Dorman - First Stop Brake Master Cylinder P/N:M630793

Keep hydraulic pressure moving to every wheel with the Dorman First Stop Brake Master Cylinder M630793, a new unit that turns brake-pedal effort into line pressure. It is a direct-fit replacement for these applications (all engines): the 1998 and 2002-2007 Isuzu NPR, 2002-2007 Chevrolet W3500 and W4500 Tiltmaster, 2002-2007 GMC W3500 and W4500 Forward, and 2002-2007 Isuzu NPR-HD. Each listed application uses one per vehicle.

Dorman precision-engineered this master cylinder to replicate the original unit's design, function and performance on the listed applications. It uses new, high-quality materials for a safe, durable replacement.

• Precise replacement: the cast-iron 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: made entirely of new materials for quality and safety.
• Strict specifications: built to meet rigorous SAE International standards.

Specifications: 1.25 in. bore diameter · 2 outlets · M10 x 1.0 rearward outlet size · 1/2-20 secondary outlet thread diameter · 4 mounting holes · single reservoir type.

In the box: the master cylinder and a bleeder kit. The reservoir, master cylinder cap, push rod, brake booster, sensor, mounting bracket and mounting hardware are not included. Consult the vehicle service information for the correct fasteners and whether they may be reused.

A soft or sinking brake pedal, brake fluid leaking at the cylinder, or a lit brake warning light can be signs that a master cylinder may need replacing. Air in the system, a leaking brake line or another hydraulic component can cause similar symptoms, so diagnose the cause before replacing the master cylinder.

Country of origin: China.

Interchange: 100-3913 · 11-3971 · 130.76010 · 355-47205
1003913 · 113971 · 13076010 · 35547205 · 97315166 · 8973151660 · MC391472 · F140752 · MC140752