Black Master and Valve Combination

The Right Stuff Detailing Black Master and Valve Combination (B5672) is a complete brake master cylinder and proportioning valve assembly designed for GM X-Body vehicles from 1962 to 1968. This combination kit delivers integrated hydraulic control in a single, compact unit, eliminating the need for separate sourcing and installation of individual brake components.

The kit includes an integral reservoir to hold brake fluid and a proportioning valve to balance hydraulic pressure between front and rear brake circuits—a critical function for preventing rear-wheel lockup during hard braking and maintaining consistent stopping power across the entire vehicle. The screw-on cover design allows straightforward fluid level checks and maintenance without removing the entire assembly. The disc/disc configuration indicates this master cylinder is engineered for vehicles equipped with disc brakes on both front and rear axles, a common upgrade on classic X-Body restorations seeking improved braking performance over original drum brake setups.

This assembly is ideal for restorers and builders working on 1962–1968 Chevrolet Chevy II, Pontiac Acadian, Oldsmobile F-85, or Buick Special models. Whether undertaking a complete brake system modernization or replacing a failed original master cylinder, this combination unit simplifies the brake line layout and reduces installation complexity. Weighing 7.85 lbs and measuring 8.5 x 8.4 x 8.9 inches, the compact footprint fits within original engine bay constraints while delivering modern hydraulic reliability and stopping consistency.