I think the residual valve may be your problem, and I think we have the same problem with my Son's T. He has GM discs on the front and they seem to be dragging all the time. You can turn the wheel, but it takes some effort. We have a 2# valve in line, and maybe the one in the M/C is doubling up on the pressure to the caliper.

I think I'll take the guts out of the residual valve and see how that works. Thanks for giving me this idea.

Don