Turn pedal effort into the hydraulic pressure your brakes rely on with the Dorman First Stop Brake Master Cylinder, part number M104458. It fits many vehicles, among them the 1981-1985 Chevrolet Impala, 1981 Chevrolet Camaro and 1981-1990 Chevrolet Caprice with all engines. See the Buyer's Guide tab for the full list. Each listed application uses one master cylinder.
This unit is precision-engineered so its design, function and performance mirror the original master cylinder on the listed applications, and Dorman builds it from new, high-quality materials. If the master cylinder on your 1981-1985 Chevrolet Impala is leaking or worn, this new unit arrives with its reservoir included.
- Precise replacement: the aluminum cylinder housing is built to match the original part's material for similar performance.
- Durable design: every rubber component is made from a high-quality EPDM compound intended to resist 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; rearward outlet size 1/2-20; reservoir included; sensor not included; mounting hardware not included. Country of origin: China.
The master cylinder converts brake pedal force into hydraulic pressure sent through the brake lines. Signs it may need replacing include a spongy or sinking pedal, fluid leaking at the unit, or a falling reservoir level. Diagnose the cause first, because other brake parts can produce these symptoms. A master cylinder is typically bench-bled before installation, and the brake system is bled afterward. Consult the vehicle service information for the procedure, the correct fasteners and whether the originals may be reused.
