Dorman M39975 Brake Master Cylinder

Reliable Brake Master Cylinder Replacement for Your Vehicle

The Dorman M39975 Brake Master Cylinder is engineered to restore proper brake hydraulics performance in compatible vehicles. Designed with precision, this aluminum master cylinder includes a reservoir and sensor to ensure efficient braking response and safety.

• Master cylinder bore diameter: 0.938 inches for accurate hydraulic pressure
• Constructed from durable aluminum material for corrosion resistance
• Includes reservoir and sensor for integrated brake fluid management
• Four outlet ports with rearward outlet size M10 x 1.0 and thread pitch 1.0
• Secondary outlet thread diameter of 10 mm for secure connections
• Package contains the master cylinder only; mounting hardware not included

Detailed Product Features and Specifications

The Dorman M39975 master cylinder is designed to meet or exceed OEM specifications, featuring a 0.938-inch bore diameter that ensures consistent hydraulic pressure for reliable brake operation. Its aluminum construction offers enhanced durability and resistance to corrosion, which is critical for long-term brake system performance. The included reservoir allows for proper brake fluid storage, while the integrated sensor monitors fluid levels to alert drivers of potential issues. With four outlets, including a rearward outlet sized M10 x 1.0 and a secondary outlet thread diameter of 10 mm, this master cylinder supports complex brake hydraulic systems found in various vehicle models.

Common Applications and Problem Resolution

• Restores brake pressure in vehicles experiencing spongy or unresponsive brakes
• Replaces master cylinders with leaking or damaged reservoirs
• Addresses brake fluid level sensor malfunctions to maintain safety alerts
• Solves issues related to worn or corroded aluminum master cylinders
• Supports brake systems requiring multiple outlet connections for proper fluid distribution

Installation Notes and Tips

Installation of the Dorman M39975 master cylinder requires careful attention to brake line connections, especially the four outlet ports and sensor wiring. Since mounting hardware is not included, ensure you have the correct bolts and fittings for your specific vehicle. Bleeding the brake system thoroughly after installation is essential to remove air and restore optimal brake function. Consult your vehicle’s service manual for torque specifications and sensor calibration procedures.

Quality Assurance and Warranty Information

Dorman manufactures the M39975 master cylinder to meet stringent quality standards, using durable aluminum and precision machining. The included sensor and reservoir are tested for compatibility and reliability. While mounting hardware is not provided, the master cylinder itself is backed by Dorman’s limited warranty, covering defects in materials and workmanship under normal use conditions.