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Dorman - First Stop Brake Master Cylinder P/N:M39981
$89.99
Turn brake-pedal effort into the hydraulic pressure your brakes rely on with the Dorman - First Stop Brake Master Cylinder M39981. It converts the force from the brake pedal into the hydraulic pressure sent to the brake system, and it drops in as a direct-fit replacement for the 1990-1994 Jeep Cherokee, 1990-1992 Jeep Comanche, and 1990 Jeep Wagoneer (All engines). Dorman precision-engineers this unit to the design, function, and performance of the original master cylinder for the listed applications.
- Cast iron housing: constructed to match the casting material of the original part for similar performance.
- Durable EPDM seals: 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 built to meet rigorous SAE International standards.
- Specs: two outlets, 0.938 in bore diameter, 7/16-24 rearward outlet and 1/2-20 secondary outlet thread. Reservoir included; sensor not included.
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: 18M532 · 83-40011 · 8340011 · M900739 · 100-2667 · 1002667 · M-87011 · M87011 · 12324 · 13-2556 · 132556 · 10-2556 · 102556 · 130.67011 · 131.67011 · 5252622 · 5252623 · MC128339 · 355-42025 · 35542025 · M2556 · NM2556 · MC39981 · F128339. Manufacturer part number M39981.
This part cross-references / interchanges with the following part numbers:
18M532, 83-40011, M900739, 100-2667, M-87011, 12324, 13-2556, 10-2556, 130.67011, 131.67011, 5252622, 5252623, MC128339, 355-42025, M2556, NM2556, MC39981, F128339
Frequently Asked Questions
Which vehicles does the M39981 master cylinder fit?
It's a direct-fit replacement for the 1990-1994 Jeep Cherokee, 1990-1992 Jeep Comanche, and 1990 Jeep Wagoneer (All engines). Check the Buyer's Guide tab to confirm your vehicle.
Does it come with a reservoir?
Yes, the reservoir is included. A sensor and mounting hardware are not included with this master cylinder.
What is this master cylinder made of?
The cylinder housing is cast iron, constructed to match the original part's casting material, and the rubber components use an EPDM compound for resistance to glycol-based brake fluid.
Is this a remanufactured unit?
No. It's 100% new, made entirely of new materials rather than remanufactured, and built to meet rigorous SAE International standards.
What does a brake master cylinder do, and what are signs it may need replacing?
It converts brake-pedal force into hydraulic pressure for the brakes. A sinking or soft pedal or fluid leaks may signal it needs replacing; diagnose the cause before replacing.
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Dorman
Dorman - First Stop Brake Master Cylinder P/N:M39981
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