Document ID: chunk:federal_register_of_legislation:F2010C00150:front:0:p30
Version: federal_register_of_legislation:F2010C00150
Segment Type: other
Provision Reference: 
Character Range: 81468–84379

electric braking component under the minimal and maximum conditions of delivered braking force.  This requirement is not applicable if the vehicle is equipped with an anti-lock device which controls the wheels connected to the electric braking then the requirements of annex 6 to this Regulation shall apply.

         4. REQUIREMENTS TO BE MET IN CASE OF FAILURE OF THE BRAKING DISTRIBUTION SYSTEM

          When the requirements of this annex are fulfilled by means of a special device (e.g. controlled mechanically by the suspension of the vehicle), it shall be possible, in the event of the failure of its control, (e.g. by disconnecting the control linkage), to stop the vehicle under the conditions of the Type-0 test with the engine disconnected to give a stopping distance not exceeding 0.1v + 0.0100v2 (m) and a mean fully developed deceleration not less than 3.86m/s2.

5. VEHICLE TESTING

          During the type-approval testing of a vehicle, the technical inspection authority shall verify conformity with the requirements contained in the present annex, by carrying out the following tests:

5.1. wheel-lock sequence test (see appendix 1)

          If the wheel-lock sequence test confirms that the front wheels lock before or simultaneously with the rear wheels, conformity with paragraph 3. of this annex has been verified and testing is complete.

5.2. Additional tests

         If the wheel-lock sequence test indicates that the rear wheels lock before the front wheels, then the vehicle:

 (a)  will be subjected to additional testing as follows:

 (i)  additional wheel-lock sequence tests; and/or

          (ii)  torque wheel tests (see appendix 2) to determine brake factors  to generate adhesion  utilization  curves;  these  curves  must  satisfy  the  requirements  in paragraph 3.1. (A) of this annex.

 (b)  may be refused type-approval.

         5.3. The results of the practical tests shall be appended to the type-approval report.

6. CONFORMITY OF PRODUCTION

         6.1. When checking vehicles for conformity of production, the Technical Services should follow the same procedures as for type-approval.

         6.2. The requirements shall also be the same as for type-approval, except that in the test described in paragraph 5.2. (a) (ii) of this annex, the rear axle curve must lie below the line z = 0.9k for all braking rates between 0.15 and 0.8 (instead of meeting the requirement in paragraph 3.1. (A) (see diagram 2) .

DIAGRAM  1

DIAGRAM  2

Annex 5 - Appendix 1

WHEEL - LOCK SEQUENCE TEST PROCEDURE

1. GENERAL INFORMATION

         (a) The purpose of this test is to ensure that lockup of both front wheels occurs at a lower deceleration rate than the lockup of both rear wheels when tested on road surfaces on which wheel lockup occurs at braking rates between 0.15 and 0.8m/ s2.

         (b) A simultaneous lockup of the front and rear wheels refers to