Our last Legacy had four discs, and I'm almost certain that the rear calipers swung away the same as the fronts. The drum-in-disc parking brake does not complicate things at all - unless you have the parking brake actually
set.
As for cleaning, I use whatever I have laying around...brake cleaner, simple green, whatever. I make sure that all sliding parts are completely free of any stuck deposits - sometimes I have to use a little sandpaper or steel wool to get all the spots off. I clean the little rubber boots inside and out. I use my dremel with a wire wheel on the outer sliding parts. Then I seal it all back up with some brake caliper grease.
And even then, I've still had calipers get sticky and drag on the rotors...argh. I love Subaru cars, but that's an annoying trait, man...
Edit: The grease is important. Go to an auto parts store and get 'brake caliper grease.' It comes in little one-time-use tubes or big tubs with handy included brushes that get covered in the stuff while you store it. 'Regular old grease' will
not work - at least reliably.
Another edit: Get some nitrile gloves - the blue ones. They're
so worth it, especially when working on brakes. You can just slip them off and, viola, you have clean hands. After a brake job, that's more than a novelty.
