Dorman M390337 Brake Master Cylinder

Reliable Brake Master Cylinder for Ford and Lincoln Vehicles

The Dorman M390337 Brake Master Cylinder is engineered to restore proper brake hydraulics in select Ford and Lincoln models. Designed with precision, this master cylinder includes a reservoir and sensor to ensure optimal brake system performance.

• Master cylinder bore diameter: 1.25 inches for consistent hydraulic pressure
• Constructed from durable aluminum material for corrosion resistance
• Includes reservoir and sensor for integrated brake fluid management
• Features three outlets with rearward outlet size M18 x 1.5
• Secondary outlet thread diameters: 9/16-18 and 3/8-24 for versatile brake line connections
• Compatible with Ford Blackwood, Expedition, F-150, F-250, F-250 HD, F-350, and Lincoln Navigator

Detailed Product Description

The Dorman M390337 brake master cylinder is designed to meet the specific hydraulic requirements of various Ford and Lincoln trucks and SUVs. Its 1.25-inch bore diameter ensures consistent brake fluid pressure, which is critical for safe and responsive braking. The aluminum construction offers durability and resistance to corrosion, extending the service life of the component. This master cylinder comes complete with an integrated reservoir and sensor, allowing for accurate fluid level monitoring and seamless integration with the vehicle's brake system. The three outlet ports, including a rearward outlet sized M18 x 1.5 and secondary outlets with thread diameters of 9/16-18 and 3/8-24, provide compatibility with multiple brake line configurations found in the specified vehicle models.

Common Applications and Problem Resolution

• Restores brake fluid pressure in Ford F-150 and F-250 brake systems
• Replaces faulty or leaking master cylinders in Lincoln Navigator and Ford Expedition
• Addresses brake pedal sponginess or sinking issues
• Eliminates brake fluid leaks from the master cylinder reservoir or outlets
• Resolves sensor-related brake warning light activation

Installation Notes and Tips

Installation of the Dorman M390337 brake master cylinder requires proper brake system bleeding to remove air and ensure optimal performance. Since mounting hardware is not included, retain original fasteners or source compatible hardware. Verify thread sizes on brake lines before installation to ensure proper fit with the M18 x 1.5 rearward outlet and secondary outlet threads. It is recommended to inspect related brake components during installation for wear or damage.

Quality Assurance and Warranty

Dorman manufactures this brake master cylinder to meet or exceed OEM specifications for the listed Ford and Lincoln models. The aluminum construction and integrated sensor contribute to reliable operation under normal driving conditions. Please refer to Dorman's warranty policy for coverage details on the M390337 part number.