Dorman M39976 Brake Master Cylinder

Reliable Brake Master Cylinder for Nissan D21, Pathfinder, and Pickup

The Dorman M39976 brake master cylinder is engineered to restore proper brake hydraulics for Nissan D21, Pathfinder, and Pickup models. Designed with precision, this aluminum master cylinder includes a reservoir and sensor to ensure consistent braking performance.

Key Features of the Dorman M39976 Brake Master Cylinder

• Master cylinder bore diameter: 1 inch for accurate hydraulic pressure
• Durable aluminum construction for corrosion resistance and longevity
• Includes reservoir for fluid storage and easy maintenance
• Equipped with a sensor to monitor brake system status
• Three outlets with a rearward outlet size of M10 x 1.0 and thread pitch of 1.0
• Secondary outlet thread diameter of 10 mm for secure connections
• Package contains the master cylinder only; mounting hardware not included

Detailed Product Description

The Dorman M39976 brake master cylinder is specifically designed for Nissan D21, Pathfinder, and Pickup vehicles, providing a direct replacement for the original component. Its 1-inch bore diameter ensures proper hydraulic pressure is maintained throughout the brake system. Constructed from aluminum, this master cylinder offers enhanced durability and resistance to corrosion, which is critical for maintaining brake system integrity over time. The included reservoir simplifies brake fluid management, while the integrated sensor allows for real-time monitoring of brake system performance. With three outlets and precise thread specifications, this master cylinder supports secure and reliable brake line connections.

Common Applications and Issues Addressed

• Restores brake hydraulic pressure for Nissan D21, Pathfinder, and Pickup models
• Replaces worn or leaking master cylinders causing brake fluid loss
• Fixes brake pedal sponginess or failure due to internal cylinder wear
• Resolves sensor-related brake warning light issues
• Addresses corrosion or damage to original aluminum master cylinders

Installation Notes and Tips

• Ensure brake system is properly bled after installation to remove air
• Verify thread pitch (1.0) and outlet sizes (M10 x 1.0) match vehicle brake lines
• Use appropriate brake fluid as specified by Nissan for your model
• Mounting hardware is not included; reuse original hardware or source separately
• Check sensor connections carefully to maintain brake warning system functionality

Quality Assurance and Warranty Information

Dorman manufactures the M39976 brake master cylinder to meet or exceed OEM specifications for Nissan D21, Pathfinder, and Pickup vehicles. The aluminum construction and integrated sensor are tested for durability and performance. While mounting hardware is not included, the product is backed by Dorman's quality standards. Please refer to Dorman's warranty policy for specific coverage details.