Turn brake-pedal force into hydraulic pressure for the brake system with the Dorman First Stop Brake Master Cylinder, part number M39639. It is a direct-fit replacement for many vehicles, among them the 1982-1989 Dodge Colt, 1986-1989 Hyundai Excel and 1983-1989 Plymouth Colt; see the Buyer's Guide tab for the full list.
Dorman precision-engineers this master cylinder to replicate the original unit's design, function and performance on the listed applications. It uses new, high-quality materials for a safe, durable replacement.
- Precise replacement: the aluminum cylinder housing is built to match the casting material of the original part for similar performance.
- Durable design: every rubber component uses 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: 0.813 in. bore diameter; two outlets; rearward outlet size M10 x 1.0; secondary outlet thread M10 x 1.0; primary outlet thread pitch 1 mm; reservoir included; sensor included; mounting hardware not included. Package contents: master cylinder. Country of origin: China.
Signs a master cylinder may need replacing include a soft or sinking brake pedal, fluid leaking at the cylinder, or a brake fluid level that keeps dropping. These symptoms can have other causes, so diagnose the brake system first. If a failed master cylinder is the cause, this unit replaces it. After installation, bleed the brakes according to the vehicle service information.
