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Dorman - First Stop Brake Master Cylinder P/N:M630275
$186.99
Convert brake-pedal effort into the hydraulic pressure that operates the brakes with the Dorman - First Stop Brake Master Cylinder M630275. It installs as a direct-fit replacement for the 2003-2004 Chevrolet C4500 Kodiak and 2003-2004 GMC C4500 Topkick (All engines), engineered to match the design, function, and performance of the original master cylinder on those applications.
- 100% new, not remanufactured: built entirely from new materials to help ensure consistent quality and safety.
- EPDM rubber components: internal rubber parts use a high-quality EPDM compound for resistance to glycol-based brake fluid.
- 40 mm bore, two outlets: aluminum housing constructed to match the casting material of the original part, with a 1/2-20 secondary outlet thread.
- SAE-standard build: made to meet rigorous SAE International standards.
The assembly includes the fluid reservoir and a 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 pedal or unexplained brake-fluid loss, this replaces it. Made in China.
Interchange: 174-774 · 174774 · 100-3029 · 1003029 · 13-3798 · 133798 · 10-3798 · 103798 · 130.66064 · 13066064 · 355-47190 · 35547190 · 15092396 · 18046692 · MC390850 · R135577 · Manufacturer part number M630275
This part cross-references / interchanges with the following part numbers:
174-774, 100-3029, 13-3798, 10-3798, 130.66064, 355-47190, 15092396, 18046692, MC390850, R135577
Frequently Asked Questions
What does this brake master cylinder do?
It converts the force applied at the brake pedal into hydraulic pressure that is distributed through the brake circuits to apply the vehicle's brakes.
Which vehicles does the M630275 fit?
It is a direct-fit replacement for the 2003-2004 Chevrolet C4500 Kodiak and 2003-2004 GMC C4500 Topkick (All engines). See the Buyer's Guide tab to confirm your vehicle.
Does it include a reservoir and sensor?
Yes. Per the catalog, this master cylinder comes with the fluid reservoir and a sensor included. The package contents are the master cylinder assembly.
Is mounting hardware included?
No. Mounting hardware is not included; consult the vehicle service information for the correct fasteners and whether they may be reused.
What are signs my master cylinder may need replacing?
A brake pedal that slowly sinks or feels spongy, or unexplained brake-fluid loss, may be signs of a failing master cylinder. Diagnose the cause before replacing.
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Dorman - First Stop Brake Master Cylinder P/N:M630275
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