Hi, My girlfriends car has a problem with a stuck or leaking caliper. When she's braking hard the car breaks out a lot to the right. This is really really dangerous. I let a garage check the brake difference both on the front and the back. The difference on the front is 17-29% and on the back only 0-7%. So the problem is in the front. As far as we can see the left front caliper is leaking. We won't to rebuild this, but we're looking for a good how to on this. Can't imagine this would be a really difficult job. Can someone help me out? And what is the piston size? She has a car without ABS so i assume it's 48 mm instead of 51 mm?