Dorman M630251 Brake Master Cylinder Cast Iron Bore - 1-Inch

The Dorman M630251 is a 100% new brake master cylinder engineered as a direct OEM replacement. Built from cast iron with a 1-inch bore diameter, this unit converts brake pedal pressure into hydraulic pressure to reliably activate the braking system. It is not remanufactured — every component is brand new for maximum safety and peace of mind.

Key Features:

• Precise OEM match — cylinder housing is constructed to match the casting material and dimensions of the original part
• Cast iron construction — durable material matches the OEM specification for long-lasting performance
• High-quality EPDM rubber components — all internal seals and rubber parts resist glycol-based brake fluid for extended service life
• 1-inch bore diameter — engineered to deliver consistent hydraulic pressure output
• Dual outlet design — features two M10 x 1.0 threaded brake line outlets (rearward and secondary)
• Reservoir included — comes complete with a removable brake fluid reservoir
• 100% new construction — not remanufactured, ensuring the highest quality and safety standards
• SAE International standards — manufactured to meet rigorous SAE specifications

Cross-Reference / OEM Part Numbers: MC391339, NM52849, R134730, STC1284, 132849

Dorman's M630251 brake master cylinder delivers a reliable, cost-effective solution for restoring proper brake system function. With over 100 years of aftermarket engineering experience, Dorman provides the coverage and quality professionals and DIYers depend on.