Turn pedal effort into the hydraulic pressure your brakes rely on with this Dorman brake master cylinder, part number M630364 from the Dorman - First Stop line. It fits many vehicles, among them the 2005-2008 Chevrolet Uplander, 2005-2009 Pontiac Montana and 2005-2007 Buick Terraza, as a direct-fit replacement for the listed applications. See the "Vehicles it fits" section for the full list and engine details.
This Dorman master cylinder is precision-engineered to mirror the design, function and performance of the original master cylinder on the listed applications. It is built from new, high-quality materials for a safe, durable replacement.
- Precise replacement: the cylinder housing is constructed to match the casting material of the original part for similar performance.
- Durable design: every rubber component uses a high-quality EPDM compound that resists glycol-based brake fluid.
- 100% new: made entirely of new materials for quality and safety.
- Strict specifications: made to meet rigorous SAE International standards.
Signs a master cylinder may need replacing include a spongy or sinking brake pedal, brake fluid leaking around the master cylinder, or an illuminated brake warning light. If a failed master cylinder is the cause, this unit replaces it. Diagnose the brake system first, then bench-bleed the unit and bleed the brakes as directed by the vehicle service information.
Interchange: 100-2643 · 13-3247 · 10-3247 · 130.66054 · 355-52019
15189238 · M4086 · NM4086 · MC391010 · F142619 · MC142619 · 1002643 · 133247 · 103247 · 13066054 · 35552019
This part cross-references / interchanges with the following part numbers:
100-2643, 13-3247, 10-3247, 130.66054, 355-52019, 15189238, M4086, NM4086, MC391010, F142619, MC142619
Frequently Asked Questions
What does a brake master cylinder do?
It converts the force from your foot on the brake pedal into hydraulic pressure. That pressure sends brake fluid through the lines to apply the brakes at each wheel.
Which vehicles does the Dorman M630364 fit?
It fits many vehicles, including the 2005-2008 Chevrolet Uplander, 2005-2009 Pontiac Montana and 2005-2007 Buick Terraza. Check the "Vehicles it fits" section to confirm your exact vehicle.
What are the rubber components made of?
All rubber components are made of a high-quality EPDM compound, chosen for its resistance to glycol-based brake fluid.
Does the master cylinder need to be bled during installation?
Master cylinders are typically bench-bled before installation, and the brake system is bled afterward. Follow the vehicle service information for the correct procedure.
What are signs of a failing brake master cylinder?
Common signs include a spongy or sinking brake pedal, fluid leaks near the master cylinder, or a brake warning light. Other parts can cause these symptoms, so have the brake system diagnosed first.
