Upgrade your 1973 - 1993 Chevrolet or GMC truck to an 11" single diaphragm power brake booster,1-1/8" bore master cylinder, and 4 wheel disc brake proportioning valve. The included Mounting Kit allows you to mount the proportioning valve to the Left (Driver's Side) of the master cylinder and brake booster, and includes two hard lines that connect the master cylinder (with 9/16" & 1/2" ports) to the proportioning valve.
