Dorman M390460 Brake Master Cylinder 1.063 in. Bore Aluminum OE Replacement

The Dorman M390460 is a direct-fit, 100% new brake master cylinder engineered as an OE-quality replacement. Featuring a 1.063-inch bore and aluminum construction, this unit is precision-manufactured to replicate the original part's dimensions, hydraulic performance, and mounting configuration for a straightforward, confidence-inspiring installation.

Unlike remanufactured alternatives, the M390460 is built entirely from new materials, including a fresh aluminum cylinder housing and all-new internal seals and rubber components. This ensures consistent hydraulic pressure transfer from pedal to calipers and a reliable, long-lasting repair.

Key Features:

• 1.063 in. bore diameter — matches OE hydraulic specifications for proper pedal feel and braking response
• Aluminum housing — cast to match the material and geometry of the original part for precise fitment
• EPDM rubber components — all seals and cups are made from high-quality EPDM compound, providing superior resistance to glycol-based brake fluids
• 100% new construction — not remanufactured or rebuilt; manufactured from all-new materials for maximum safety and reliability
• Meets SAE International standards — engineered and tested to rigorous industry specifications
• Sold individually

The Dorman M390460 brake master cylinder is part of Dorman's First Stop brake program, delivering the confidence of an OE-matched hydraulic component backed by Dorman's century-long reputation in the automotive aftermarket.