Ok, recently removed a lift off of my c2500 suburban with hydroboost brake system. only 150k miles. It was fine for a couple days but now the front brakes are dragging badly and they won't release. The pedal gets firmer and firmer as you drive and the truck gets warm. Ive ordered new calipers and front brake lines in case one seized or a line is collapsing, but both front brakes lock up equally as bad. The rear drums aren't dragging. But i don't know much about hydroboost, could it be the MC?