3. Service braking system (Type-0 test with engine disconnected, Type-0 test with engine connected, Type-I test); Secondary braking system (Type-0 test with engine disconnected, vehicle laden); Parking braking system.
  4. Cold performance equivalence test/Speed sensitivity test

Inertia dynamometer test:
  1. Burnishing phase 1
  2. Burnishing phase 2 
  3. Recovery 
  4. Perform 5 brake applications from 80 km/h to 0 km/h 
  5. Cold performance equivalence test 
  6. Speed sensitivity test 

THE PROCEDURE OF UN R90 TYPE APPROVAL
1. Application Submission
2. Initial Assessment
3. Technical Documents and Samples Preparation
4. Sample Delivery and Testing
5. Prepare test report and certificate
6. Submit test report and certificate
7. Issuance Certificate

ATIC PROVIDES AUTOMOTIVE GLOBAL HOMOLOGATION SERVICE
ATIC's vehicle homologation experts have an average of more than 10 years of experience in motor vehicle certification, and are familiar with multinational certification processes, local regulations, and testing requirements. ATIC cooperates with multinational official organizations and integrates high-quality testing and certification resources, to provide a global one-stop certification service for manufacturers to complete the certification process, including certification application, documentation preparation, regulatory guidance and training, and pre-testing and test coordination, etc. 

ATIC GLOBAL VEHICLE REGULATION RESEARCH & VEHICLE DEPARTMENT
ATIC Global Vehicle Regulation Research & Vehicle Department is committed to the global automotive regulatory framework, procedure research and vehicle homologation. Based on the digital platform, ATIC Global Vehicle Regulation Research Department provides technical compliance services and automotive compliance solutions of more than 20 countries and regions. Our service includes: automotive homologation consulting, multi-country product certification solutions, technical compliance verification, regulatory interpretation and regulatory tracking, regulatory training and Q&A. ATIC experts are working under designated technical services in Europe to conduct Initial Assessment, Witness Testing and CoP assessment as authorized inspectors by authorities including e/E4 Netherland, e/E5 Sweden, e/E13 Luxembourg, e/E24 Ireland, e/E32 Latvia, e/E49 Cyprus, e/E36 Lithuania and E57 San Marino. ATIC serves more than 400 whole vehicle and component manufactures each year in China.

UNECE CERTIFICATION PLEASE CONTACT 

Bruce(正)
Bruce Chen
Regulatory Researcher
Master's degree from Nanjing University of Technology, specializing in whole vehicle performance testing and certification solutions for global whole vehicle type approval.
Phone: +86 15261862012
Email: bruce.chen@atic-cn.com