Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › 2009 Caravan Rear Calipers › 2009 Caravan Rear Calipers June 5, 2012 at 11:00 am #439637 college manModerator I thought caliper pistons were self adjusting? when you did the job. did you have the special piston tool to reset the piston? those pistons are screw drive. usually once the brake pedal is applied the piston releases. was this done before driving?