Hi I'm new to the Forum so here we go. Recently I changed the brakes and rotors on my 2004 MC40. I used Powerslots and Hawk pads. It needed to be done but prior to doing it there seemed to be significant sound coming from the brakes. Almost as if the pistons in the calipers weren't retracting. I took everything apart, cleaned everything, checked that the pistons where moving freely, then installed the new stuff only to find the same dragging sound still presists. It's something at the wheels as when I coast the sound stops as the car comes to a stop. Are the calipers rebuildable (seals)? Should this be done? Could it be wheel bearings? The car has 75,000 miles on it. Thanks