Convert brake-pedal effort into the hydraulic pressure that operates your brakes with the Dorman - First Stop Brake Master Cylinder M630021. It drops in as a direct-fit replacement for the 1998-2000 Chevrolet Blazer and Oldsmobile Bravada, plus the 1998-1999 Chevrolet S10, GMC Jimmy, GMC Sonoma, and Isuzu Hombre (All engines), and is precision-engineered to match the design, function, and performance of the original unit on those applications.
The master cylinder converts the force from your brake pedal into hydraulic pressure sent to the brake circuits. If a leaking or worn master cylinder is the cause of a slowly sinking pedal, a spongy feel, or fluid seepage at the cylinder, this replaces it — diagnose the cause before replacing. Consult the vehicle service information for the correct mounting fasteners and whether they may be reused. Country of origin: China.
Interchange: 174-750 · 174750 · 18M937 · M901145 · 100-2626 · 1002626 · M-86037 · M86037 · 13544 · 13-2866 · 132866 · 10-2866 · 102866 · 130.66037 · MC500110 · 355-47165 · 35547165 · 18026274 · 8180262740 · M3068 · M3097 · NM3068 · NM3097 · MC390427 · F140131 · MC140131. Manufacturer part number M630021.
This part cross-references / interchanges with the following part numbers:
What does this brake master cylinder do?
It converts the force from your brake pedal into hydraulic pressure, sending it through two outlets to operate the vehicle's brake circuits.
Does it include a reservoir?
Yes, the reservoir is included. A sensor is not included, and mounting hardware is not included either.
Is this a new or remanufactured cylinder?
It is 100% new, made entirely of new materials rather than remanufactured, and its rubber components use an EPDM compound resistant to glycol-based brake fluid.
Which vehicles does M630021 fit?
It's a direct-fit replacement for the 1998-2000 Chevrolet Blazer and Oldsmobile Bravada, and the 1998-1999 Chevrolet S10, GMC Jimmy, GMC Sonoma, and Isuzu Hombre (All engines).
What are the bore and outlet specs?
The cylinder has a 1-inch bore and two outlets, including a 1/2-20 rearward outlet, with an aluminum housing.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.