Turn pedal force into hydraulic braking pressure with the Dorman First Stop Brake Master Cylinder M39173, a new 1980-1983 Ford F-250 master cylinder that is also listed for the 1980-1983 Ford F-350. It is a direct-fit replacement for the 1980-1983 Ford F-250 and 1980-1983 Ford F-350 with all engines.
Dorman precision-engineers this master cylinder to match the design, function and performance of the original unit. It is built from new, high-quality materials and intended as a durable replacement.
- Precise replacement: the cast iron cylinder housing is built to match the casting material of the original part for similar performance.
- Durable design: every rubber component uses a high-quality EPDM compound for resistance to glycol-based brake fluid.
- 100% new: made entirely of new materials.
- Strict specifications: made to meet rigorous SAE International standards.
Specifications: 1.063 in bore diameter · 2 outlets · 3/8-24 in rearward outlet · 7/16-24 secondary outlet thread · reservoir included · no sensor included · mounting hardware not included. Country of origin: China.
Signs a master cylinder may need replacing include a soft or sinking brake pedal, brake fluid leaking at the cylinder, or a fluid level that keeps dropping. Diagnose the brake system before replacing parts, bleed the system as the service procedure directs, and consult the vehicle service information for the correct fasteners and whether the originals may be reused.
Interchange: 783-42047 · 83-42047 · 100-2498 · M-85047 · 13-1856 · 10-1856 · 130.65047 · 131.65047 · 355-54166
78342047 · 8342047 · 1002498 · M85047 · 131856 · 101856 · 13065047 · 13165047 · 35554166 · 18M115 · M900307 · 11856 · MC102421 · E0TZ2140B · 102421 · M1856 · NM1856 · MC39173 · F102421
This part cross-references / interchanges with the following part numbers:
18M115, 783-42047, 83-42047, M900307, 100-2498, M-85047, 11856, 13-1856, 10-1856, 130.65047, 131.65047, MC102421, 355-54166, E0TZ2140B, 102421, M1856, NM1856, MC39173, F102421
