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Dorman - First Stop Brake Master Cylinder P/N:M630037
$137.99
Deliver firm, consistent hydraulic pressure to your brake system with the Dorman - First Stop Brake Master Cylinder M630037. Precision-engineered to match the design, function, and performance of the original master cylinder, it drops in as a direct-fit replacement for the 2002-2005 Chevrolet TrailBlazer and TrailBlazer EXT, 2002-2005 GMC Envoy and Envoy XL, 2002-2004 Oldsmobile Bravada, 2003-2004 Isuzu Ascender, 2004-2005 Buick Rainier, 2004-2006 Chevrolet SSR, 2004-2005 GMC Envoy XUV, and 2005 Saab 9-7X (All engines). The master cylinder converts brake-pedal force into hydraulic pressure and routes it through its two outlets to the brake circuits.
- Aluminum housing: the cylinder housing is constructed to match the casting material of the original part for similar performance, with a 1 in bore and a 1/2-20 secondary outlet thread.
- Durable EPDM seals: all rubber components are made of a high-quality EPDM compound for resistance to glycol-based brake fluid.
- 100% new: made entirely of new materials, not remanufactured, and built to meet rigorous SAE International standards.
- Reservoir and sensor included: ships with the reservoir and sensor; mounting hardware is not included — consult the vehicle service information for the correct fasteners and whether they may be reused.
If a failed master cylinder is the cause of a sinking or spongy brake pedal, this replaces it. Package contents: master cylinder. Country of origin: China.
Interchange: 174-775 · 174775 · 100-2633 · 1002633 · 13558 · 13-2921 · 132921 · 10-2921 · 102921 · 130.66044 · 131.66044 · MC500230 · 355-47171 · 35547171 · 18044393 · 18060788 · 8180458170 · M3095 · NM3095 · MC390697 · F140062 · MC140062 · Manufacturer part number M630037
This part cross-references / interchanges with the following part numbers:
174-775, 100-2633, 13558, 13-2921, 10-2921, 130.66044, 131.66044, MC500230, 355-47171, 18044393, 18060788, 8180458170, M3095, NM3095, MC390697, F140062, MC140062
Frequently Asked Questions
What does the M630037 master cylinder do?
It converts brake-pedal force into hydraulic pressure and delivers it through its two outlets to the brake circuits. It has a 1 in bore and a 1/2-20 secondary outlet thread.
Does it come with a reservoir and sensor?
Yes. This master cylinder ships with the reservoir and sensor included. Mounting hardware is not included.
Is it new or remanufactured?
It is 100% new, made entirely of new materials — not remanufactured — and built to meet SAE International standards. The rubber components use an EPDM compound resistant to glycol-based brake fluid.
What vehicles does this fit?
Direct-fit for the 2002-2005 Chevrolet TrailBlazer/EXT, GMC Envoy/XL, Oldsmobile Bravada, Isuzu Ascender, Buick Rainier, Chevrolet SSR, GMC Envoy XUV, and 2005 Saab 9-7X. See the Buyer's Guide tab for the full list.
What are signs the master cylinder may need replacing?
Signs may include a brake pedal that slowly sinks to the floor, a spongy pedal, or a loss of hydraulic pressure. Diagnose the cause before replacing.
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Dorman - First Stop Brake Master Cylinder P/N:M630037
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