Brake Master Cylinder for 2003-2005 Chevrolet Silverado 1500 & More - Dorman M630334

Build the hydraulic pressure your brakes rely on with the Dorman First Stop Brake Master Cylinder M630334, the unit that turns force on the brake pedal into hydraulic pressure and sends it through the brake lines. It fits many vehicles, among them the 2003-2005 Chevrolet Silverado 1500, 2003-2005 GMC Sierra 1500 and 2003-2006 Chevrolet Silverado 2500. See the Buyer's Guide tab for the full list. Dorman designed it to match the design, function and performance of the original master cylinder on the listed applications, and built it from new, high-quality materials for a safe, durable replacement.

• Precise replacement: the aluminum cylinder housing matches the casting material of the original part for similar performance.
• Durable design: every rubber component uses a high-quality EPDM compound that resists glycol-based brake fluid.
• 100% new: made entirely from new materials for quality and safety.
• Strict specifications: made to meet rigorous SAE International standards.

Specifications: 37 mm bore, two outlets, and 1/2-20 threads on both the rearward and secondary outlets. The reservoir and a sensor are included. Mounting hardware is not included, so consult the vehicle service information for the correct fasteners and whether the originals may be reused. Country of origin: China.

A soft or sinking pedal, fluid leaks at the master cylinder, or a lit brake warning light may be signs this part needs replacing. Other brake components can cause the same symptoms, so diagnose the cause first. Bleed the brake system after installation as directed by the service procedure.

Interchange: 174-791 · 100-1403 · 13-3086 · 10-3086 · 130.66045 · 131.66045 · 355-47172
174791 · 1001403 · 133086 · 103086 · 13066045 · 13166045 · 35547172 · 12905 · 13905 · MC512700 · 18047512 · 19209234 · M4094 · NM4094 · MC390818 · F140480 · MC140480