device in a vehicle with a compressed air brake system for the use of the braking system to detect an obstacle in the path of the vehicle by a feeler.

摘要

Compressed air brakes on a vehicle are actuated by an obstacle sensor switch via electromagnetic valves to draw compressed air from both parking and service brake compressed air supplies for operation of the service brakes to avoid depletion of the service brake air supply. Also, the parking brake cylinder may be rapidly emptied from control of the obstacle sensor by means of a rapid empty valve connected to the brake cylinders of the parking brake circuit.