Convert pedal effort into hydraulic pressure for the brakes with this Dorman 1971-1972 Ford Mustang master cylinder, part number M71248. It is a new unit, precision-engineered to match the original master cylinder's design, function, and performance. It installs as a direct-fit replacement for the 1971-1972 Ford Mustang with all engines, and the reservoir comes included.
Specifications: 1 in. bore diameter. Two outlets, with a 3/8-24 rearward outlet and a 1/2-20 secondary outlet thread. The reservoir is included; a sensor and mounting hardware are not. Country of origin: China.
A master cylinder may need replacing if the brake pedal slowly sinks under steady pressure, feels spongy, or if fluid is seeping at the cylinder. Other brake components can cause similar symptoms, so diagnose the system before replacing parts. Consult the vehicle service information for bench-bleeding and brake-bleeding procedures. It also covers the correct mounting fasteners and whether they may be reused.
Interchange: 783-34011 · 83-34011 · M-81011 · 13-1378 · 10-1378 · 10-1378B · 130.61011 · 131.61011 · 355-54014
M900103 · 11378 · MC250070 · C7ZZ2140F · C8ZZ2140A · D2ZZ2140A · 2620837 · 5472974 · 71248 · M1378 · M1488 · NM1378 · NM1488 · MC36251 · F64828 · F71248 · MC64828 · MC71248 · 78334011 · 8334011 · M81011 · 131378 · 101378 · 101378B · 13061011 · 13161011 · 35554014
This part cross-references / interchanges with the following part numbers:
Which vehicles does this 1971-1972 Ford Mustang master cylinder fit?
Dorman M71248 is listed for the 1971-1972 Ford Mustang with all engines. Check the Buyer's Guide tab to confirm it matches your vehicle.
Is the reservoir included?
Yes, the M71248 comes with the reservoir. No sensor and no mounting hardware are included.
What are the bore and outlet sizes?
It has a 1 in. bore diameter and two outlets. The rearward outlet is 3/8-24 and the secondary outlet thread is 1/2-20.
What is the housing made of?
The cylinder housing is cast iron, built to match the casting material of the original part. Its rubber components use an EPDM compound for resistance to glycol-based brake fluid.
What are signs a master cylinder may need replacing?
Common signs include a brake pedal that slowly sinks under steady pressure, a spongy pedal, or fluid leaking at the cylinder. Other brake parts can cause these symptoms, so diagnose the system first.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
