Do you need a special tool to push the rear caliper piston back in on 2009 grand caravan?

Yes, you will need a special tool to push the rear caliper piston back in on a 2009 Grand Caravan. The tool is called a caliper rewind tool, and it can be purchased at any auto parts store for a relatively low cost. The tool is used to apply even pressure to the caliper piston, which allows it to be pushed back into the caliper bore. This is necessary to replace the brake pads or rotors on the rear wheels of the Grand Caravan.