Dorman M71285 Brake Master Cylinder

Reliable Brake Master Cylinder for Chevrolet and GMC Vehicles

The Dorman M71285 brake master cylinder is designed to restore proper brake hydraulics in select Chevrolet and GMC models. Engineered with a durable cast iron body and a built-in reservoir, this master cylinder ensures consistent brake fluid delivery for safe and effective braking performance.

Key Features of the Dorman M71285 Brake Master Cylinder

• Master cylinder bore diameter: 1.125 inches for precise hydraulic pressure
• Constructed from cast iron for long-lasting durability
• Includes an integrated reservoir for brake fluid storage
• Two outlet ports with a secondary outlet thread diameter of 0.5 inches
• Rearward outlet size of 9/16-18 for secure brake line connections
• Package contains the master cylinder only; mounting hardware not included

Detailed Product Description

The Dorman M71285 brake master cylinder is specifically designed for use in Chevrolet and GMC vehicles such as the Bel Air, Blazer, C10 Suburban, Camaro, Caprice, Impala, Jimmy, K10 Suburban, and Malibu. Its cast iron construction provides strength and resistance to wear, while the 1.125-inch bore diameter ensures proper hydraulic pressure for effective braking. The included reservoir simplifies installation and maintenance by housing the brake fluid directly on the master cylinder. With two outlets and a rearward outlet size of 9/16-18, this part supports reliable brake line connections without the need for additional adapters.

Common Applications and Issues Addressed

• Restores brake fluid pressure in vehicles experiencing soft or spongy brake pedal feel
• Replaces leaking or damaged master cylinders causing brake fluid loss
• Solves inconsistent braking performance due to worn internal seals
• Addresses brake system failure symptoms such as pedal sinking or poor stopping power
• Supports brake system rebuilds on compatible Chevrolet and GMC models

Installation Notes and Tips

• Ensure compatibility with your specific Chevrolet or GMC model before installation
• Brake system should be properly bled after installation to remove air from the lines
• Mounting hardware is not included; retain original hardware or source appropriate replacements
• Inspect brake lines and fittings for wear or damage during installation
• Follow manufacturer torque specifications for outlet fittings to prevent leaks

Quality Assurance and Warranty Information

Dorman manufactures the M71285 brake master cylinder to meet or exceed OEM standards for fit, form, and function. The cast iron construction and integrated reservoir contribute to the part's durability and reliability. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in materials and workmanship. Consult product documentation or contact the distributor for exact warranty terms.