How do I get the piston on the rear brakes of my 2004 407 to move?? They wont go back in so I can replace the pads

Tom Govan, July 2008

They have to be rotated using special wind back tool[availiable from good motor factors]ONLY do this onced the hbrake cble has been slackend off,and the caliper lever has been pulled to off position.once pads in,manually operate caliper lever to advance piston/pads to clamp disc.ONLY THEN,refit hbrake cble and adjust free play.Failure to do this will result in poor/nonexistant handbrake,and eventual caliper failure.

caine, July 2008