Try bleeding your brake lines, you may have some gunk in there.
The piston is not stuck. It must be rotated to retract it. There are two depressions on the piston face. Use a pair of needle nose pliars to turn the piston clockwise to retract it. Turn it until the face of the piston is flush with the boot.
You cant, it needs a 'C' clamp.
Compressing the rear brake caliper piston on a 2008 Chrysler Town and Country requires a special tool that pushes in and turns the piston at the same time.
It helps re-fit to slide it back a fraction.
a special scanner called a v.a.g. has to be used to retract the electronic e brake system, and will also retract caliper piston..DO NOT TRY WITH OUT TOOL !!!!!
If it is the front brake use a "C" clamp to retract piston If it is the rear and the parking brake is used by this caliper piston is threaded and a special tool (not expensive) available at Sears or auto parts to "screw" piston into caliper body
Clockwise to retract piston into caliper body
Rotor "Out of Round" when rotating "High" spot will cause piston to retract into caliper body
Rotor "Out of Round" when rotating "High" spot will cause piston to retract into caliper body
the piston on the rear calipers will turn in a clockwise motion and that is how they retract.
You need to turn the piston clockwise and it will slowly retract as you turn.
The piston retracts by turning it back in. You will need a Disc Brake Pad Spreader (Part Number: 648412) and a Disc Brake Piston Tool (Part Number: 648410) found at Advance Auto Parts. The Brake Piston Tool looks like a Rubik cube. Simply line up the knobs into the piston slots and place the disc brake pad spreader between the caliper and brake piston tool. Apply slight pressure on the piston via the pad spreader and turn the brake piston tool with a screw driver while continuing to apply pressure on the brake piston tool. From what I have read they could retracted by turning either clockwise or counterclockwise.