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Dorman M39401 Brake Master Cylinder
| Brand | Dorman M39401 |
|---|---|
| Mounting Hardware Included | No |
| Master Cylinder Bore Diameter | 0.938 |
| Master Cylinder Material | Cast iron |
| Reservoir Included | Yes |
| Sensor Included | No |
| Number of Outlets | 2 |
| Package Contents | Master cylinder |
| Rearward Outlet Size | 1/2-20 |
| Secondary Outlet Thread Diameter | 3/8-24 in |
| Fits | Ford · 5 vehicles |
Direct replacement. Matches the original master cylinder design and function for listed applications.
Cast iron body. Provides a durable housing for brake hydraulic service.
Reservoir included. Supplied as a complete master cylinder assembly.
Cross-references Cardone New 13-1931, Centric Parts 130.65029 and Raybestos Brakes MC39401 for the same application. See all 13.
Brake Master Cylinder Overview
This Dorman brake master cylinder is built for specific Ford applications and matches the original design, function, and performance requirements. It uses new materials and a cast iron body for a direct replacement in brake hydraulic service.
Part number M39401 is a practical choice when the original master cylinder shows internal wear, leakage, or inconsistent pedal response. The included reservoir and two-outlet layout support the hydraulic setup used on the listed applications.
Key Features
- Cast iron master cylinder body for brake hydraulic durability
- 0.938 bore diameter for the specified brake system setup
- Reservoir included for a complete master cylinder assembly
- Two outlet ports with 1/2-20 rearward outlet and 3/8-24 secondary outlet thread
- New-material construction for replacement use
Detailed Description
Dorman M39401 is a brake master cylinder engineered to match the original unit used on select Ford Bronco II and Ford Ranger models. It is designed around the listed bore size and outlet configuration, making it a fitment-specific replacement for brake hydraulic repair. The cast iron construction and reservoir-included design support dependable service in the master cylinder assembly.
This part cross-references Raybestos Brakes (e.g., MC39401) for the same application. For buyers searching for a Ford Ranger brake master cylinder or a Ford Bronco II master cylinder replacement, M39401 provides the correct hydraulic layout for the listed manual-brake and drum-brake applications.
What It Helps Fix
- Brake fluid leakage from a worn master cylinder
- Soft or inconsistent brake pedal feel
- Loss of hydraulic pressure in the brake system
- Internal seal wear affecting braking response
- Replacement needs on manual-brake or drum-brake applications
Installation Notes and Tips
Verify bore diameter, outlet thread sizes, and reservoir configuration before installation. This master cylinder does not include mounting hardware, and the sensor is not included. Bleed the brake system after installation to remove trapped air and restore proper pedal feel.
Quality Assurance
Dorman manufactures this master cylinder as a direct replacement for the original design on the listed applications. Part number M39401 is built with new materials to meet the functional requirements of the brake hydraulic system.
| Year | Make | Model | Notes |
|---|---|---|---|
| 1985 | Ford | Bronco II | Bore: 15/16 In.; w/Manual Brakes |
| 1985 | Ford | Ranger | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1984 | Ford | Bronco II | Bore: 15/16 In.; w/Manual Brakes |
| 1984 | Ford | Ranger | Fits 15/16" bore size drum brakes on multiple vehicle models. |
| 1983 | Ford | Ranger | Fits 15/16" bore size drum brakes on multiple vehicle models. |
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