Document ID: chunk:federal_register_of_legislation:F2021C00476:body:0:p16
Version: federal_register_of_legislation:F2021C00476
Segment Type: other
Provision Reference: 
Character Range: 43789–46814

per cent of the nominal value at 2 m/sec2 for decelerations below this rate.

         5.2.8.2. Compensation as defined above, is permitted only when the initial brake application is made at vehicle speeds greater than 10 km/h.

         5.2.9. Malfunctions of the electric control transmission shall not apply the brakes contrary to the driver's intentions.

         5.2.10. The service, secondary and parking braking systems must act on braking surfaces connected to the wheels through components of adequate strength.

          Where braking torque for a particular axle or axles is provided by both a friction braking system and an electrical regenerative braking system of category B, disconnection of the latter source is permitted, providing that the friction braking source remains permanently connected and able to provide the compensation referred to in paragraph 5.2.7.1.

          However, in the case of short disconnection transients, incomplete compensation is accepted, but within 1s, this compensation shall have attained at least 75 per cent of its final value.

          Nevertheless, in all cases, the permanently connected friction braking source shall ensure that both the service and secondary braking systems continue to operate with the prescribed degree of effectiveness.

          Disconnection of the braking surfaces of the parking braking system shall be permitted only on condition that the disconnection is controlled exclusively by the driver from his driving seat, by a system incapable of being brought into action by a leak.

         5.2.11. Wear of the brakes must be capable of being easily taken up by means of a system of manual or automatic adjustment.  In addition, the control and the components of the transmission and of the brakes must possess a reserve of travel and, if necessary, suitable means of compensation such that, when the brakes become heated, or the brake linings have reached a certain degree of wear, effective braking is ensured without immediate adjustment being necessary.

         5.2.11.1. Wear adjustment shall be automatic for the service brakes.  Automatic wear adjustment devices shall be such that after heating followed by cooling of the brakes, effective braking is still ensured.  In particular the vehicle shall remain capable of normal running after the tests conducted in accordance with Annex 3, paragraph 1.5. (Type-I test).

         5.2.11.2. Checking the wear of the service brake friction components

         5.2.11.2.1. It shall be possible to easily assess this wear on service brake linings from the outside or underside of the vehicle, without the removal of the wheels, by the provision of appropriate inspection holes or by some other means.  This may be achieved by utilizing simple standard workshop tools or common inspection equipment for vehicles.

          Alternatively, a sensing device per wheel (twin wheels are considered as a single wheel), which will warn the driver at his driving position when lining replacement