Dorman M390089 Brake Master Cylinder

Reliable Brake Master Cylinder for Mitsubishi Montero Models

The Dorman M390089 brake master cylinder is designed specifically for Mitsubishi Montero and Montero Sport vehicles. Engineered with precision, this aluminum master cylinder includes a reservoir and features a 0.938-inch bore diameter to ensure consistent brake performance.

• Compatible with Mitsubishi Montero and Montero Sport models
• Constructed from durable aluminum material
• Includes reservoir for fluid storage
• Master cylinder bore diameter of 0.938 inches
• Two outlets with rearward outlet size M10 x 1.0 and 10mm secondary outlet thread diameter
• Thread pitch of 1.0 for secure connections
• Package contains the master cylinder only; mounting hardware not included

Product Details and Specifications

The Dorman M390089 brake master cylinder is crafted from aluminum, providing a balance of strength and corrosion resistance. It features a 0.938-inch bore diameter, which is critical for maintaining proper hydraulic pressure in the brake system. This master cylinder includes a reservoir, allowing for efficient brake fluid storage and management. The unit has two outlets, with the rearward outlet sized at M10 x 1.0 and a secondary outlet thread diameter of 10mm, both with a thread pitch of 1.0, ensuring compatibility with the brake lines on Mitsubishi Montero and Montero Sport vehicles. Note that mounting hardware is not included with this part.

Common Applications and Problem Resolution

• Restores proper brake fluid pressure and pedal feel
• Replaces leaking or damaged master cylinders
• Addresses brake fluid reservoir issues
• Fixes inconsistent braking performance
• Resolves brake pedal sinking or sponginess

Installation Notes and Tips

When installing the Dorman M390089 brake master cylinder, ensure the brake system is properly bled to remove air and maintain hydraulic integrity. Verify that the thread pitch and outlet sizes match the vehicle’s brake lines to avoid leaks. Since mounting hardware is not included, retain or source the appropriate hardware for secure installation. It is recommended to inspect related brake components during replacement to ensure overall system reliability.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit and function. The M390089 brake master cylinder undergoes rigorous quality control to ensure durability and performance. While specific warranty details are not provided here, Dorman typically offers limited warranties on their brake hydraulics products. Consult product documentation or the supplier for exact warranty terms.