The way they sliders are set-up on these cars suck, I had a dragging front brake. When the caliper was compressed it would tweak and catch therefore causing drag. I ended up making brass bushings to press into the bridge, the hole that the slider goes into. That solved the problems in the front.
I have never had to take the rears apart yet, so I am not much help there. Might want to check out www.sl-i.net for more helpful info on the legacys