I recently did the rear drums/shoes of my Silverado. When I was replacing shoes I accidentally pushed piston in wheel cylinder too far on one direction and some brake fluid trickled out. After an oh [censored] I immediately put it back. Do we think there's a problem that will be caused by this? Also, almost immediately, it seemed like the new drums were warped. Is it possible for drums to be warped out of the box? These were the OEM GM ACDelcos (not the "professional" or "advantage" line).