Dorman M390338 Brake Master Cylinder

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

The Dorman M390338 brake master cylinder is designed specifically for Ford F-250, F-250 HD, and F-350 models. Engineered with precision, this aluminum master cylinder includes a reservoir and sensor to ensure consistent brake performance and safety.

Key Features of the Dorman M390338 Brake Master Cylinder

• Master cylinder bore diameter: 1.25 inches for optimal hydraulic pressure
• Constructed from durable aluminum material for corrosion resistance
• Includes reservoir and sensor for integrated brake fluid monitoring
• Equipped with three outlets to support complex brake hydraulic systems
• Rearward outlet size: 7/16-24 thread for secure brake line connections
• Secondary outlet thread diameters: 9/16-18 and 3/8-24 for versatile fitment
• Package contains the master cylinder unit; mounting hardware not included

Detailed Description of the Dorman M390338 Brake Master Cylinder

This brake master cylinder is crafted from aluminum, providing a lightweight yet robust component for your Ford F-250, F-250 HD, or F-350. The 1.25-inch bore diameter is designed to deliver precise hydraulic pressure to the braking system, ensuring reliable stopping power. The included reservoir allows for proper brake fluid storage, while the integrated sensor monitors fluid levels to alert drivers of potential issues. With three outlets and multiple thread sizes, this master cylinder accommodates the complex brake hydraulics found in heavy-duty Ford trucks. Note that mounting hardware is not included, so ensure compatibility with your vehicle’s existing setup.

Common Applications and Issues Addressed

• Replacement for worn or leaking master cylinders in Ford F-250 and F-350 brake systems
• Restores proper hydraulic pressure for improved brake responsiveness
• Resolves brake fluid leaks caused by damaged reservoirs or seals
• Addresses sensor malfunctions related to brake fluid level monitoring
• Supports brake system upgrades requiring multiple outlet connections

Installation Notes and Tips

• Verify compatibility with Ford F-250, F-250 HD, and F-350 models before installation
• Bleed the brake system thoroughly after installation to remove air pockets
• Use appropriate thread sealant on outlet connections to prevent leaks
• Check sensor wiring and connections for proper operation
• Mounting hardware is not included; reuse existing hardware or source separately

Quality Assurance and Warranty Information

Dorman manufactures the M390338 brake master cylinder to meet or exceed OEM specifications for Ford trucks. The aluminum construction offers corrosion resistance and durability under demanding conditions. This part is backed by Dorman’s standard warranty coverage, providing assurance of quality and performance for your Ford F-250, F-250 HD, and F-350 brake systems.