take the brake cappler off and take one brake pad and a big c-clamp and push the piston back in
now it will take a bit of force but not a lot if it is very hard to get the pistons to go back in replace the cappler
now after that Grease the slide pins on your calipers
<TABLE style="BORDER-TOP-WIDTH: 0px" class=tborder border=0 cellSpacing=1 cellPadding=6 width="100%" align=center><TBODY><TR title="Post 10960742" vAlign=top><TD class=alt2 width=125 align=center>senix</TD><TD class=alt1>Grease the slide pins on your calipers. Those pads should be right up agains't the rotor but no much that it creates a drag</TD></TR></TBODY></TABLE>