Dorman M101267 Brake Master Cylinder

Reliable Brake Master Cylinder for Cadillac, Chevrolet, and GMC Vehicles

The Dorman M101267 brake master cylinder is engineered to restore proper brake hydraulics in select Cadillac, Chevrolet, and GMC models. Designed with a durable cast iron construction and a 1.125-inch bore diameter, this master cylinder ensures consistent brake fluid pressure for safe stopping performance.

• Master cylinder bore diameter: 1.125 inches
• Constructed from cast iron for durability
• Includes reservoir for brake fluid
• Two outlet ports with rearward outlet size 1/2-20 and secondary outlet thread diameter 9/16-18
• Compatible with multiple Cadillac, Chevrolet, and GMC truck and SUV models
• Mounting hardware not included

Product Details and Specifications

The Dorman M101267 brake master cylinder features a cast iron body that provides strength and resistance to wear under demanding braking conditions. Its 1.125-inch bore diameter is designed to match original equipment specifications, ensuring proper hydraulic pressure and pedal feel. The included reservoir allows for easy brake fluid monitoring and maintenance. This master cylinder has two outlets: a rearward outlet sized 1/2-20 and a secondary outlet with a 9/16-18 thread diameter, compatible with the brake lines on the specified vehicles.

Compatible Cadillac, Chevrolet, and GMC Models

This brake master cylinder is compatible with a range of full-size trucks and SUVs, including the Chevrolet C10 Suburban, C20, C20 Suburban, C1500 Suburban, C2500, and C2500 Suburban. It also fits GMC models such as K10 Suburban, K20, K20 Suburban, K1500 Suburban, K2500, and K2500 Suburban, as well as P20 and P2500. Additionally, it suits Cadillac DeVille and Fleetwood models, providing a reliable replacement option for these vehicles.

Common Brake System Issues Addressed

• 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 master cylinder failure
• Reduced braking efficiency in Cadillac, Chevrolet, and GMC trucks and SUVs

Installation Notes and Tips

Installation of the Dorman M101267 brake master cylinder requires proper brake system bleeding to remove air and ensure optimal hydraulic function. Since mounting hardware is not included, retain original fasteners or source compatible hardware. Verify outlet thread sizes (1/2-20 rearward and 9/16-18 secondary) to ensure brake line compatibility. It is recommended to inspect brake lines and related components during installation for any signs of wear or damage.

Quality Assurance and Warranty

Dorman brake master cylinders are manufactured to meet or exceed OEM standards for fit, form, and function. The M101267 part is backed by Dorman's quality assurance processes to provide reliable performance. Please refer to Dorman's official warranty policy for specific coverage details.