Although our Camaro originally had dual-circuit braking, the junction block mounted below the original master cylinder was simply a splitter, not a proportioning valve. The Baer system uses an adjustable proportioning valve in the rear brake line to reduce pressure to the rear brakes as needed to balance the system. Baer recommends starting by seating the valve (fully tight) and backing it out five turns. Final adjustment will be made during the testdrive. The goal is to keep the rear wheels from locking under hard braking.