Well, I was doing my brake cleaning today on the front brakes. I noticed that a few of the pistons move slower than the others while pumping, and a couple of them are just stuck in open position. Is there any way I could get the stuck pistons to move again or should I be looking into buying new calipers? I tried brake cleaner and tooth brush to clean crap out of the calipers, but no luck. Any ideas would be much appreciated.