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Dorman - First Stop Brake Master Cylinder P/N:M630778
$128.99
Build firm, dependable brake-pedal pressure with the Dorman First Stop Brake Master Cylinder M630778 — a 100% new hydraulic unit engineered to drop in on the 2005-2007 Cadillac CTS, 2005-2009 Cadillac SRX, and 2005-2008 Cadillac STS (All engines). The master cylinder converts pedal force into the hydraulic pressure that operates the brake system, so a fresh unit helps restore proper pedal feel when the original is worn or leaking.
- Precision-built housing: the aluminum cylinder housing is cast to match the original part's casting material for comparable performance.
- Fluid-resistant seals: all rubber components use a high-quality EPDM compound for resistance to glycol-based brake fluid.
- 100% new, not remanufactured: made entirely of new materials and built to meet rigorous SAE International standards.
- Ready to install: includes the reservoir and sensor, with a 1-inch bore, two outlets, and 1/2-20 rearward and secondary outlet threads. Mounting hardware is not included — consult the vehicle service information for the correct fasteners.
Signs the master cylinder may need replacing include a slowly sinking or spongy brake pedal, or a loss of fluid with no visible external leak. If a failed master cylinder is the cause, this unit replaces it; diagnose the cause before replacing. Country of origin: China.
Interchange: 100-2350 · 1002350 · 13-3161 · 133161 · 10-3161 · 103161 · 130.62138 · 355-46016 · 35546016 · 10367561 · M4081 · MC390908 · F142637 · MC142637. Manufacturer part number M630778.
This part cross-references / interchanges with the following part numbers:
100-2350, 13-3161, 10-3161, 130.62138, 355-46016, 10367561, M4081, MC390908, F142637, MC142637
Frequently Asked Questions
What does this brake master cylinder do?
It converts brake-pedal force into the hydraulic pressure that operates the brakes. Replacing a worn or leaking original with this new unit helps restore proper pedal feel.
Which vehicles does the M630778 fit?
It's a direct-fit application for the 2005-2007 Cadillac CTS, 2005-2009 Cadillac SRX, and 2005-2008 Cadillac STS (All engines). Check the Buyer's Guide tab to confirm your vehicle.
Does it include the reservoir and sensor?
Yes, both the reservoir and sensor are included. Mounting hardware is not included — consult the vehicle service information for the correct fasteners.
What are the bore and outlet specs?
It has a 1-inch bore, two outlets, and 1/2-20 rearward and secondary outlet threads. The cylinder housing is aluminum.
Is this a remanufactured unit?
No. It is 100% new, made entirely of new materials rather than remanufactured, and built to meet rigorous SAE International standards.
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Dorman
Dorman - First Stop Brake Master Cylinder P/N:M630778
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