Dorman M390336 Brake Master Cylinder

Reliable Brake Master Cylinder for Ford and Lincoln Vehicles

The Dorman M390336 Brake Master Cylinder is engineered to restore proper brake hydraulics in select Ford and Lincoln 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 optimal fluid displacement
• Constructed from durable aluminum material for corrosion resistance
• Includes reservoir and sensor for integrated brake system monitoring
• Features two outlets with rearward outlet size 7/16-24 and secondary outlet thread diameter 9/16-18
• Compatible with Ford Expedition, F-150, F-150 Heritage, F-250, F-250 HD, F-350, and Lincoln Navigator

Product Details and Specifications

This Dorman brake master cylinder (part number M390336) is designed specifically for brake hydraulics systems requiring a 1.25-inch bore diameter. The aluminum construction provides strength and resistance to wear and corrosion, extending the service life of the component. The included reservoir allows for proper brake fluid storage, while the integrated sensor supports brake system diagnostics and safety features. With two outlets, including a rearward outlet sized 7/16-24 and a secondary outlet thread diameter of 9/16-18, this master cylinder fits the brake line configurations of multiple Ford and Lincoln trucks and SUVs.

Compatible Vehicles and Applications

• Ford Expedition
• Ford F-150 and F-150 Heritage
• Ford F-250 and F-250 HD
• Ford F-350
• Lincoln Navigator

This part is ideal for restoring brake hydraulic function in these specific models, ensuring proper brake fluid pressure and pedal feel.

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
• Loss of brake pressure affecting stopping performance
• Brake warning light activation related to sensor faults
• Inconsistent brake pedal travel or responsiveness

Installation Notes and Tips

Installation of the Dorman M390336 master cylinder requires proper brake system bleeding to remove air and ensure optimal hydraulic pressure. Mounting hardware is not included, so reuse existing hardware or acquire compatible fasteners. Verify thread sizes for brake line connections: rearward outlet 7/16-24 and secondary outlet 9/16-18. Sensor connections should be carefully reattached to maintain brake system monitoring functions.

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 brake system performance. While specific warranty details are not provided here, Dorman typically offers limited warranties on their brake hydraulics components to cover defects in materials and workmanship.