Dorman M390023 Brake Master Cylinder

Reliable Brake Master Cylinder for Mazda Miata

The Dorman M390023 brake master cylinder is engineered to restore proper brake hydraulics for Mazda Miata vehicles. Designed with precision, this aluminum master cylinder includes a reservoir and sensor to ensure consistent brake performance and safety.

• Master cylinder bore diameter: 0.875 inches for accurate hydraulic pressure
• Constructed from durable aluminum material for corrosion resistance
• Includes reservoir for fluid storage and management
• Equipped with a sensor to monitor brake fluid levels
• Two outlet ports with rearward outlet size M10 x 1.0 and thread pitch 1.0
• Secondary outlet thread diameter of 10 mm
• Package contains the master cylinder only; mounting hardware not included

Product Details and Specifications

The Dorman M390023 brake master cylinder is specifically designed for Mazda Miata models, providing a precise fit and reliable brake hydraulics function. Its 0.875-inch bore diameter ensures proper hydraulic pressure for effective braking response. The aluminum construction offers durability and resistance to corrosion, extending the service life of the component. This master cylinder comes with an integrated reservoir to hold brake fluid and a sensor to monitor fluid levels, helping maintain optimal brake system performance. Featuring two outlets, including a rearward outlet sized M10 x 1.0 with a 1.0 thread pitch and a secondary outlet thread diameter of 10 mm, this part supports the brake hydraulic system's fluid distribution requirements.

Common Applications and Problem Resolution

• Restores brake pressure loss due to worn or damaged master cylinder
• Eliminates brake fluid leaks from the master cylinder reservoir or outlets
• Resolves brake pedal sinking or sponginess caused by internal cylinder wear
• Replaces faulty brake fluid level sensor to ensure accurate monitoring
• Addresses inconsistent braking performance in Mazda Miata brake hydraulics

Installation Notes and Tips

When installing the Dorman M390023 brake master cylinder on a Mazda Miata, ensure the brake system is properly bled to remove air and maintain hydraulic integrity. Verify compatibility with your specific model year before installation. Since mounting hardware is not included, retain or source the necessary components for secure installation. Handle the aluminum master cylinder carefully to avoid damage to the sensor and outlet threads during installation.

Quality Assurance and Warranty

Dorman manufactures this brake master cylinder to meet or exceed OEM specifications for Mazda Miata brake hydraulics. The part undergoes rigorous quality control to ensure durability and reliable performance. While specific warranty details are not provided, Dorman products typically come with a limited warranty covering defects in materials and workmanship.