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Dorman - First Stop Brake Master Cylinder P/N:M630443
$106.99
Keep hydraulic pressure flowing to both brake circuits with the Dorman - First Stop Brake Master Cylinder M630443, which converts brake pedal force into the hydraulic pressure that operates the vehicle's brakes. It drops in as a direct-fit replacement for the 2004-2008 Chevrolet Malibu, 2005-2006 Pontiac G6, and 2007 Saturn Aura (all engines). Dorman precision-engineers this unit to reproduce the design, function, and performance of the original master cylinder on the listed applications.
- 100% new: built entirely from new materials, not remanufactured.
- Aluminum housing: constructed to match the casting material of the original part for similar performance.
- EPDM rubber components: made from a high-quality EPDM compound for resistance to glycol-based brake fluid.
- Built to spec: made to meet rigorous SAE International standards.
It ships with the fluid reservoir and sensor included and has two outlets, a 0.938 in bore, and an M10 x 1.0 secondary/rearward outlet thread with a 1 mm primary outlet thread pitch. Mounting hardware is not included. Country of origin: China.
Interchange: 174-1008 · 1741008 · 100-2346 · 1002346 · 13-3124 · 133124 · 10-3124 · 103124 · 130.62133 · 131.62133 · 355-47092 · 35547092 · 22675995 · M4091 · NM4091 · MC390885 · F143117 · MC143117
Manufacturer part number M630443.
This part cross-references / interchanges with the following part numbers:
174-1008, 100-2346, 13-3124, 10-3124, 130.62133, 131.62133, 355-47092, 22675995, M4091, NM4091, MC390885, F143117, MC143117
Frequently Asked Questions
What vehicles does the M630443 master cylinder fit?
It's a direct-fit replacement for the 2004-2008 Chevrolet Malibu, 2005-2006 Pontiac G6, and 2007 Saturn Aura (all engines). Check the Buyer's Guide tab to confirm your vehicle.
Does it include a reservoir and sensor?
Yes. Per the catalog, the fluid reservoir and sensor are both included. Mounting hardware is not included, so consult the service information for the correct fasteners.
What is this master cylinder made of?
The cylinder housing is aluminum, built to match the original's casting material, and all rubber components use a high-quality EPDM compound for resistance to glycol-based brake fluid.
What are signs the master cylinder may need replacing?
A sinking or spongy brake pedal or brake fluid leaks can point to a failing master cylinder. Diagnose the cause first; if the master cylinder is at fault, this replaces it.
What are the outlet and bore specifications?
It has two outlets and a 0.938 in bore. The secondary/rearward outlet thread is M10 x 1.0, with a 1 mm primary outlet thread pitch.
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Dorman - First Stop Brake Master Cylinder P/N:M630443
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