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Brazel's RV has teamed up with a top manufacturer of precision machined components! Together we have developed an upgraded version of the hydraulic cylinder used on the J71 parking brake system actuator. This parking brake system is used on General Motors P30 Chassis and also on early Workhorse RV P32 Chassis. This replacement cylinder offers a lifetime warranty, and also provides superior reliability with a one piece internal piston design. The piston is made of stainless steel, including the end cap, compared to the brass and steel combination like the factory component. If you have any questions please feel free to call or email us! This upgraded version will be available this summer.