CLUTCH RELEASED BRAKE LOCK

An automobile clutch, or the like, is adapted to be disengaged by operating either a combination clutch override and brake pedal, or a powered clutch pedal. If an electric push-button switch is operated before the override pedal is operated, the pedal will actuate the parking brake. If this switch is not pushed, operation of the override pedal will disengage the clutch, and will automatically release the parking brake if the latter was previously applied. The powered clutch pedal can be used only when the engine is operating. It controls a valve actuator, which selectively connects a power unit to the vacuum side of the engine manifold. When the pedal is depressed during engine operation, the manifold vacuum first takes up any slack developed in the clutch actuating mechanism and then disengages the clutch until the pedal is released. A non-linear rate of closure dash-pot device controls the reengagement of the clutch faces.