Convert brake-pedal force into the hydraulic pressure your brakes rely on with the Dorman First Stop Brake Master Cylinder (M630034). It's a direct-fit replacement precision-engineered to match the design, function, and performance of the original master cylinder, dropping into the 2000-2005 Chevrolet Blazer, 2000-2004 Chevrolet S10, 2000-2005 GMC Jimmy, 2000-2004 GMC Sonoma, and 2000-2001 Oldsmobile Bravada (all engines).
- Aluminum housing: built to match the casting material of the original part for similar performance.
- Durable EPDM seals: all rubber components use a high-quality EPDM compound for resistance to glycol-based brake fluid.
- 100% new: made entirely of new materials, not remanufactured, and made to meet rigorous SAE International standards.
- Key specs: 1 in bore diameter, two outlets, 1/2-20 secondary outlet thread; reservoir and sensor included. 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: 174-780 · 174780 · 18M973 · 83-44039 · 8344039 · M901146 · 100-2632 · 1002632 · M-86039 · M86039 · 13546 · 13-2958 · 132958 · 10-2958 · 102958 · 130.66043 · 131.66043 · MC500160 · 355-47170 · 35547170 · 18042802 · 18060793 · NM3068 · NM3097 · MC390571 · F139958 · MC139958. Manufacturer part number M630034.
This part cross-references / interchanges with the following part numbers:
174-780, 18M973, 83-44039, M901146, 100-2632, M-86039, 13546, 13-2958, 10-2958, 130.66043, 131.66043, MC500160, 355-47170, 18042802, 18060793, NM3068, NM3097, MC390571, F139958, MC139958
