BRAKE ACTUATING SYSTEM

摘要

. BRAKE ACTUATING SYSTEM A vehicle braking system comprising fluid actuated brakes, a source of pressurised fluid supplying a fluid service line, and valve means for controlling the application of pressurised fluid to the fluid actuated brakes in response to a change of pressure in the service line and auxiliary braking means comprising a detector having operative and inoperative positions, first control means for acting on the valve means to cause it to apply pressurised fluid to the brakes in response to the detector being in the operative position and independently of any change in pressure in the service line, and second control means associated with a driver controlled reverse selector on the vehicle which permits operation of the valve by the first control means only when the driver controlled selector is in a vehicle reversing condition. In a preferred arrangement, the brakes are released only when the driver controlled reverse selector is not in the vehicle reversing condition and the detector is in the operative position.