Proforged Brake Proportioning Valve 112-10001The Chevy B Body had drum brakes from 1977 93 disc brakes were introduced to the platform in 1994, but GM kept same brake proportioning valve, and as a result the rear brakes are greatly underutilized on the Impala SS and Caprice. Proforged's Stealth Brake Bolt Kit changes the brake bias from an estimated 95% front 5% rear to 65% front 35% rear. It also reduces brakes dive by eliminating the delay in onset for the rear brakes evening out pad wear and