Document ID: chunk:federal_register_of_legislation:F2021C01192:body:0:p45
Version: federal_register_of_legislation:F2021C01192
Segment Type: other
Provision Reference: 
Character Range: 119894–122644

prescribed for service braking when the vehicle is laden. The energy storage device(s) for pneumatic auxiliary equipment shall be isolated.
5.1.1.2.  From an initial speed of not less than 50 km/h, on a surface with a coefficient of adhesion of 0.3[19] or less, the brakes of the laden vehicle shall be fully applied for a time t, during which time the energy consumed by the indirectly controlled wheels shall be taken into consideration and all directly controlled wheels shall remain under control of the anti-lock system.
5.1.1.3.  The vehicle's engine shall then be stopped or the supply to the energy transmission storage device(s) cut off.
5.1.1.4.  The service braking control shall then be fully actuated four times in succession with the vehicle stationary.
5.1.1.5.  When the brakes are applied for the fifth time, it shall be possible to brake the vehicle with at least the performance prescribed for secondary braking of the laden vehicle.
5.1.2.   Additional requirements
5.1.2.1.  The coefficient of adhesion of the road surface shall be measured with the vehicle under test, by the method described in paragraph 1.1. of Appendix 2 to this annex.
5.1.2.2.  The braking test shall be conducted with the engine disconnected and idling, and with the vehicle laden.

5.1.2.3.  The braking time t shall be determined by the formula:

  (but not less than 15 seconds)
  where t is expressed in seconds and vmax represents the maximum design speed of  the vehicle expressed in km/h, with an upper limit of 160 km/h.
5.1.2.4.  If the time t cannot be completed in a single braking phase, further phases may be used, up to a maximum of four in all.
5.1.2.5.  If the test is conducted in several phases, no fresh energy shall be supplied between the phases of the test.
  From the second phase, the energy consumption corresponding to the initial brake application may be taken into account, by subtracting one full brake application from the four full applications prescribed in paragraph 5.1.1.4. (and 5.1.1.5. and 5.1.2.6.) of this annex for each of the second, third and fourth phases used in the test prescribed in paragraph 5.1.1. of this annex as applicable.
5.1.2.6. The performance prescribed in paragraph 5.1.1.5. of this annex shall be deemed to be satisfied if, at the end of the fourth application, with the vehicle stationary, the energy level in the storage device(s) is at or above that required for secondary braking with the laden vehicle.
5.2.  Utilization of adhesion
5.2.1.  The utilization of adhesion by the anti-lock system takes into account the actual increase in braking distance beyond the theoretical minimum. The anti-lock system shall be deemed to be satisfactory when the condition ε ≥ 0.75 is satisfied, where ε