Vince's car at Willow Springs on Friday 12/2/2011.
It has a 7/8" master cylinder for the front brakes, 3/4" cylinder for the rear. No proportioning valve. When we set the balance bar all the way in the direction favoring front brake brake bias, the car still locks up the rear brakes when testing at low speed (10-15 MPH) in the paddock area. I'm concerned that changing the rear cylinder to a smaller, or front cylinder to a larger may result in the balance bar contacting the outer tubular housing of the balancer assembly. It is possible that the cure for the compromise is to install an adjustable proportioning valve in the line going to the rear.