7in Dual Power Booster 1-1/8 in Bore Master

The LEED BRAKES 7in Dual Power Booster 1-1/8 in Bore Master Cylinder is a complete hydraulic brake assembly designed for classic GM A-Body vehicles from 1955–1968. This integrated master cylinder and booster combination features a dual integral reservoir, single diaphragm booster design, and proportioning valve—all engineered to deliver responsive braking performance on vintage muscle cars, hot rods, and restoration projects. The 7-inch outer diameter booster and 1.125-inch bore cylinder provide the hydraulic capacity and leverage needed for confident stopping power on modern driving conditions while maintaining OEM-correct fitment.

This master cylinder and booster assembly is constructed from steel with a gold zinc plating that resists corrosion and extends service life in varied climate conditions. The proportioning valve integral to the design helps balance front and rear brake pressure, improving modulation and reducing the risk of rear-wheel lockup during hard braking. The dual reservoir configuration provides circuit redundancy—if one hydraulic circuit fails, the secondary remains functional. At 27.45 pounds, the complete unit integrates smoothly into existing A-Body brake systems without requiring extensive fabrication or modification.

Builders and restorers working on 1955–1968 Chevrolet A-Body platforms—including the Chevy II, Nova, and similar models—rely on this kit to upgrade aging drum or early power braking systems. The assembly is ideal for drivers who want modern stopping confidence without compromising the original engine bay appearance or OEM-style installation. Whether upgrading a street rod, daily-driver classic, or high-performance restoration, this LEED BRAKES master cylinder delivers the hydraulic foundation for reliable braking across a wide range of driving scenarios.