Abstract: This invention relates to a selectively operable control system for use on an automotive vehicle to insure that the brakes of the vehicle will be locked after the engine has been turned off so as to prevent the vehicle from being stolen. The system includes a valve with a bidirectional motor and a control circuit for bidirectionally energizing the motor. The valve is established in an open position for normal braking only when an electronic key is inserted in a receptacle, and in a closed anti-theft position having check valve characteristics when the key is not inserted.

Abstract: This invention relates to a control system for use on an automotive vehicle in conjunction with a valve in the vehicle's hydraulic brake system to control certain aspects of the braking operation. Preferably, the present control system insures that the brakes will be locked to prevent the vehicle from creeping forward after being braked to a stop, such as at a stop light. Also, the present control system preferably insures that the brakes will be locked after the engine has been turned off, so as to prevent the car from being stolen.