Document ID: chunk:federal_register_of_legislation:F2021C00477:body:0:p42
Version: federal_register_of_legislation:F2021C00477
Segment Type: other
Provision Reference: 
Character Range: 111619–114455

curves for the front and rear axles calculated by the formulae:

 The curves shall be plotted for both the following load conditions:
3.2.1. unladen, in running order with the driver on board;
3.2.2. laden; where provision is made for several possibilities of load distribution, the one whereby the front axle is the most heavily laden shall be the one considered;
3.2.3. for vehicles fitted with an electric regenerative braking system of category B, where the electric regenerative braking capacity is influenced by the electric state of charge, the curves shall be plotted by taking account of the 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
0.1 v + 0.0100 v2 (m) and a mean fully developed deceleration not less than 3.86 m/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 = 0.9