Document ID: chunk:federal_register_of_legislation:F2021C00477:body:0:p56
Version: federal_register_of_legislation:F2021C00477
Segment Type: other
Provision Reference: 
Character Range: 147036–149833

shall be calculated from the design braking distribution when deceleration corresponds to the appropriate value given in paragraph 2.1.1.(A) of Annex 3 to this Regulation.
3.2. The initial rotational speed of the inertia dynamometer shall correspond to the linear speed of the vehicle as prescribed in paragraph 2.1.1.(A) of Annex 3 to this Regulation and shall be based on the dynamic rolling radius of the tyre.
3.3. Brake linings shall be at least 80 per cent bedded and shall not have exceeded a temperature of 180°C during the bedding procedure, or alternatively, at the vehicle manufacturer's request, be bedded in accordance with his recommendations.
3.4. Cooling air may be used, flowing over the brake in a direction perpendicular to its axis of rotation. The velocity of the cooling air flowing over the brake shall be not greater than 10 km/h. The temperature of the cooling air shall be the ambient temperature.
4. Test procedure
4.1. Five sample sets of the brake lining shall be subjected to the comparison test; they shall be compared with five sets of linings conforming to the original components identified in the information document concerning the first approval of the vehicle type concerned.
4.2. Brake lining equivalence shall be based on a comparison of the results achieved using the test procedures prescribed in this annex and in accordance with the following requirements.
4.3.  Type-O cold performance test
4.3.1. Three brake applications shall be made when the initial temperature is below 100°C. The temperature shall be measured in accordance with the provisions of paragraph 2.1.4.4. of this annex.
4.3.2. Brake applications shall be made from an initial rotational speed equivalent to that given in paragraph 2.1.1.(A) of Annex 3 to this Regulation, and the brake shall be applied to achieve a mean torque equivalent to the deceleration prescribed in that paragraph. In addition, tests shall also be carried out at several rotational speeds, the lowest being equivalent to 30 per cent of the maximum speed of the vehicle and the highest being equivalent to 80 per cent of that speed.
4.3.3. The mean braking torque recorded during the above cold 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.
4.4. Type-I test (fade test)
4.4.1. Heating procedure
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