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Dorman - First Stop Brake Master Cylinder P/N:M630028
$147.99
Build hydraulic pressure to both brake circuits with the Dorman - First Stop Brake Master Cylinder M630028. When you press the pedal, this master cylinder converts that force into the hydraulic pressure that operates the brake system. It drops in as a direct-fit replacement for the 1992-2002 Chevrolet C3500HD and GMC C3500HD, plus the 1993-1999 Chevrolet P30 and GMC P3500 (all engines) — precision-engineered to match the design, function, and performance of the original unit.
- 100% new: made entirely of new materials, not remanufactured.
- Aluminum housing: constructed to match the casting material of the original part for similar performance.
- Durable design: all rubber components use a high-quality EPDM compound for resistance to glycol-based brake fluid.
- Strict specifications: made to meet rigorous SAE International standards.
Key specs: 40 mm bore diameter, 2 outlets, and a 1/2-20 secondary outlet thread. The reservoir is included; no sensor and no mounting hardware are included — consult the vehicle service information for the correct fasteners and whether they may be reused. Country of origin: China. If a failed master cylinder is the cause of a sinking pedal or loss of pressure, this replaces it; diagnose the cause before replacing.
Interchange: 174-689 · 174689 · 174-719 · 174719 · 18M949 · 100-2612 · 1002612 · M-86027 · M86027 · 13023 · 13-2608 · 132608 · 13-2754 · 132754 · 10-2608 · 102608 · 10-2754 · 102754 · 130.66027 · MC252680 · 355-47157 · 35547157 · 18017378 · 18021279 · 18029970 · 18060157 · M2608 · M2754 · NM2754 · MC390072 · MC390278 · F140672 · MC140672 · Manufacturer part number M630028.
This part cross-references / interchanges with the following part numbers:
174-689, 174-719, 18M949, 100-2612, M-86027, 13023, 13-2608, 13-2754, 10-2608, 10-2754, 130.66027, MC252680, 355-47157, 18017378, 18021279, 18029970, 18060157, M2608, M2754, NM2754, MC390072, MC390278, F140672, MC140672
Frequently Asked Questions
What vehicles does the M630028 master cylinder fit?
It's a direct-fit replacement for the 1992-2002 Chevrolet and GMC C3500HD and the 1993-1999 Chevrolet P30 and GMC P3500 (all engines). Check the Buyer's Guide tab to confirm your vehicle.
Is the reservoir included?
Yes, the reservoir is included. A sensor and mounting hardware are not included with this master cylinder.
What is the bore diameter and outlet configuration?
The master cylinder has a 40 mm bore diameter with 2 outlets and a 1/2-20 secondary outlet thread.
Is this a remanufactured part?
No. It's 100% new, made entirely of new materials and built to meet rigorous SAE International standards.
What are signs this master cylinder may need replacing?
A brake pedal that slowly sinks to the floor, feels spongy, or loses pressure can indicate a failing master cylinder. Diagnose the cause first, since other components can produce the same symptoms.
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Dorman - First Stop Brake Master Cylinder P/N:M630028
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