Have you opened the bleeder on the caliper and used a C-clamp with the old brake pad over the piston? Is this a front brake? If this is a rear brake, the piston will turn in. See if this helps:
4. If equipped with caliper-activated parking brakes; use tool J-37617 or equivalent to rotate the piston clockwise until it retracts into the bore. Align the notches of the piston face so the centerline of the notches is perpendicular to the centerline of the mounting bosses.
Let me know what we are dealing with front or rear and what you have tried.
Tuesday, November 3rd, 2009 AT 10:24 PM