Dorman M390530 Brake Master Cylinder

Reliable Brake Master Cylinder for Ford Excursion and Super Duty

The Dorman M390530 Brake Master Cylinder is engineered to restore proper brake hydraulics in Ford Excursion, F-250 Super Duty, and F-350 Super Duty models. Designed with precision, this master cylinder ensures consistent brake fluid pressure for safe and effective braking performance.

• Master cylinder bore diameter of 1.375 inches for accurate hydraulic control
• Durable aluminum construction for corrosion resistance and long service life
• Includes reservoir and sensor for integrated brake fluid management
• Three outlets with specific thread sizes: rearward outlet 7/16-24, secondary outlets 9/16-18 and 3/8-24
• Compatible with Ford Excursion, F-250 Super Duty, and F-350 Super Duty vehicles

Product Details and Specifications

The Dorman M390530 master cylinder features a 1.375-inch bore diameter, providing the necessary hydraulic pressure for the braking system. Constructed from aluminum, it offers resistance to corrosion and heat, which helps maintain consistent performance under demanding conditions. This unit includes a reservoir and sensor, allowing for seamless integration with the vehicle’s brake fluid monitoring system. The master cylinder has three outlets, including a rearward outlet sized 7/16-24 and secondary outlets with thread diameters of 9/16-18 and 3/8-24, ensuring compatibility with the brake lines on Ford Excursion and Super Duty trucks.

Common Applications and Problem Resolution

• Restores brake fluid pressure in Ford Excursion and Super Duty brake systems
• Replaces worn or leaking master cylinders causing brake pedal sponginess
• Addresses brake fluid leaks from damaged or corroded master cylinders
• Resolves brake warning light issues related to faulty sensors in the master cylinder
• Improves overall brake system responsiveness and safety

Installation Notes and Tips

Installation of the Dorman M390530 master cylinder requires proper brake fluid handling and bleeding procedures to avoid air in the brake lines. Ensure the vehicle is securely supported and the brake system is depressurized before removal of the old master cylinder. Since mounting hardware is not included, retain or source the necessary bolts and fittings. Verify thread sizes on brake lines match the master cylinder outlets for a secure fit. After installation, perform a thorough brake system bleed to restore full hydraulic function.

Quality Assurance and Warranty

Dorman manufactures the M390530 master cylinder to meet or exceed OEM specifications for Ford Excursion, F-250 Super Duty, and F-350 Super Duty models. The aluminum construction and integrated sensor contribute to reliable operation and durability. While specific warranty details are not provided, Dorman products typically come with a limited warranty covering defects in materials and workmanship.