Dorman M39173 Brake Master Cylinder

Reliable Brake Master Cylinder for Ford F-250 and F-350

The Dorman M39173 brake master cylinder is engineered to restore proper brake hydraulics in Ford F-250 and F-350 trucks. Designed with durable cast iron and a precise 1.063-inch bore diameter, this master cylinder ensures consistent brake fluid pressure for safe stopping performance.

• Compatible with Ford F-250 and F-350 models
• Master cylinder bore diameter: 1.063 inches
• Constructed from durable cast iron material
• Includes reservoir for brake fluid
• Two outlet ports with rearward outlet size 3/8-24 inches and secondary outlet thread diameter 7/16-24
• Package contains master cylinder only; mounting hardware not included

Durable Construction and Precise Specifications

The Dorman M39173 brake master cylinder features a cast iron body that provides strength and resistance to wear under demanding conditions. Its 1.063-inch bore diameter is designed to match the hydraulic requirements of Ford F-250 and F-350 brake systems. The included reservoir allows for proper brake fluid storage and circulation, while the two outlet ports with specific thread sizes ensure compatibility with factory brake lines. This master cylinder does not include mounting hardware or sensors, so those components must be sourced separately if needed.

Applications and Problem Resolution

This brake master cylinder is intended for use in restoring brake hydraulic function on Ford F-250 and F-350 trucks. It addresses common brake system issues such as:

• Brake pedal sinking or sponginess due to internal cylinder wear
• Brake fluid leaks from a failing master cylinder
• Inconsistent brake pressure affecting stopping performance
• Brake warning light activation related to master cylinder failure
• Replacement during brake system overhaul or maintenance

Installation Notes and Tips

When installing the Dorman M39173 master cylinder, ensure the brake system is properly bled to remove air and maintain hydraulic integrity. Since mounting hardware is not included, verify compatibility with existing brackets and fasteners. Inspect brake lines and fittings for wear or damage before reassembly. Follow manufacturer torque specifications for outlet fittings to prevent leaks.

Quality Assurance and Warranty

Dorman manufactures the M39173 brake master cylinder to meet or exceed OEM standards for fit, form, and function. The cast iron construction and precise machining contribute to reliable brake system performance. While specific warranty details should be confirmed at the time of purchase, Dorman typically offers limited warranties covering defects in materials and workmanship.