Dorman M390347 Brake Master Cylinder

Brake Master Cylinder for Pathfinder and QX4

Dorman M390347 is a brake master cylinder built for specific Nissan Pathfinder and INFINITI QX4 applications. It uses a 1-inch bore, an aluminum body, and an included reservoir and sensor to match the original hydraulic setup on the listed vehicles.

Key Features

• Direct replacement brake master cylinder for select 1996-2001 Nissan Pathfinder and 2001 INFINITI QX4 models
• 1-inch master cylinder bore diameter for the listed drum brake wheel cylinder applications
• Aluminum master cylinder construction
• Reservoir included
• Sensor included
• Two outlets with M10 x 1.0 rearward outlet thread size
• Dorman M390347 brake master cylinder for OE-style hydraulic fitment

Detailed Description

This Dorman brake master cylinder is precision-engineered to match the design, function, and performance of the original master cylinder on the specified vehicles. The aluminum housing and new, high-quality materials support a durable hydraulic replacement for brake system service. Dorman M390347 is a practical choice when replacing a worn or leaking master cylinder on a Nissan Pathfinder or INFINITI QX4 with the listed brake configuration.

This part cross-references Raybestos Brakes MC390347 for the same application.

What It Helps Address

• Brake pedal that sinks or feels inconsistent
• External brake fluid leakage at the master cylinder
• Loss of hydraulic pressure in the brake system
• Uneven or delayed brake response
• Service replacement for a worn original master cylinder

Installation Notes and Tips

Verify the vehicle year, make, model, and brake configuration before installation. This master cylinder has two outlets, a 1-inch bore, and M10 x 1.0 rearward outlet threading. Mounting hardware is not included. Proper bench bleeding and system bleeding are recommended after installation to remove trapped air and restore pedal feel.

Quality Assurance

Dorman manufactures this master cylinder as a new replacement part using high-quality materials and OE-style design targets for the listed applications. Confirm fitment against the vehicle and brake system details before ordering.