Turn brake-pedal force into hydraulic pressure for the brakes with the Dorman First Stop Brake Master Cylinder M39413, a 100% new unit with an aluminum housing and an included reservoir. It fits many vehicles, among them the 1981-1983 Jeep Cherokee, 1987-1991 Chevrolet Blazer and 1989-1991 Chevrolet R1500 Suburban (all engines), as a direct-fit replacement for the listed applications. See the Buyer's Guide tab for the full list.
Dorman precision-engineers this master cylinder to match the original unit's design, function and performance. It uses new, high-quality materials for a safe, durable replacement.
- Precise replacement: the aluminum cylinder housing is built to match the original part for similar performance.
- Durable design: all rubber components use a high-quality EPDM compound that resists glycol-based brake fluid.
- 100% new: made entirely of new materials for quality and safety.
- Strict specifications: made to meet rigorous SAE International standards.
Specifications: two outlets; 1/2-20 rearward outlet size; reservoir included; sensor not included; mounting hardware not included. Country of origin: China.
Signs a master cylinder may need replacing include a soft or sinking brake pedal, brake fluid leaking at the cylinder, or a fluid level that keeps dropping. Diagnose the cause first. Then follow the vehicle service information for bleeding and installation.
