Turn pedal effort into hydraulic brake pressure with the Dorman First Stop Brake Master Cylinder M630794, a direct-fit replacement for the 2002-2007 Chevrolet W4500 Tiltmaster, 2002-2007 GMC W4500 Forward and 2002-2007 Isuzu NPR-HD, all engines. Dorman precision-engineers this master cylinder to match the original unit's design and function on the listed applications, and builds it from new, high-quality materials.
- Precise replacement: the aluminum cylinder housing is constructed to match the original part's housing material 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, with quality and safety in mind.
- Strict specifications: built to meet rigorous SAE International standards.
Specifications: 1.375-inch bore, two outlets, M10 x 1.0 rearward outlet, M12 x 1.0 secondary outlet thread, 1 mm primary outlet thread pitch and four mounting holes.
In the box: the master cylinder and a bleeder kit. The reservoir, cap, push rod, sensor, mounting hardware and mounting bracket are not included; consult the vehicle service information for the correct fasteners and whether the originals may be reused. Country of origin: China.
Signs a master cylinder may need replacing include a spongy or slowly sinking brake pedal and brake fluid leaking at the cylinder. Diagnose the brake system first, since other components can cause the same symptoms.
Interchange: 130.76012
13076012 · 97315167 · 8973151670 · MC391538 · F140753 · MC140753
This part cross-references / interchanges with the following part numbers:
130.76012, 97315167, 8973151670, MC391538, F140753, MC140753
