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Dorman - First Stop Brake Master Cylinder P/N:M80903
$55.99
Build the hydraulic pressure that moves your brake fluid to the wheels with the Dorman - First Stop Brake Master Cylinder M80903. When you push the pedal, this master cylinder converts that force into the fluid pressure the brake system needs. It's designed to match the design, function, and performance of the original master cylinder on the listed 1973-1979 Ford, Lincoln, and Mercury full-size and mid-size cars, so it drops in as a direct-fit replacement.
100% new: made entirely of new materials, not remanufactured.
Cast-iron housing: the cylinder housing is built to match the casting material of the original part for similar performance.
EPDM rubber: all rubber components use a high-quality EPDM compound for resistance to glycol-based brake fluid.
SAE standards: made to meet rigorous SAE International standards.
Specs: 1-inch bore, 2 outlets, and a 1/2-20 secondary outlet thread. The reservoir is included; a sensor is not, and mounting hardware is not included — consult the vehicle service information for the correct fasteners and whether they may be reused. Package contents: master cylinder. Country of origin: China.
Fits: 1973-1974 Ford Country Sedan, Country Squire, Galaxie 500, Lincoln Continental, Mercury Colony Park, Monterey; 1973-1977 Ford Custom 500; 1973-1978 Ford LTD, Mercury Marquis; 1973-1979 Ford Thunderbird; 1973-1976 Mercury Montego; 1974-1979 Mercury Cougar; 1975-1976 Ford Elite, Gran Torino, Torino; 1975-1979 Ford Ranchero; 1975-1978 Mercury Grand Marquis; 1977-1979 Ford LTD II [engine: All]. See the Buyer's Guide tab for the full list.
Interchange: 18M30 · 783-34015 · 78334015 · 83-34015 · 8334015 · M900160 · 100-2084 · 1002084 · M81015 · 11525 · 13-1525 · 131525 · 10-1525 · 101525 · 130.61015 · 131.61015 · MC80903 · 355-56002 · 35556002 · D30Z2140A · D3AZ2140A · D60Z2140A · D6AZ2140A · 2622523 · 80903 · M1525 · M1603 · NM1525 · NM1603 · 2536397 · MC36397 · F80903. Manufacturer part number M80903.
This part cross-references / interchanges with the following part numbers:
18M30, 783-34015, 83-34015, M900160, 100-2084, M81015, 11525, 13-1525, 10-1525, 130.61015, 131.61015, MC80903, 355-56002, D30Z2140A, D3AZ2140A, D60Z2140A, D6AZ2140A, 2622523, 80903, M1525, M1603, NM1525, NM1603, 2536397, MC36397, F80903
Frequently Asked Questions
What does this brake master cylinder do?
When you press the pedal, it converts that force into hydraulic pressure that moves brake fluid to the wheel brakes. It's the heart of the hydraulic brake system.
Does it include a reservoir?
Yes, the reservoir is included. A sensor is not included, and mounting hardware is not included.
What are the bore and outlet specs?
It has a 1-inch bore, 2 outlets, and a 1/2-20 secondary outlet thread. The housing is cast iron and the part is 100% new, not remanufactured.
What are the signs this master cylinder may need replacing?
A pedal that slowly sinks to the floor, a spongy or soft pedal, or unexplained brake fluid loss may indicate a failing master cylinder. Diagnose the cause before replacing.
Are the mounting fasteners included?
No, mounting hardware is not included. Consult the vehicle service information for the correct fasteners and whether they may be reused.
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Dorman - First Stop Brake Master Cylinder P/N:M80903
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