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Dorman - First Stop Brake Master Cylinder P/N:M630440
$157.99
Convert firm brake-pedal pressure into the hydraulic force that operates your brakes with the Dorman - First Stop Brake Master Cylinder (M630440). It installs as a direct-fit replacement for the 2006-2007 Buick Rainier, 2006-2008 Chevrolet TrailBlazer, 2006 Chevrolet TrailBlazer EXT, 2006-2008 GMC Envoy, 2006 GMC Envoy XL, and 2006-2008 Saab 9-7X (All engines).
The master cylinder pushes glycol-based brake fluid from the reservoir through two outlets and into the brake lines each time you press the pedal. If a worn or leaking original is behind a spongy pedal or a pedal that slowly sinks toward the floor, this replaces it.
- 100% new: built entirely from new materials, not remanufactured.
- Aluminum housing: constructed to match the casting material of the original for similar performance.
- EPDM rubber components: resist glycol-based brake fluid.
- Built to SAE International standards with a 1.063 in bore and two 1/2-20 outlets.
Includes the reservoir and fluid-level sensor; 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: 100-2644 · 1002644 · 13-3273 · 133273 · 10-3273 · 103273 · 130.66055 · 13066055 · 355-47181 · 35547181 · 15142479 · M4105 · MC390983 · F142289 · MC142289. Manufacturer part number M630440.
This part cross-references / interchanges with the following part numbers:
100-2644, 13-3273, 10-3273, 130.66055, 355-47181, 15142479, M4105, MC390983, F142289, MC142289
Frequently Asked Questions
What does this brake master cylinder do?
It converts brake-pedal force into hydraulic pressure, pushing brake fluid from the reservoir through two outlets into the brake lines to operate the brakes.
What vehicles does the M630440 fit?
It's a direct-fit replacement for the 2006-2007 Buick Rainier, 2006-2008 Chevrolet TrailBlazer, 2006 TrailBlazer EXT, 2006-2008 GMC Envoy, 2006 Envoy XL, and 2006-2008 Saab 9-7X (All engines).
Does it include a reservoir and sensor?
Yes. It includes the reservoir and the fluid-level sensor. Mounting hardware is not included.
Is this master cylinder new or remanufactured?
It's 100% new, made entirely from new materials — not remanufactured — and built to meet SAE International standards.
What are signs my master cylinder may need replacing?
A spongy brake pedal, a pedal that slowly sinks toward the floor, or brake fluid leaks may indicate a failing master cylinder. Diagnose the cause before replacing.
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Dorman
Dorman - First Stop Brake Master Cylinder P/N:M630440
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