Dorman M39773 Brake Master Cylinder

Reliable Brake Master Cylinder for Ford and Mercury Vehicles

The Dorman M39773 brake master cylinder is engineered to restore proper brake hydraulics in select Ford and Mercury models. Designed with a cast iron body and integrated reservoir, this master cylinder ensures consistent brake fluid delivery and pressure for safe stopping performance.

• Master cylinder bore diameter: 0.938 inches for precise hydraulic control
• Durable cast iron construction for long-lasting strength
• Includes reservoir and sensor for complete brake system integration
• Four outlets with rearward outlet sizes M10 x 1.0 and M16 x 1.0
• Secondary outlet thread diameters M12 x 1.0 and M18 x 1.5
• Compatible with Ford Cougar, Mercury Sable, Ford Taurus, and Ford Thunderbird

Product Details and Specifications

The Dorman M39773 brake master cylinder features a 0.938-inch bore diameter, which is critical for maintaining proper hydraulic pressure within the brake system. Constructed from cast iron, this master cylinder offers durability and resistance to wear under demanding conditions. It comes complete with an integrated reservoir and sensor, allowing for seamless installation and accurate brake fluid level monitoring. The unit includes four outlets, with rearward outlet sizes of M10 x 1.0 and M16 x 1.0, and secondary outlet thread diameters of M12 x 1.0 and M18 x 1.5, ensuring compatibility with the brake lines on specified Ford and Mercury models.

Compatible Vehicles and Applications

This brake master cylinder is designed specifically for use in the following vehicles:

• Ford Cougar
• Mercury Sable
• Ford Taurus
• Ford Thunderbird

Using the Dorman M39773 ensures proper fitment and function in these models, helping maintain the integrity of the brake hydraulic system.

Common Issues Addressed by This Master Cylinder

• Brake pedal sinking or sponginess due to internal leaks
• Brake fluid leaks from a worn or damaged master cylinder
• Inconsistent brake pressure affecting stopping performance
• Brake warning light activation related to sensor failure
• Reduced braking efficiency caused by reservoir or sensor malfunction

Installation Notes and Tips

• Ensure brake fluid system is properly bled after installation to remove air
• Verify outlet thread sizes match vehicle brake line fittings before installation
• Check sensor connections for secure fit to maintain brake warning system functionality
• Use appropriate tools to avoid damage to cast iron housing during installation
• Consult vehicle service manual for torque specifications and installation procedures

Quality Assurance and Warranty

Dorman manufactures the M39773 brake master cylinder to meet or exceed OEM standards for fit, form, and function. The cast iron construction and integrated components are tested for durability and performance. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in materials and workmanship to provide confidence in the product's reliability.