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Dorman - First Stop Brake Master Cylinder P/N:M630335
$185.99
Turn brake-pedal effort into the hydraulic pressure your brakes rely on with the Dorman - First Stop Brake Master Cylinder, manufacturer part number M630335. It drops in as a direct-fit replacement for the 2003-2007 Chevrolet Express 3500 and 2003-2007 GMC Savana 3500, restoring the component that feeds pressurized brake fluid to the wheel circuits when you press the pedal.
As the hydraulic heart of the braking system, the master cylinder uses its internal piston(s) and seals to pressurize fluid and send it out to the calipers or wheel cylinders. When the seals wear, that pressure can bleed internally instead of reaching the brakes.
- Core function: converts pedal force into hydraulic pressure to actuate the vehicle's brakes.
- Signs it may need replacing: a pedal that slowly sinks under steady pressure, a spongy or low pedal, or visible fluid seepage at the cylinder body. If a failed master cylinder is the cause, this replaces it.
- Application: a direct-fit replacement for the listed vehicles above.
Interchange: 100-4288 · 1004288 · 130.66045 · 130.66051 · 131.66045 · 355-47178 · 35547178 · 15269590 · 89040423 · NM4094A · MC391026 · F142294 · MC142294. Manufacturer part number M630335.
This part cross-references / interchanges with the following part numbers:
100-4288, 130.66045, 130.66051, 131.66045, 355-47178, 15269590, 89040423, NM4094A, MC391026, F142294, MC142294
Frequently Asked Questions
What does this brake master cylinder do?
It converts the force of your brake pedal into hydraulic pressure, sending pressurized brake fluid out to the wheel circuits to apply the brakes.
Which vehicles does the Dorman M630335 fit?
It is a direct-fit replacement for the 2003-2007 Chevrolet Express 3500 and 2003-2007 GMC Savana 3500. Confirm your vehicle in the Buyer's Guide tab.
What are the signs my master cylinder may need replacing?
A pedal that slowly sinks under steady pressure, a low or spongy pedal, or fluid seepage at the cylinder body. Diagnose the cause before replacing, as other parts can cause these signs.
What part numbers does this master cylinder replace?
It interchanges with 100-4288, 130.66045, 130.66051, 131.66045, 355-47178, 15269590, 89040423, NM4094A, MC391026, F142294 and MC142294.
Should I bleed the system after installing it?
Yes. Bleed the brake hydraulic system after installation and follow the vehicle service information for the correct bleeding procedure and brake fluid specification.
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Dorman - First Stop Brake Master Cylinder P/N:M630335
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