We use adjustable s on the race car. What they are for . They work great when applying brakes with the same motion and pressure on controlled race surface. There is nothing like a self adjusting prop valve on the street where braking applications change as per reactions to traffic incidents. Good luck getting that manual valve set up and changed for different road conditions and braking reflex.
Also With the factory prop valve If you lose a front hose or caliper or a rear wheel cylinder. The valve closes off that side of the system allowing braking to work on opposite end. With the manual adjuster and the drum - drum tee you will be **** out of luck. Been there.
Like I said good for a race car. Not for the street. Read the warnings when you get it. I have seen brakes fail to many times over the years. And know the importance of the proportioning valves. Good luck and never say you were not for warned.
The Proportioning valves I have are polished and re O-ringed all line ends and diverter and brake switches are tested. Since this post I sold all but one that is done. The rest are cheaper but are as is the way they were removed.
