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Dorman - First Stop Brake Master Cylinder P/N:M39531
$65.99
Convert brake-pedal force into the hydraulic pressure that operates the brakes with the Dorman First Stop Brake Master Cylinder M39531. It installs as a direct-fit replacement for the 1984-1986 Ford LTD, Mustang, and Thunderbird, plus the 1984-1986 Mercury Capri, Cougar, and Marquis and the 1984 Mercury Grand Marquis [All engines] — Dorman precision-engineers it to match the design, function, and performance of the original unit on these applications.
- Cast-iron housing: built to match the casting material of the original part for similar performance.
- Hydraulic specs: 21 mm bore with two outlets and a 1/2-20 rearward outlet size.
- Durable seals: 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.
The reservoir is included. Mounting hardware and a sensor are not included; consult the vehicle service information for the correct fasteners and whether they may be reused. Country of origin: China.
Interchange: 18M287 · M900493 · 12162 · 13-1907 · 131907 · 10-1907 · 101907 · 130.61043 · MC112311 · 355-54035 · 35554035 · E4DZ2140A · 112311 · 2539531 · MC39531 · F112311. Manufacturer part number M39531.
This part cross-references / interchanges with the following part numbers:
18M287, M900493, 12162, 13-1907, 10-1907, 130.61043, MC112311, 355-54035, E4DZ2140A, 112311, 2539531, MC39531, F112311
Frequently Asked Questions
What vehicles does this master cylinder fit?
It's a direct-fit replacement for the 1984-1986 Ford LTD, Mustang, and Thunderbird, the 1984-1986 Mercury Capri, Cougar, and Marquis, and the 1984 Mercury Grand Marquis. See the Buyer's Guide tab for the full list.
Is the reservoir included?
Yes, the reservoir is included. A sensor and mounting hardware are not included with this master cylinder.
What are the bore and outlet specs?
It has a 21 mm bore diameter with two outlets, and the rearward outlet size is 1/2-20.
Is this a remanufactured unit?
No. It is 100% new, made entirely of new materials rather than remanufactured, and made to meet SAE International standards.
What are signs the master cylinder may need replacing?
Common signs include a brake pedal that slowly sinks to the floor, a spongy pedal, or fluid loss with no visible external leak. Have the cause diagnosed before replacing.
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Dorman - First Stop Brake Master Cylinder P/N:M39531
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