Dorman - First Stop Brake Master Cylinder P/N:M630791

Turn every press of the pedal into hydraulic braking pressure with the Dorman brake master cylinder M630791 from the First Stop line, a new replacement for a worn or leaking original. It fits many vehicles, among them the 1999-2002 Chevrolet W3500 Tiltmaster, 1998-2002 Chevrolet W4500 Tiltmaster and 1999-2002 GMC W3500 Forward. See the Buyer's Guide tab for the full list.

• Matched to the original: Precision-engineered to match the design, function and performance of the original master cylinder on the listed applications. The cylinder housing is built to match the casting material of the factory part for similar performance.
• Fluid-resistant rubber: Every rubber component uses a high-quality EPDM compound for resistance to glycol-based brake fluid.
• All-new construction: Made entirely of new, high-quality materials for a safe, durable replacement.
• Strict specifications: Built to meet rigorous SAE International standards.

The master cylinder converts force from the brake pedal into hydraulic pressure that travels through the brake lines to the wheels. Signs it may need replacing include a pedal that slowly sinks under steady pressure, a soft or spongy pedal, or brake fluid seeping from the cylinder. Other brake components can cause similar symptoms, so diagnose the cause before replacing. If the master cylinder is the cause, this unit replaces it.

Interchange: 100-4148
1004148 · 97224371 · 8972243710 · F140749 · MC140749