Dorman M390389 Brake Master Cylinder

Reliable Brake Master Cylinder for Ford E-250 and E-350 Econoline

The Dorman M390389 brake master cylinder is engineered to restore proper brake hydraulics in Ford E-250 Econoline, E-350 Econoline, and E-350 Econoline Club Wagon models. Designed with precision, this master cylinder ensures consistent brake fluid pressure for safe and effective braking performance.

• Master cylinder bore diameter: 1.25 inches for accurate hydraulic control
• Constructed from durable aluminum material for corrosion resistance
• Includes reservoir and sensor for complete brake system integration
• Equipped with two outlets: rearward outlet size M18 x 1.5 and secondary outlet thread diameter 9/16-24
• Package contains the master cylinder only; mounting hardware not included

Product Details and Specifications

The Dorman M390389 brake master cylinder features a 1.25-inch bore diameter, which is critical for maintaining the correct hydraulic pressure in the brake system of Ford E-250 Econoline, E-350 Econoline, and E-350 Econoline Club Wagon vehicles. Its aluminum construction offers enhanced durability and resistance to corrosion, extending the service life of the component. This master cylinder comes with an integrated reservoir and sensor, allowing for seamless monitoring and fluid management within the brake hydraulics system. The unit includes two outlets: a rearward outlet sized M18 x 1.5 and a secondary outlet with a 9/16-24 thread diameter, ensuring compatibility with the vehicle’s brake lines.

Common Applications and Problem Resolution

• Restores brake fluid pressure in Ford E-250 and E-350 Econoline brake systems
• Addresses brake pedal sinking or sponginess due to master cylinder wear
• Eliminates brake fluid leaks from a failing master cylinder reservoir or seals
• Resolves brake warning light activation caused by sensor malfunction
• Improves overall brake responsiveness and safety

Installation Notes and Tips

Installation of the Dorman M390389 brake master cylinder requires careful attention to brake fluid handling and bleeding procedures to avoid air in the brake lines. Since mounting hardware is not included, ensure existing hardware is in good condition or obtain replacements as needed. Verify compatibility with Ford E-250 Econoline, E-350 Econoline, and E-350 Econoline Club Wagon models before installation. Proper torque specifications should be followed to secure the master cylinder and prevent leaks.

Quality Assurance and Warranty Information

Dorman manufactures the M390389 brake master cylinder to meet or exceed OEM standards for fit, form, and function. The aluminum construction and integrated sensor contribute to reliable performance under normal operating conditions. While specific warranty details are not provided here, Dorman typically offers limited warranties on their brake hydraulics components. Consult product documentation or the supplier for exact warranty terms.