Dorman M390740 Brake Master Cylinder

Reliable Brake Master Cylinder for Ford and Lincoln Vehicles

The Dorman M390740 Brake Master Cylinder is engineered to restore proper brake hydraulics in select Ford and Lincoln models. Designed with precision, this master cylinder ensures consistent brake fluid pressure for safe and effective braking performance.

• Master cylinder bore diameter of 1.25 inches for accurate hydraulic control
• Constructed from durable aluminum material for corrosion resistance
• Includes reservoir and sensor for integrated brake fluid management
• Features three outlets with specific thread sizes: rearward outlet 7/16-24, secondary outlets 9/16-18 and 3/8-24
• Compatible with Ford Blackwood, Expedition, F-150, and Lincoln Navigator models

Product Details and Specifications

The Dorman M390740 master cylinder is crafted from aluminum, providing a lightweight yet sturdy component that resists corrosion and wear. Its 1.25-inch bore diameter is designed to deliver precise hydraulic pressure, essential for maintaining brake system integrity. This unit includes a reservoir and sensor, allowing for seamless integration with the vehicle’s brake fluid monitoring system. The master cylinder features three outlets with specific thread sizes—7/16-24 for the rearward outlet and 9/16-18 & 3/8-24 for secondary outlets—ensuring compatibility with the brake lines of Ford Blackwood, Expedition, F-150, and Lincoln Navigator models. Note that mounting hardware is not included with this part.

Applications and Common Issues Addressed

• Restores brake fluid pressure in vehicles experiencing spongy or unresponsive brakes
• Replaces master cylinders with leaks or internal seal failures
• Resolves brake warning light activation due to sensor or reservoir issues
• Addresses brake pedal sinking or inconsistent brake pedal feel
• Improves overall brake system reliability in Ford and Lincoln trucks and SUVs

Installation Notes and Tips

• Ensure compatibility with your specific Ford or Lincoln model before installation
• Bleed the brake system thoroughly after installation to remove air pockets
• Use appropriate brake fluid as specified by the vehicle manufacturer
• Check all outlet connections for proper thread engagement and sealing
• Mounting hardware must be sourced separately as it is not included

Quality Assurance and Warranty Information

Dorman manufactures the M390740 master cylinder to meet or exceed OEM standards for fit, form, and function. The aluminum construction and integrated sensor contribute to long-term durability and reliable brake system performance. This part is backed by Dorman’s limited warranty, providing coverage against defects in material and workmanship under normal use conditions.