Dorman M630391 Brake Master Cylinder

Reliable Brake Master Cylinder for Ford E-Series Vans

The Dorman M630391 Brake Master Cylinder is designed specifically for Ford E-150, E-150 Econoline, E-250, and E-350 Super Duty models. This master cylinder ensures consistent brake fluid pressure and reliable braking performance for your vehicle's hydraulic brake system.

• Master cylinder bore diameter: 1.313 inches for precise fluid control
• Constructed from durable aluminum material for corrosion resistance
• Includes reservoir and sensor for complete brake system integration
• Equipped with three outlets to support complex brake line configurations
• Rearward outlet size: 9/16-18; secondary outlet thread diameters: 7/16-24 and 3/8-24
• Package contains the master cylinder unit; mounting hardware not included

Product Details and Specifications

The Dorman M630391 brake master cylinder is engineered with a 1.313-inch bore diameter to maintain optimal hydraulic pressure within the brake system. Its aluminum construction offers enhanced durability and resistance to corrosion, which is critical for long-term brake system reliability. This unit comes complete with an integrated reservoir and sensor, allowing for seamless monitoring and fluid management. The master cylinder features three outlets, including a rearward outlet sized at 9/16-18 and secondary outlets with thread diameters of 7/16-24 and 3/8-24, accommodating the specific brake line requirements of Ford E-Series vans.

Compatible Vehicles and Applications

This brake master cylinder is compatible with the following Ford models:

• Ford E-150
• Ford E-150 Econoline
• Ford E-250
• Ford E-350 Super Duty

It is designed to replace the original equipment part and restore proper brake hydraulics for these vehicles.

Common Issues Addressed by This Master Cylinder

• Brake pedal sinking or sponginess due to internal leaks
• Brake fluid leaks around the master cylinder area
• Inconsistent brake pressure causing uneven braking
• Warning lights triggered by faulty brake fluid sensors
• Reduced braking performance in Ford E-Series vans

Installation Notes and Tips

Installation of the Dorman M630391 master cylinder requires proper brake system bleeding to remove air and ensure optimal performance. Note that mounting hardware is not included, so retain original fasteners or acquire appropriate replacements. Verify compatibility with your specific Ford E-Series model before installation. Sensor connections should be carefully reattached to maintain brake fluid level monitoring.

Quality Assurance and Warranty

Dorman manufactures this brake master cylinder to meet or exceed OEM specifications for fit, form, and function. The aluminum construction and integrated sensor contribute to reliable operation. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in material and workmanship. Consult product documentation for exact warranty terms.