It was, power drum-drum. The problem FIRST started when I put an MPBrakes rear disc kit on the rear, but it never went away when I replaced all those parts.

Now it's a totally different master, prop, lines, and calipers and rotors and tires and the problem remains, which is why I'm stumped!

It's like the damned rear discs were a virus my car caught that won't let any other brake work right!