Dorman M390269 Brake Master Cylinder

Reliable Brake Master Cylinder for Ford, Mazda, and Mercury Vehicles

The Dorman M390269 brake master cylinder is engineered to restore proper brake hydraulics in select Ford, Mazda, and Mercury models. Designed with precision, this aluminum master cylinder includes a reservoir and sensor to ensure consistent brake performance and safety.

• Master cylinder bore diameter: 1.063 inches for accurate hydraulic pressure
• Durable aluminum construction for corrosion resistance and longevity
• Includes reservoir and sensor for integrated brake fluid monitoring
• Two outlet ports with rearward outlet size M10 x 1.0 and secondary outlet thread diameter M12 x 1.0
• Compatible with Ford B2300, B3000, B4000, Explorer, Ranger, and Mercury Mountaineer

Product Features and Specifications

The Dorman M390269 brake master cylinder is crafted from aluminum, providing a lightweight yet robust component that resists corrosion and wear. Its 1.063-inch bore diameter is designed to deliver precise hydraulic pressure to the brake system. This master cylinder comes complete with a reservoir and sensor, allowing for seamless integration with the vehicle’s brake fluid monitoring system. Featuring two outlets, it supports efficient brake fluid distribution with rearward and secondary outlet thread sizes of M10 x 1.0 and M12 x 1.0 respectively. Note that mounting hardware is not included with this part.

Compatible Vehicles and Applications

This brake master cylinder is compatible with a range of Ford, Mazda, and Mercury models, including the Ford B2300, B3000, B4000, Explorer, Ranger, and the Mercury Mountaineer. The part number M390269 ensures you receive the correct replacement component designed specifically for these vehicles’ brake hydraulic systems.

Common Issues Addressed by This Brake 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 seal failure

Installation Notes and Tips

When installing the Dorman M390269 brake master cylinder, ensure the brake fluid reservoir is properly filled and free of contaminants. Bleed the brake system thoroughly to remove air pockets and verify that the sensor connections are secure. Since mounting hardware is not included, retain or replace existing hardware as needed. Proper installation is critical to maintain brake system integrity and safety.

Quality Assurance and Warranty Information

Dorman manufactures this brake master cylinder to meet or exceed OEM standards for fit, form, and function. The aluminum construction and integrated sensor contribute to reliable brake system performance. Please refer to Dorman’s warranty policy for specific coverage details related to the M390269 part number.