Originally Posted by jasonbi
the only thing to add to this would be to line up the notch on the lower back portion of the pad with the triangular opening on the caliper piston.....if not the pad might not sit flat on the rotor.
Just did the rears on my car this weekend. I missed jasonbi's earlier comment to align the piston so that one of the notches in it line up with the tab on the back side of the brake pad. I did not get the piston retracted so far into the caliper that the caliper could position down far enough to put the bolts back in. I had to fiddle with the rotation on the pistons on both sides to get one of the slots to align properly with the pin on the backside of the brake pad. Even then there was only enough room to just get the caliper back into position.
I spent an extra 2-3 hours total between the two sides to get these back on properly, even after figuring it out on the first one.
Also be sure to put pressure on the piston as you rotate it or it will not compress.