Vehicle antitheft device

A vehicle antitheft device (10) for locking the brakes of a vehicle including a hook member (12) which engages the brake pedal (16) of a vehicle. The hook member (12) is locked (11) through the floorboard (20) by a dead bolt (24) which slides through a guide hole (23) in a locking sleeve (18) which depends from the floorboard (20). The dead bolt (24) further extends through a hole (22) in the shaft (13) of the hook member (12) while the shaft (13) is inside the locking sleeve (18). The dead bolt (24) is engaged by a key-operated push-pull cable (26,28). A brake light cutoff switch (34) is included to prevent brake light operation when the device is in the locked position. A metal box (38) encloses the locking mechanism (11) to protect the system from tampering from underneath the vehicle.