Dorman M390463 Brake Master Cylinder

Reliable Brake Master Cylinder for Ford and Mercury Vehicles

The Dorman M390463 brake master cylinder is engineered to restore proper brake hydraulics in select Ford and Mercury models. Designed with precision, this aluminum master cylinder ensures consistent brake fluid pressure for safe and effective braking performance.

• Master cylinder bore diameter: 1 inch
• Constructed from durable aluminum material
• Includes 4 outlets for brake line connections
• Rearward outlet size: M10 x 1.0 thread
• Secondary outlet thread diameter: M12 x 1.0 with 1.0 thread pitch
• Package contains the master cylinder only; mounting hardware and reservoir are not included

Product Details and Specifications

The Dorman M390463 brake master cylinder is designed specifically for Ford Contour, Mercury Cougar, and Mercury Mystique models. Its 1-inch bore diameter provides the necessary hydraulic pressure for effective brake system operation. Manufactured from aluminum, this master cylinder offers corrosion resistance and durability under typical driving conditions. The unit features four outlets, including a rearward outlet with M10 x 1.0 threading and a secondary outlet with M12 x 1.0 threading, both with a 1.0 thread pitch, ensuring compatibility with the brake lines on the specified vehicles. Note that this product does not include a reservoir or sensor, and mounting hardware is not provided.

Common Applications and Problem Resolution

• Restores brake fluid pressure in Ford Contour and Mercury Cougar brake systems
• Replaces worn or leaking master cylinders causing brake pedal issues
• Addresses brake fluid leaks due to damaged or corroded master cylinder components
• Improves brake system responsiveness and safety
• Solves inconsistent brake pedal feel or sinking pedal problems

Installation Notes and Tips

Installation of the Dorman M390463 master cylinder requires proper brake system knowledge and tools. Since mounting hardware and reservoir are not included, reuse existing components or source replacements as needed. Ensure all brake lines are properly connected to the four outlets, matching the specified thread sizes (M10 x 1.0 and M12 x 1.0). Bleed the brake system thoroughly after installation to remove air and restore optimal brake function. Consult vehicle-specific service manuals for torque specifications and detailed procedures.

Quality Assurance and Warranty Information

Dorman manufactures the M390463 brake master cylinder to meet or exceed OEM standards for fit, form, and function. The aluminum construction provides durability and resistance to corrosion. While specific warranty details are not provided here, Dorman typically offers limited warranties on their brake hydraulic components. Verify warranty coverage with the product documentation or supplier at the time of purchase.