A golf cart anti-theft device for locking the brake pedal in the depressed position includes a solenoid member with an extrudable shaft and wedge that is wired into the keyed vehicle on-off switch electrical circuit. When the key is on, the solenoid is activated and the shaft remains in the withdrawn position. When the key is in the off position the solenoid is deactivated and the shaft extrudes to force the wedge against the vehicle break arm solenoid bearing member, brake pedal arm and the vehicle floorboard bottom surface, preventing the brake pedal arm from moving from the depressed position. The device can be retrofitted to existing carts or installed in the original manufacture, and can eliminate the need for a parking brake. The device can also be adapted for an above floorboard installation.