Document ID: chunk:federal_register_of_legislation:F2010C00150:front:0:p42
Version: federal_register_of_legislation:F2010C00150
Segment Type: other
Provision Reference: 
Character Range: 112510–115289

of adhesion (kH  and kL) of the high-  and low-adhesion  surfaces, respectively, shall be determined in accordance with the provisions in paragraph 1.1. of appendix 2 to this annex.

1.3. The braking rate (zMALS) for laden vehicles shall be:

Annex 6 - Appendix 4

METHOD OF SELECTION OF THE LOW ADHESION SURFACE

         1. Details of the coefficient of adhesion of the surface selected, as defined in paragraph 5.1.1.2. of this annex, must be given to the Technical Service.

         1.1. These data must include a curve of the coefficient of adhesion versus slip (from 0 to 100% slip) for a speed of approximately 40km/h.

         1.1.1. The maximum value of the curve will represent kpeak and the value at 100% slip will represent klock

1.1.2. The ratio R shall be determined as the quotient of the kpeak and klock.

1.1.3. The value of R shall be rounded to one decimal place.

1.1.4. The surface to be used must have a ratio R between 1.0 and 2.0[1/].

         2. Prior to the tests, the Technical Service shall ensure that the selected surface meets the specified requirements and shall be informed of the following:

 test method to determine R,

 type of vehicle,

          axle load and tyres (different loads and different tyres have to be tested and the results shown to the Technical Service which will decide if they are representative for the vehicle to be approved).

2.1. The value of R shall be mentioned in the test report.

          The calibration of the surface has to be carried out at least once a year with a representative vehicle to verify the stability of R.

Annex 7

INERTIA DYNAMOMETER TEST METHOD FOR BRAKE LININGS

1. GENERAL

         1.1. The procedure described in this annex may be applied in the event of a modification of vehicle type resulting from the fitting of brake linings of another type to vehicles which have been approved in accordance with this Regulation.

         1.2. The alternative types of brake linings shall be checked by comparing their performance with that obtained from the brake linings with which the vehicle was equipped at the time of approval and conforming to the components identified in the relevant information document, a model of which is given in annex 1 to this Regulation.

         1.3. The Technical Authority responsible for conducting approval tests may at its discretion require comparison of the performance of the brake linings to be carried out in accordance with the relevant provisions contained in annex 3 to this Regulation.

         1.4. Application for approval by comparison shall be made by the vehicle manufacturer or by his duly accredited representative.

         1.5. In the context of this annex "vehicle" shall mean the vehicle type approved according to this Regulation