A CONTROL APPARATUS FOR CONTROLLING A BRAKE OF A UNIT HAULED BY A VEHICLE

摘要

A control apparatus is designed for controlling a brake of a unit hauled by a vehicle. The vehicle comprises: a plurality of brakes (55, 57) for braking the wheels of the vehicle; a trailer brake (71) for braking the hauled unit; a parking brake for keeping the vehicle braked while it is stationary. The control apparatus comprises: a line (9) for sending a fluid to the trailer brake (71) through a control valve (TBV), in order to brake the hauled unit in certain working conditions; a further line (72) for sending a further fluid to the trailer brake (71) in order to activate the trailer brake (71) in other working conditions; a valve device (75) for controlling flow of the further fluid in the further line (72), the valve device (75) being responsive to a signal indicative of the status of the parking brake.