Turn brake-pedal force into the hydraulic pressure that operates the brake circuits with the Dorman - First Stop Brake Master Cylinder, MPN M631051. It's a direct-fit replacement for the 2015-2020 RAM ProMaster City (All engines), engineered to match the design, function, and performance of the original master cylinder on this application.
- 100% new: made entirely of new materials, not remanufactured, and built to meet SAE International standards.
- Precise replacement: the aluminum cylinder housing is constructed to match the original part's casting material for similar performance. Bore diameter is 1.16 in, with two outlets threaded M12 x 1.0.
- Durable design: all rubber components use a high-quality EPDM compound for resistance to glycol-based brake fluid.
The box contains the master cylinder, two nuts, and a bleeder kit with bleeder hoses; a gasket/seal is included. The reservoir, master cylinder cap, push rod, brake booster, sensor, dust boot, and mounting bracket are not included — transfer or replace those as directed by the service procedure. Signs a master cylinder may need replacing include a sinking or spongy pedal or brake-fluid leaks; diagnose the cause first, and if a failed master cylinder is the cause, this unit replaces it. Country of origin: Taiwan.
Interchange: 68269712AA · NM4323 · MC391529. Manufacturer part number M631051.
This part cross-references / interchanges with the following part numbers:
68269712AA, NM4323, MC391529
