Dorman M39023 Brake Master Cylinder

Overview of Dorman Brake Master Cylinder M39023

The Dorman Brake Master Cylinder M39023 is designed for reliable brake hydraulics performance in select Buick, Chevrolet, Oldsmobile, and Pontiac vehicles. This cast iron master cylinder includes a reservoir and is engineered to meet the specific needs of models like the Camaro, Firebird, Nova, Omega, Phoenix, and Skylark.

• Master cylinder bore diameter: 1 inch
• Constructed from durable cast iron material
• Includes reservoir for brake fluid
• Two outlet ports with rearward outlet size of 9/16-18
• Secondary outlet thread diameter of 0.5 inches
• Package contains the master cylinder only; mounting hardware not included
• Sensor not included

Detailed Product Description

The Dorman M39023 brake master cylinder is a cast iron component designed to provide consistent hydraulic pressure for the braking system. Its 1-inch bore diameter ensures proper fluid displacement, while the included reservoir allows for efficient brake fluid storage and management. The master cylinder features two outlets, including a rearward outlet sized at 9/16-18 and a secondary outlet with a 0.5-inch thread diameter, facilitating compatibility with the brake lines of various GM vehicles. This part is specifically compatible with Buick, Chevrolet, Oldsmobile, and Pontiac models such as the Camaro, Firebird, Nova, Omega, Phoenix, and Skylark, making it a suitable replacement for maintaining brake system integrity.

Common Applications and Issues Addressed

• Restores proper brake fluid pressure in hydraulic brake systems
• Replaces worn or leaking master cylinders causing brake pedal sponginess
• Fixes brake fluid leaks from the master cylinder reservoir or outlets
• Addresses brake failure symptoms related to internal cylinder wear
• Improves brake system responsiveness in compatible Buick, Chevrolet, Oldsmobile, and Pontiac models

Installation Notes and Tips

• Ensure brake system is fully depressurized before removal
• Bleed the brake system thoroughly after installation to remove air
• Use compatible brake fluid as specified by the vehicle manufacturer
• Verify outlet thread sizes match existing brake lines (rearward outlet 9/16-18, secondary outlet 0.5 inch)
• Mounting hardware is not included; retain original hardware or source separately

Quality Assurance and Warranty

Dorman manufactures the M39023 brake master cylinder to meet or exceed OEM specifications for durability and performance. The cast iron construction provides long-lasting strength under typical operating conditions. While mounting hardware and sensors are not included, the product undergoes quality checks to ensure proper fitment and function. Warranty details should be confirmed through the point of purchase or Dorman's official documentation.