Send steady hydraulic pressure to your brakes with the Dorman First Stop Brake Master Cylinder M39445. This new unit converts brake-pedal force into the pressure that applies the brakes. It fits many vehicles, among them the 1984-1986 Ford F-250, 1984-1986 Ford E-250 Econoline and 1984-1986 Ford E-250 Econoline Club Wagon. See the Buyer's Guide tab for the full list.
Dorman engineered this master cylinder to match the original unit's design, function and performance on the listed applications. It is built from new, high-quality materials for a safe and durable replacement.
Specifications: 1.125 in bore diameter, two outlets, a 3/8-24 in rearward outlet size and a 7/16-24 secondary outlet thread. The reservoir is included. A sensor and mounting hardware are not included. Country of origin: China.
Signs a master cylinder may need replacing include a soft or sinking brake pedal, brake fluid leaking around the cylinder, or a fluid level that keeps dropping. Other brake components can cause the same symptoms, so diagnose the cause before replacing the master cylinder.
Interchange: 783-42031 · 83-42031 · 100-2472 · M-85031 · 13-2008 · 10-2008 · 130.65031 · 131.65031 · 355-54151
78342031 · 8342031 · 1002472 · M85031 · 132008 · 102008 · 13065031 · 13165031 · 35554151 · 18M236 · M900436 · 12008 · MC110919 · E4TZ2140B · 110919 · M2008 · NM2008 · MC39445 · F110919
This part cross-references / interchanges with the following part numbers:
Is this the right Ford F-250 master cylinder for a 1984-1986 Ford F-250?
It is listed for the 1984-1986 Ford F-250 with all engines. Check the Buyer's Guide tab to confirm your exact vehicle.
Does it also fit the 1984-1986 Ford E-250 Econoline van?
Yes. It is listed for the 1984-1986 Ford E-250 Econoline and the 1984-1986 Ford E-250 Econoline Club Wagon. The Buyer's Guide tab shows every listed application.
What comes in the box?
You get the master cylinder with its reservoir. A sensor and mounting hardware are not included, so consult the vehicle service information for the correct fasteners and whether the originals may be reused.
What are the key specifications?
It has a 1.125 in bore, two outlets, a 3/8-24 in rearward outlet and a 7/16-24 secondary outlet thread. The housing is cast iron and the rubber components are EPDM.
How is it installed?
A master cylinder is typically bench-bled before installation, and the brake system is bled afterward. Follow the vehicle service information for the full procedure.
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.
