Brake Release Switch & Valve

All models use two methods of disengaging system once it has been activated. When brake pedal is depressed, an electric release switch at brake pedal disengages solenoid in transducer, venting system vacuum to atmosphere through filter. Operation of engagement switch is required to reactivate system. If electric valve fails, a vacuum dump valve is also mounted at brake pedal and vents servo vacuum to atmosphere returning throttle to idle position.