I was just scrolling along in here, searching for ideas. My front calipers were licking down and not releasing (all 4 brakes are all new). I popped the MC lose from the booster and BAM! everything's fine. bolted it back up and lock up :-( Come to find out (stupid me), brake pedal was returning enough to turn off the brake light switch but still engaging the MC. I hooked up a return spring and all problems fixed. I don't even know if my Dart Swinger was supposed to have a return spring. Anyone?
