I drive a 1980 BMW 528i and my front disc brakes are squeaking horribly so I thought it might be time to change the pads... I started to take out the caliper bolts and brake fluid started leaking out. I tightened it back up and the leak stopped. I tried to drive the car, but too much fluid leaked out I guess and there's no compression left. Would this be a leak around the piston? Is it possible to fix this myself and if so.. how??