Turn every press of the pedal into hydraulic brake pressure with the Dorman brake master cylinder M631048 from Dorman - First Stop. It is a direct-fit replacement for the 2015-2020 Ford Mustang (All engines), precision-engineered to match the original master cylinder's design, function, and performance.
- 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 is made from a high-quality EPDM compound that resists glycol-based brake fluid.
- 100% new: Made entirely of new, high-quality materials for a safe, durable replacement.
- Strict specifications: Built to meet rigorous SAE International standards.
Specifications: 1.0625 in. bore diameter · single reservoir, included with the cap and sensor · 2 outlets · rearward outlet size M14x1.5 · secondary outlet thread diameter M14x1.5 · primary outlet thread pitch 1.5 mm · 2 mounting holes. Mounting hardware, mounting bracket, push rod, brake booster and bleeder hoses are not included. Country of origin: China.
Signs a Mustang master cylinder may need replacing include a soft or sinking pedal, fluid leaking at the unit, or a brake warning light. Other brake components can cause these same symptoms, so diagnose the cause before replacing.
Interchange: 100-3976
1003976 · FR3Z2140D · NM4296 · MC391531
This part cross-references / interchanges with the following part numbers:
100-3976, FR3Z2140D, NM4296, MC391531
