Dorman M390390 Brake Master Cylinder

Overview of Dorman Brake Master Cylinder M390390

The Dorman Brake Master Cylinder M390390 is designed specifically for Ford E-350 Econoline models, providing reliable brake hydraulics performance. This master cylinder features an integrated reservoir and sensor to ensure optimal brake system functionality.

• Compatible with Ford E-350 Econoline
• Master cylinder bore diameter: 1.25 inches
• Constructed from durable aluminum material
• Includes reservoir and sensor for enhanced monitoring
• Three outlets with specified thread sizes for precise fitment
• Rearward outlet size: 9/16-18
• Secondary outlet thread diameter: 7/16-24
• Mounting hardware not included

Detailed Product Description

The Dorman M390390 brake master cylinder is engineered with a 1.25-inch bore diameter to match the hydraulic requirements of the Ford E-350 Econoline. Its aluminum construction offers corrosion resistance and durability under demanding conditions. The included reservoir allows for proper brake fluid storage, while the integrated sensor provides real-time feedback to the vehicle’s brake system. Featuring three outlets, including a rearward outlet sized at 9/16-18 and a secondary outlet with a 7/16-24 thread diameter, this master cylinder ensures precise hydraulic connections for effective brake pressure distribution.

Common Applications and Problem Resolution

• Restores proper brake fluid pressure in Ford E-350 Econoline brake systems
• Replaces worn or leaking master cylinders causing brake pedal issues
• Addresses brake fluid reservoir leaks or sensor malfunctions
• Solves inconsistent brake pedal feel or reduced braking efficiency
• Ensures compatibility with factory brake hydraulics setup

Installation Notes and Tips

Installation of the Dorman M390390 master cylinder requires careful attention to brake line connections and sensor wiring. Since mounting hardware is not included, retain original fasteners or source appropriate replacements. Bleed the brake system thoroughly after installation to remove air and ensure proper hydraulic function. Verify sensor operation with diagnostic tools to confirm correct brake system communication.

Quality Assurance and Warranty

Dorman manufactures the M390390 master cylinder to meet or exceed OEM specifications for the Ford E-350 Econoline. The aluminum construction and integrated components undergo rigorous quality control to ensure durability and performance. Warranty coverage details should be confirmed at the point of purchase, as they may vary by distributor.