Dorman - First Stop Brake Master Cylinder P/N:M630334

The Dorman – First Stop Brake Master Cylinder M630334 converts brake-pedal effort into the hydraulic pressure that operates the vehicle's braking system. It installs as a direct-fit replacement for a wide range of 2003–2007 Chevrolet and GMC full-size trucks, vans and SUVs — including the 2003-2006 Avalanche 2500, 2003-2007 Express 2500 and Express 3500, 2003-2005 and 2007 Silverado 1500, 2003-2006 Silverado 2500/2500 HD/3500, 2003-2007 Savana 2500 and Savana 3500, 2003-2006 Sierra 2500 HD/3500, and 2003-2006 Yukon XL 2500. Several Classic and HD variants are also covered — see the Buyer's Guide tab for the full list.

• Precision-engineered fit: designed to match the design, function and performance of the original master cylinder on the listed applications.
• Aluminum housing: cast to match the casting material of the original part for similar performance.
• EPDM seals: the rubber components use a high-quality EPDM compound for resistance to glycol-based brake fluid.
• 100% new: made entirely of new materials, not remanufactured, and built to meet SAE International standards.

This unit has a 37 mm bore, two outlets with a 1/2-20 secondary outlet thread, and ships with the reservoir and fluid-level sensor included. Mounting hardware is not included — consult the vehicle service information for the correct fasteners and whether they may be reused. Country of origin: China.

Interchange: 174-791 · 174791 · 100-1403 · 1001403 · 12905 · 13905 · 13-3086 · 133086 · 10-3086 · 103086 · 130.66045 · 131.66045 · MC512700 · 355-47172 · 35547172 · 18047512 · 19209234 · M4094 · NM4094 · MC390818 · F140480 · MC140480. Manufacturer part number M630334.