adjustment should just be like the drums... that's essentially what the parking brake for the rear discs are. remove the plug from the rotor hat, and adjust the star adjuster till its at the proper tightness. if the gen 3 rear discs are anything like the gen 5's, you won't have to worry about pushing back the self adjuster bar to undo a few clicks if its too tight like on the drums. the "clicking" for the star adjuster is simply a spring, no metal bar. see the picture below.
here's the gen 5... should be pretty similiar: