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Dorman - First Stop Brake Master Cylinder P/N:M39637
$81.99
Convert brake-pedal force into the hydraulic pressure your braking system depends on with the Dorman - First Stop Brake Master Cylinder M39637. It drops in as a direct-fit replacement for the 1987-1993 Ford Mustang, 1987-1988 Ford Thunderbird, and 1987-1988 Mercury Cougar (All engines), and is engineered to reproduce the design, function, and performance of the original master cylinder on those 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: a high-quality EPDM compound resists glycol-based brake fluid.
- Three outlets: rearward outlet M10 x 1.0, secondary outlet thread M12 x 1.0, primary outlet thread pitch 1 mm.
Made to meet SAE International standards. The reservoir and sensor are included; mounting hardware is not included — consult the vehicle service information for the correct fasteners and whether they may be reused. Signs the original master cylinder may need replacing include a brake pedal that slowly sinks under steady foot pressure, a spongy pedal, or fluid seepage around the unit; diagnose the cause before replacing. Country of origin: China.
Interchange: 18M355 · 783-34001 · 78334001 · 83-34001 · 8334001 · M900561 · 100-2067 · 1002067 · M-81001 · M81001 · 12196 · 13-4005 · 134005 · 10-4005 · 104005 · 130.61001 · 13061001 · 131.61001 · 13161001 · MC117583 · 355-54007 · 35554007 · E7SZ2140A · E9ZZ2140A · F0ZZ2140A · 117583 · M2196 · NM2196 · MC39637 · F117583. Manufacturer part number M39637.
This part cross-references / interchanges with the following part numbers:
18M355, 783-34001, 83-34001, M900561, 100-2067, M-81001, 12196, 13-4005, 10-4005, 130.61001, 131.61001, MC117583, 355-54007, E7SZ2140A, E9ZZ2140A, F0ZZ2140A, 117583, M2196, NM2196, MC39637, F117583
Frequently Asked Questions
What does this master cylinder do?
It converts the force from your brake pedal into hydraulic pressure that is distributed to the brake system through its three outlets.
Does it include a reservoir and sensor?
Yes. Both the reservoir and the sensor are included. Mounting hardware is not included, so consult the vehicle service information for the correct fasteners.
What vehicles does the M39637 fit?
It is a direct-fit replacement for the 1987-1993 Ford Mustang and the 1987-1988 Ford Thunderbird and Mercury Cougar (all engines). Check the Buyer's Guide tab to confirm.
Is it remanufactured?
No. It is 100% new, built entirely from new materials, with EPDM rubber components made to resist glycol-based brake fluid.
What are signs my master cylinder may need replacing?
A pedal that slowly sinks under steady pressure, a spongy pedal, or fluid seepage around the unit. Diagnose the cause first, as other parts can produce these symptoms.
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Dorman - First Stop Brake Master Cylinder P/N:M39637
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