Dorman M21000 Brake Master Cylinder

Reliable Brake Master Cylinder for Classic GM Vehicles

The Dorman M21000 brake master cylinder is engineered to restore proper brake hydraulics in select Cadillac, Chevrolet, Oldsmobile, and Pontiac models. Designed with durable cast iron and a built-in reservoir, this master cylinder ensures consistent brake fluid delivery for safe stopping performance.

• Master cylinder bore diameter: 1 inch for precise hydraulic pressure
• Constructed from cast iron for long-lasting durability
• Includes reservoir for brake fluid storage
• Two outlets with rearward outlet size of 7/16-24 for secure brake line connections
• Package contains the master cylinder only; mounting hardware not included

Durable Cast Iron Construction and Precise Hydraulic Design

The Dorman M21000 brake master cylinder features a 1-inch bore diameter crafted from cast iron, providing strength and resistance to wear. Its integrated reservoir simplifies brake fluid management, while the two outlets with 7/16-24 rearward threads allow for reliable attachment to brake lines. This part is designed specifically for classic GM vehicles including Cadillac DeVille, Eldorado, Chevrolet Bel Air, Impala, Corvette, Oldsmobile 98, Pontiac Bonneville, Catalina, Laurentian, and Parisienne models, ensuring compatibility and proper fitment.

Compatible Vehicles and Common Applications

This brake master cylinder is compatible with a range of classic GM cars, making it suitable for restoration or maintenance projects. It addresses issues such as:

• Brake pedal sinking or sponginess due to master cylinder wear
• Brake fluid leaks from a damaged or corroded master cylinder
• Inconsistent brake pressure affecting stopping performance
• Brake warning light activation related to hydraulic system faults
• Replacement during brake system overhaul or upgrade

Installation Notes and Tips

Installation of the Dorman M21000 requires careful attention to brake line connections and proper bleeding of the brake system to remove air. Note that mounting hardware is not included, so existing hardware should be inspected and replaced if necessary. Ensure compatibility with your specific vehicle model and year before installation.

Quality Assurance and Warranty Information

Dorman manufactures this brake master cylinder to meet or exceed OEM specifications, using cast iron for durability and reliability. While mounting hardware is not included, the product undergoes quality checks to ensure proper fit and function. Warranty details can be obtained from the product documentation or Dorman directly.