Hydraulic Power Brake Booster For Small Cars

This paper describes a hydraulic power booster which has been developed for small cars and which utilizes the power steering pump as a power source. The unit provides higher master cylinder pressures and lower pedal efforts to aid in meeting regulations set by the National Highway Traffic Safety Administration. In addition, the booster configuration described provides a smaller and lower weight package than similar units and provides a ratio change feature.

Details of the design and operation characteristics of the Midland-Ross Ultrastop hydraulic power brake booster are given including concentric piston design ratio changer.