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Dorman - First Stop Brake Master Cylinder P/N:M630403
$157.99
Turn brake-pedal effort into the hydraulic pressure that operates the brakes with the Dorman First Stop Brake Master Cylinder M630403. It drops in as a direct-fit replacement for the 2007-2008 Chevrolet Silverado 2500 HD and 3500 HD, the 2007 Chevrolet Silverado 3500, and the 2007-2008 GMC Sierra 2500 HD and 3500 HD (All engines), engineered to match the design, function, and performance of the original master cylinder on those applications.
- 100% new: made entirely of new materials — not remanufactured — for consistent quality and safety.
- Aluminum housing: constructed to match the casting material of the original part for similar performance.
- EPDM seals: the rubber components use a high-quality EPDM compound for resistance to glycol-based brake fluid.
- Ready to plumb: two outlets with M12 x 1.0 outlet threads and a 37 mm bore; the reservoir and sensor are included.
Made to meet rigorous SAE International standards. Mounting hardware is not included — consult the vehicle service information for the correct fasteners and whether they may be reused. Country of origin: China.
Interchange: 100-4293 · 1004293 · 13-4297 · 134297 · 10-4297 · 104297 · 130.66058 · 355-47184 · 35547184 · 15837546 · 19209203 · NM4180 · MC391081 · F1404080 · F143457 · MC1404080 · MC143457
Manufacturer part number M630403.
This part cross-references / interchanges with the following part numbers:
100-4293, 13-4297, 10-4297, 130.66058, 355-47184, 15837546, 19209203, NM4180, MC391081, F1404080, F143457, MC1404080, MC143457
Frequently Asked Questions
What does this brake master cylinder do?
It converts brake-pedal force into hydraulic pressure and sends it through two outlets to the brake circuits. If the original master cylinder has failed, this M630403 replaces it.
Which vehicles does M630403 fit?
It's a direct-fit replacement for the 2007-2008 Chevrolet Silverado 2500 HD and 3500 HD, the 2007 Silverado 3500, and the 2007-2008 GMC Sierra 2500 HD and 3500 HD (All engines). See the Buyer's Guide tab to confirm.
Is this master cylinder new or remanufactured?
It's 100% new, made entirely of new materials — not remanufactured — with an aluminum housing built to match the casting material of the original part.
Does it include a reservoir, sensor, or mounting hardware?
The reservoir and sensor are included. Mounting hardware is not included; consult the vehicle service information for the correct fasteners and whether they may be reused.
What are signs the master cylinder may need replacing?
Signs may include a brake pedal that slowly sinks or feels spongy and brake-fluid leakage at the cylinder. Diagnose the cause first, since other components can produce these symptoms.
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Dorman
Dorman - First Stop Brake Master Cylinder P/N:M630403
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