Help keep your brake pedal firm and predictable with the Dorman First Stop Brake Master Cylinder M631051. It is a direct-fit replacement for the 2015-2020 RAM ProMaster City (engine: All). Precision-engineered to match the original master cylinder's design, function, and performance for the listed application, it is built from new, high-quality materials as a safe, durable replacement.
The master cylinder turns pedal force into hydraulic pressure and sends brake fluid through its outlets to the rest of the brake system. If a leaking or internally worn original is the cause of a soft, spongy, or sinking pedal, this unit replaces it.
- Precise replacement: the aluminum cylinder housing is built to match the original part's casting material 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: 1.16 in. bore diameter, 2 outlets with M12 x 1.0 threads, and 2 mounting holes. Country of origin: Taiwan.
In the box: 1 master cylinder, 1 bleeder kit with bleeder hoses, 2 nuts, and a gasket or seal. The reservoir, cap, push rod, sensor, dust boot, mounting bracket, and brake booster are not included.
Interchange: 68269712AA · NM4323 · MC391529
This part cross-references / interchanges with the following part numbers:
68269712AA, NM4323, MC391529
