Abstract: A vehicle anti-theft system is activated by a magnetically coded card and associated card reader to activate a normally closed solenoid valve which is connected in the brake line to permit normal operation of the vehicle, the valve being closed when unoperated, preventing brake fluid to return to the master cylinder, whereby the brakes of the vehicle are locked, preventing operation of the vehicle. The valve has its fluid inlet connected to the brake line and its fluid outlet connected to the outlet of the master brake cylinder.

Abstract: A vehicle anti-theft system which is activated by a key switch or by a magnetically coded card and associated car reader to activate a latching solenoid valve to one state for disabling functions of the vehicle, preventing operation of the vehicle, or to the opposite state for enabling operation of the vehicle. The system requires a specified voltage at a level higher than the voltage of the vehicle battery to prevent compromising of the system as by the use of jumper cables or the like.