I am using a adjustable valve in my brake system. The truck has 73-77 Camero front disk and rear drum brakes with a Mustage 67-69 ??? manual disk mastercylinder. The Mustage II's had the wronge bore size which made the pedal to soft. With the bigger cylinder the rears would lock to easy in a 1/2 way panic stop. Full panic/slam it to the floor, they would totaly lock up and just slide along. The valve let me limit some pressure to the rears. Now they don't lock, but it takes more pressure on the pedal to get it to stop. I suppose with power assist you might not notice the extra effort.
Talk to the brake parts vendors and get there recomendations. They do this all the time. You don't have to buy they stuff! Joe
