Fitted new Akebono pads to the rear of the Justa, and can't get the drivers side piston to retract. Passenger side went without a hitch, new pads and sensor fitted. Try as I might, I can't get the piston on the drivers side to retract. I have the tool that fits onto a 3/8 extension, and has the 2 pins to rotate the piston but no joy after about an hour of trying. Any ideas?