[F1 ANNEX VI U.K. Parking braking by mechanical locking of the brake cylinders (lock actuators)

Textual Amendments

F1 Substituted by Commission Directive 98/12/EC of 27 January 1998 adapting to technical progress Council Directive 71/320/EEC on the approximation of the laws of the Member States relating to the braking devices of certain categories of motor vehicles and their trailers (Text with EEA relevance).

2. SPECIAL PROVISIONS U.K.

2.1. When the pressure in the locking chamber approaches the level corresponding to mechanical locking, an optical or audible warning system shall be actuated. U.K.

This provision does not apply to trailers. In the case of trailers the pressure corresponding to mechanical locking shall not exceed 4 bar. It shall be possible to achieve parking brake performance after any single failure of the trailer service braking system. In addition, it shall be possible to release the brakes at least three times after the trailer has been uncoupled, the pressure in the supply line being 6,5 bar before the uncoupling. These conditions shall be satisfied when the brakes are adjusted as closely as possible. It shall also be possible to apply and release the parking braking system as specified in Annex I, point 2.2.2.10, when the trailer is coupled to the towing vehicle.

2.2. In the case of brake actuators fitted with a mechanical locking device, the brake actuator shall be capable of being actuated by either of two energy reserves. U.K.

2.3. The locked brake cylinder may only be released if it is certain that the brake can be operated again after such release. U.K.

2.4. In the event of a failure of the source of energy supplying the locking chamber, an auxiliary unlocking device (mechanical or pneumatic, for instance) using, for example, the air in one of the tyres of the vehicle, shall be provided. U.K.

2.5. The control shall be such that, when actuated, it performs the following operations in sequence: it applies the brakes so as to provide the degree of efficiency required for parking braking, locks the brakes in that position and then cancels out the brake-application force.] U.K.