Hi Josh
Check this link.
http://forums.pelicanparts.com/showt...caliper+piston
To say that mine were LOUD after the rebuild is a severe understatement! It turns out the pistons were a full 180 degrees off. With the 930 pistons they don't have to be turned 20 degrees to the edge of the caliper (should be perpendicular to the edge of the caliper), but they do have to be oriented so that the lower portion of the stepped piston is facing the incoming rotor.
To rotate them, if necessary, I would recommend blowing them out. Use a block of wood inbetween them so they don't crash into one another.