Dorman M630555 Brake Master Cylinder OE Replacement

The Dorman M630555 is a 100% new replacement brake master cylinder engineered to restore proper hydraulic braking function. Unlike remanufactured alternatives, this unit is built entirely from new components, ensuring consistent quality and long-term reliability right out of the box.

The cylinder housing is cast to match the original equipment specification, delivering a direct-fit installation with no modification required. All internal rubber components are manufactured from high-quality EPDM compound, providing excellent resistance to glycol-based brake fluids and long-term sealing durability. The unit is built to meet rigorous SAE International standards, giving drivers and technicians confidence in its performance and safety.

Key Features:

• 100% new construction — not remanufactured, for maximum quality and safety
• OE-matched housing — cylinder casting mirrors the original part's material and geometry for precise fit
• EPDM rubber seals — resistant to glycol-based brake fluid for extended service life
• SAE-compliant — manufactured to meet SAE International engineering standards
• Direct replacement — engineered to match original design, function, and performance

Dorman is a U.S.-based automotive parts manufacturer headquartered in Colmar, Pennsylvania, with over 100 years of experience supplying the aftermarket. The M630555 is a trusted solution for restoring safe, reliable braking performance.