Dorman - First Stop Brake Master Cylinder P/N:M630441

Turn brake-pedal effort into the hydraulic pressure your braking system depends on with the Dorman - First Stop Brake Master Cylinder M630441. It drops in as a direct-fit replacement for the 2006-2008 Buick Lucerne [All] and the 2006-2008 Cadillac DTS [All], pressurizing the brake fluid and sending it out to the vehicle's hydraulic circuits when you press the pedal.

Dorman precision-engineers this unit to match the original master cylinder's design, function, and performance on the listed years, makes and models, so it works like the part it replaces.

• 100% new: made entirely of new materials, not remanufactured.
• Aluminum housing: cast to match the casting material of the original part for similar performance.
• Durable seals: rubber components use a high-quality EPDM compound for resistance to glycol-based brake fluid.
• Built to spec: made to meet SAE International standards.

Details: aluminum construction, 1-inch bore, 2 outlets with M13 x 1.5 outlet threads (1.5 mm pitch). Reservoir and sensor are included. Mounting hardware is not included — consult the vehicle service information for the correct fasteners and whether they may be reused. If a failed master cylinder is the cause of a sinking or spongy pedal or an external fluid leak, this replaces it. Country of origin: China.

Interchange: 174-1134 · 1741134 · 100-2353 · 1002353 · 13-3282 · 133282 · 13-3282A · 133282A · 130.62141 · 13062141 · 355-45020 · 35545020 · 15283583 · 19209200 · M4087 · M4088 · NM4087A · NM4088 · MC391079 · F142296 · MC142296 · Manufacturer part number M630441.