I held off a day to see if anyone with a better answer jumped in. I think though you don't really have a probelm. The brake assembly only has one piston on the front side. The whole thing must be free to move side to side on the two mounting shoulder bolts. As long as the calipers can move on these screws you should be OK. Next time you change the pads or have the wheel off just be sure it is free to move.