Yes, it is a drum parking brake assembly. I know you have rear disc brakes, but the parking brake is a drum brake. Adjustments are done through the little window (covered with a ribber plug) on the back side of the backing plate near the bottom of the plate. Just like the old days. Move the star wheel up (I think) to tighten the parking brake. It may be down, but you will know soon enough.
Dave
D