Dorman - First Stop Brake Master Cylinder P/N:M630454

Turn every press of the brake pedal into hydraulic braking pressure with the Dorman First Stop Brake Master Cylinder M630454. It is a direct-fit replacement for many vehicles, among them the 2008 Chevrolet Express 2500, 2008 Chevrolet Express 3500 and 2007-2008 Chevrolet Silverado 2500 HD; see the Buyer's Guide tab for the full list.

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

• Precise replacement: The cylinder housing is constructed to match the original part's casting material for similar performance.
• Durable design: Every rubber component uses a high-quality EPDM compound for resistance to glycol-based brake fluid.
• 100% new: The unit is made entirely of new materials, with a focus on quality and safety.
• Strict specifications: The cylinder is built to meet rigorous SAE International standards.

Specifications

• Master cylinder material: aluminum
• Bore diameter: 36.9 mm
• Number of outlets: 2
• Secondary outlet thread: M12 x 1.0
• Rearward outlet size: M12 x 1.0
• Primary outlet thread pitch: 1 mm
• Reservoir included: yes
• Sensor included: yes
• Mounting hardware: not included
• Country of origin: China

Signs that a master cylinder may need replacing include a soft or sinking brake pedal, brake fluid leaking at the cylinder, and an illuminated brake warning light. Other brake components can cause the same symptoms, so diagnose the system before replacing parts. For the correct fasteners and bleeding procedure, consult the vehicle service information.

Interchange: 100-2647 · 13-3331 · 10-3331 · 10-4305 · 130.66057 · 355-47183
15106442 · 15146189 · 19209189 · NM4183 · MC391082 · F143037 · MC143037 · 1002647 · 133331 · 103331 · 104305 · 13066057 · 35547183