I have 4 wheel Disc Wilwoods. Adjustable Prop valve on rear brakes. Set it to the middle of adjustment when I installed it years ago and have never touched it. Lots of street miles and plenty of track passes.....never a stopping issue. Brake pads look great and no abnormal wear, front or rear. The idea for rear adjustable was to have front brakes with full load from master and dial up or down the rears as needed, depending on stopping quality.