Document ID: chunk:federal_register_of_legislation:F2021C00477:body:0:p57
Version: federal_register_of_legislation:F2021C00477
Segment Type: other
Provision Reference: 
Character Range: 149577–152533

4.4.1.1. Brake linings shall be tested according to the procedure given in paragraph 1.5.1. of Annex 3 to this Regulation.
4.4.2. Hot performance
4.4.2.1. On completion of the tests required under paragraph 4.4.1. of this annex, the hot braking performance test specified in paragraph 1.5.2. of Annex 3 to this Regulation shall be carried out.
4.4.2.2. The mean braking torque recorded during the above hot performance tests on the linings being tested for the purpose of comparison shall, for the same input measurement, be within the test limits 15 per cent of the mean braking torque recorded with the brake linings conforming to the component identified in the relevant application for vehicle type approval.
5. Inspection of brake linings
 Brake linings shall be visually inspected on completion of the above tests to check that they are in satisfactory condition for continued use in normal service.

Annex 8

Special requirements to be applied to the safety aspects
of complex electronic vehicle control systems
1. General
 This annex defines the special requirements for documentation, fault strategy and verification with respect to the safety aspects of Complex Electronic Vehicle Control Systems (definition 2.3. below) as far as this Regulation is concerned.
 This annex may also be called, by special paragraphs in this Regulation, for safety related functions which are controlled by electronic system(s).
 This annex does not specify the performance criteria for "The System" but covers the methodology applied to the design process and the information which must be disclosed to the Technical Service, for type approval purposes.
 This information shall show that "The System" respects, under normal and fault conditions, all the appropriate performance requirements specified elsewhere in this Regulation.
2. Definitions
 For the purposes of this annex,
2.1. "Safety concept" is a description of the measures designed into the system, for example within the electronic units, so as to address system integrity and thereby ensure safe operation even in the event of an electrical failure.
 The possibility of a fall-back to partial operation or even to a back-up system for vital vehicle functions may be a part of the safety concept.
2.2. "Electronic control system" means a combination of units, designed to co-operate in the production of the stated vehicle control function by electronic data processing.
 Such systems, often controlled by software, are built from discrete functional components such as sensors, electronic control units and actuators and connected by transmission links. They may include mechanical, electro-pneumatic or electro-hydraulic elements.
 "The System", referred to herein, is the one for which type approval is being sought.
2.3. "Complex electronic vehicle control systems" are those electronic control systems which are subject to a hierarchy of control in which a controlled function may be over-ridden