Thats because the piston has to be turned clockwise as you press it in. There is a special rewind tool for this but maybe you'll get away with gentle pressure from a G cramp as you turn the piston with some water pump pliers.
John
August 2009
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix cars.