If a worn master cylinder is behind a soft or sinking brake pedal, the Dorman First Stop Brake Master Cylinder M630556 is a new replacement designed to convert pedal force into hydraulic pressure for the brake circuits. It is a direct-fit replacement for the 2009-2018 Chevrolet Express 2500, 3500 and 4500, the 2009-2018 GMC Savana 2500 and 3500, and the 2009-2014 Chevrolet Silverado 2500 HD/3500 HD and GMC Sierra 2500 HD/3500 HD. It also fits the other applications listed below.
Dorman precision-engineers it to replicate the original master cylinder's design, function and performance on the listed vehicles. It uses new, high-quality materials for a safe, durable replacement.
- Precise replacement: The aluminum cylinder housing is constructed to match 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: It is made entirely from new materials for quality and safety.
- Strict specifications: It is made to meet rigorous SAE International standards.
Specifications: bore diameter 1.5 in · 2 outlets · secondary outlet thread diameter M14 x 1.5 · primary outlet thread pitch 1.5 mm · rearward outlet size M14 x 1.5 · reservoir included · sensor included · mounting hardware not included · country of origin: China. The package contains one master cylinder.
Signs a master cylinder may need replacing include a soft, spongy or slowly sinking brake pedal, fluid leaking at the master cylinder, or an illuminated brake warning light. Other brake faults can cause the same symptoms, so diagnose the cause before replacing. After installation, bleed the brake system as directed by the vehicle service information.
Fitment (engine: All; quantity 1 per vehicle):
- 2009-2018 Chevrolet Express 2500
- 2009-2018 Chevrolet Express 3500
- 2009-2018 Chevrolet Express 4500
- 2009-2014 Chevrolet Silverado 2500 HD
- 2009-2014 Chevrolet Silverado 3500 HD
- 2009-2013 Chevrolet Suburban 2500
- 2009-2018 GMC Savana 2500
- 2009-2018 GMC Savana 3500
- 2009-2016 GMC Savana 4500
- 2009-2014 GMC Sierra 2500 HD
- 2009-2014 GMC Sierra 3500 HD
- 2009-2013 GMC Yukon XL 2500
- 2014 Chevrolet Silverado 2500
- 2015-2018 Chevrolet Express Cargo
- 2015-2018 Chevrolet Express Pasajeros
Interchange: 100-3729 · 13-4117 · 10-4117 · 130.66070 · 355-47196
1003729 · 134117 · 104117 · 13066070 · 35547196 · 15935845 · NM4216 · NM4216A · MC391184 · F144393 · MC144393
This part cross-references / interchanges with the following part numbers:
100-3729, 13-4117, 10-4117, 130.66070, 355-47196, 15935845, NM4216, NM4216A, MC391184, F144393, MC144393
