Dorman M39589 Brake Master Cylinder

Reliable Brake Master Cylinder for Chevrolet and GMC Trucks

The Dorman M39589 brake master cylinder is engineered to restore proper brake hydraulics for Chevrolet and GMC trucks, including C10, C1500, R10, and Suburban models. Designed with durable aluminum construction and a dual bore design, this master cylinder ensures consistent braking performance.

• Compatible with Chevrolet and GMC C10, C1500, R10, R10 Suburban, R1500, R1500 Suburban, V10, V10 Suburban, V1500, and V1500 Suburban models
• Dual master cylinder bore diameters: 24.4 mm and 36 mm for balanced hydraulic pressure
• Constructed from corrosion-resistant aluminum material
• Includes reservoir for fluid storage
• Two outlet ports with rearward outlet size 1/2-20 and secondary outlet thread diameter 9/16-18
• Mounting hardware not included

Product Details and Specifications

The Dorman M39589 brake master cylinder features a dual bore design with bore diameters of 24.4 mm and 36 mm, providing precise hydraulic pressure control for the front and rear brake circuits. Its aluminum construction offers durability and resistance to corrosion, extending the service life of the component. The included reservoir allows for proper brake fluid containment and monitoring. This master cylinder has two outlets, with a rearward outlet size of 1/2-20 and a secondary outlet thread diameter of 9/16-18, ensuring compatibility with the brake lines on specified Chevrolet and GMC truck models.

Common Applications and Problem Resolution

• Restores brake hydraulic pressure in Chevrolet and GMC C10 and C1500 trucks
• Replaces worn or leaking master cylinders causing brake fluid loss
• Addresses spongy or unresponsive brake pedal issues
• Fixes brake fluid contamination or reservoir damage
• Improves overall brake system reliability on R10 and Suburban models

Installation Notes and Tips

Installation of the Dorman M39589 brake master cylinder requires proper brake fluid handling and bleeding procedures to avoid air in the brake lines. Since mounting hardware is not included, retain or source compatible bolts and fittings for secure installation. Verify outlet thread sizes (1/2-20 rearward and 9/16-18 secondary) to ensure correct brake line connections. It is recommended to inspect brake lines and related components during installation for optimal system performance.

Quality Assurance and Warranty Information

Dorman manufactures the M39589 brake master cylinder to meet or exceed OEM specifications for fit, form, and function. The aluminum construction and precise bore diameters contribute to consistent braking performance and durability. While mounting hardware is not included, the product is backed by Dorman's quality standards. Please consult Dorman's warranty policy for specific coverage details.