By chance, was there new master installed recently? I had one with the adjustable push rod that was a tad to long. Shortened up a couple of turns on the ball, that gave it the clearence it needed, no more dragging brakes. (It will be on the master end of the push rod, it would have a threaded shank and a set of flats like a bolt head would have. A 1/4 or 5/16 wrench will likely fit it. You will need to unbolt the master and move it ahead to see if it is the adjustable style push rod. I don't know of any other way to check. Sniper