Dorman M105808 Brake Master Cylinder

Reliable Brake Master Cylinder for Ford and Mercury Vehicles

The Dorman M105808 brake master cylinder is designed to restore proper brake hydraulics in select Ford and Mercury models. Engineered with a cast iron body and a 21mm bore diameter, this master cylinder ensures consistent brake fluid pressure for safe stopping performance.

• Compatible with Ford Capri, Cougar, Fairmont, LTD, Marquis, Mustang, Thunderbird, and Mercury Zephyr
• Cast iron construction for durability and strength
• Includes reservoir for brake fluid storage
• Two outlet ports with rearward outlet size of 9/16-18 and secondary outlet thread diameter of 0.5 inches
• Does not include mounting hardware or sensor

Product Details and Specifications

The Dorman M105808 brake master cylinder features a 21mm bore diameter, which is critical for maintaining the correct hydraulic pressure in the brake system. Its cast iron material provides long-lasting resistance to wear and corrosion. This unit comes with an integrated reservoir, eliminating the need for a separate fluid container. The master cylinder has two outlets, including a rearward outlet sized at 9/16-18 and a secondary outlet with a 0.5-inch thread diameter, allowing for proper brake line connections. Note that mounting hardware and sensors are not included with this part.

Compatible Vehicles and Applications

This brake master cylinder is compatible with a range of Ford and Mercury vehicles, including the Ford Capri, Cougar, Fairmont, LTD, Marquis, Mustang, Thunderbird, and the Mercury Zephyr. It is designed to meet the hydraulic requirements of these models, making it a suitable replacement part for brake system repairs or upgrades.

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
• Reduced braking efficiency caused by improper hydraulic pressure
• Brake warning light activation related to master cylinder failure
• Inconsistent brake pedal feel or travel distance

Installation Notes and Tips

When installing the Dorman M105808 master cylinder, ensure the brake system is properly bled to remove any air pockets. Since mounting hardware is not included, reuse existing hardware or acquire compatible fasteners. Verify that the reservoir is filled with the correct brake fluid type recommended for your vehicle. Inspect brake lines and fittings for wear or damage during installation to maintain system integrity.

Quality Assurance and Warranty Information

Dorman manufactures this brake master cylinder to meet or exceed OEM specifications for fit and function. The cast iron construction and precise bore diameter contribute to reliable brake system performance. While specific warranty details are not provided here, Dorman typically offers limited warranties on their replacement parts to ensure customer confidence.