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Dorman - First Stop Brake Master Cylinder P/N:M390267
$120.99
Convert brake-pedal force into the hydraulic pressure that feeds both brake circuits with the Dorman - First Stop Brake Master Cylinder (M390267). It drops in as a direct-fit replacement for the 1995-1999 Cadillac DeVille, 1995-2002 Cadillac Eldorado, 1995-2004 Cadillac Seville, 1996-1999 Buick LeSabre, 1996-2003 Buick Park Avenue, 1996-1999 Oldsmobile 88, 1996 Oldsmobile 98, 1996-1999 Oldsmobile LSS, 1997-1998 Oldsmobile Regency and 1996-1999 Pontiac Bonneville (All engines) — see the Buyer's Guide tab for the full list.
- Precision-engineered replacement: built to match the design, function and performance of the original master cylinder, with a housing constructed to match the casting material of the original part for similar performance.
- Aluminum housing, 1 in bore, two outlets: the secondary/rearward outlet uses an M12 x 1.0 thread and the primary outlet has a 1 mm thread pitch.
- Durable rubber: all rubber components use a high-quality EPDM compound for resistance to glycol-based brake fluid.
- 100% new: made entirely of new materials, not remanufactured, and made to meet rigorous SAE International standards.
Ships with the reservoir and fluid-level sensor; mounting hardware is not included. Signs the original may need replacing include a brake pedal that slowly sinks to the floor under steady pressure, a spongy pedal, or fluid leaking at the cylinder — diagnose the cause first, and if a failed master cylinder is the cause, this unit replaces it. Country of origin: China.
Interchange: 174-746 · 174746 · 174-772 · 174772 · 18M734 · 83-36099 · 8336099 · M900955 · 100-4264 · 1004264 · M-82099 · M82099 · 13050 · 13-2714 · 132714 · 10-2714 · 102714 · 130.62099 · 131.62099 · MC250960 · 355-45011 · 35545011 · 18020057 · 18021862 · 18029759 · 18029856 · 18029946 · 18029972 · 18044394 · 18046507 · NM2714 · MC390267 · F131419 · MC131419. Manufacturer part number M390267.
This part cross-references / interchanges with the following part numbers:
174-746, 174-772, 18M734, 83-36099, M900955, 100-4264, M-82099, 13050, 13-2714, 10-2714, 130.62099, 131.62099, MC250960, 355-45011, 18020057, 18021862, 18029759, 18029856, 18029946, 18029972, 18044394, 18046507, NM2714, MC390267, F131419, MC131419
Frequently Asked Questions
What does the Dorman M390267 master cylinder do?
It converts the force applied at the brake pedal into hydraulic pressure that is sent to the vehicle's brake circuits to apply the brakes.
Does it include a reservoir and sensor?
Yes — the reservoir and fluid-level sensor are included. Mounting hardware is not included; consult the vehicle service information for the correct fasteners and whether they may be reused.
What is the bore size and material?
The housing is aluminum with a 1 in bore. It has two outlets — the secondary/rearward outlet is M12 x 1.0 and the primary outlet has a 1 mm thread pitch.
What vehicles does it fit?
It fits select 1995-2004 Cadillac, Buick, Oldsmobile and Pontiac models including the DeVille, Seville, Eldorado, LeSabre, Park Avenue, 88 and Bonneville. See the Buyer's Guide tab for exact years per model.
How do I know if my master cylinder needs replacing?
Signs include a pedal that slowly sinks under steady pressure, a spongy pedal, or fluid leaking at the cylinder. Diagnose the cause first; if the master cylinder is at fault, this replaces it.
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Dorman - First Stop Brake Master Cylinder P/N:M390267
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