The TRW Power Brake Booster - PSA957 is a high-performance brake booster that provides superior stopping power and control. It is designed with a unique dual-diaphragm design that provides consistent and reliable braking, even in the most extreme conditions. It also features a large, adjustable piston that allows for precise control and adjustability. This power brake booster is ideal for off-road and performance vehicles, as it provides superior stopping power and control. It is also built to last, with a durable construction and corrosion-resistant components. With the TRW Power Brake Booster - PSA957, you can be sure that you are getting the best in braking performance.