BRAKE LOCK VALVE:
The Brake Lock Valve is perfect for the stick shift drag car. It enables you to prevent the car from rolling in the pits, without the need for a heavy parking brake system. Add the valve in the rear brake line and use your existing disc brakes to hold the car in place. Simply push the pedal down as if you are stopping the car, turn the knob 90 degrees and release the pedal. To release the brakes turn the knob back.