Abstract: A pre-oil device which uses a positive release catch/latch to allow a spring loaded piston within a resevor chamber to provide oil to an engine before the engine oil pump reaches operational levels. The solenoid which is energized to initiate the pre-oil process incorporates a slip mounting of the core to the positive release catch/latch to enhance the performance of the release and conserve energy. The device also includes an air tight mounting allowing the user to introduce pressurized air to augment the spring loading of the piston during adverse conditions. A secondary piston may be mounted within the main piston. The secondary piston recedes into the main piston under high oil pressure but applies pressure to the oil system to compensate for low pressure of the engine oil system during reduction of speed of the engine and reduced engine oil pump performance.

Abstract: A mechanical arrangement to provide power assistance for the application of vehicle brakes with a positive shut-off of power assistance immediately upon release of the brake control by the user. The shut-off is achieved mechanically by providing pressure relief from the power assist pressure chamber by connecting a pressure relief channel between the power assist chamber and the brake fluid reservoir or by disconnecting the power piston in the power assist chamber from the main piston as soon as the brake control is released by the user.