I did the disc brake conversion, like everybody has done. I had a horrible time bleeding the rear calipers, we tried everything, bled them on & off, and power bled them on & off. Well this buddy of mine that worked at the Chevy dealer in Sioux City fo years, took the rod between the hydrovac & pedel, and turned (cut) the part of the threaded sleeve off, that wasn't threaded. He then put a thin jam nut in there, and put it back togeather, but made it a couple of threads longer when he put it back in. Belive it or not, this cured my problem! My pedal isn't soft, and I have brakes like I have never had before.