As said above, there is a small star wheel adjuster that is accessed through a lug bolt hole. It is sometimes easier to take the rear wheel off first. With a flashlight, look through a lug hole and turn the brake rotor slowly until you see the adjuster. Turn the adjuster star in the direction that will move the screw out toward the brake shoe. I tighten them up until I can't move the brake rotor and back them off until the rotor turns free with a SMALL amount of drag. Make sure that when you jack up the rear of the car that the transmission is in neutral and that the emg. brake pedal is all the way returned.
To check the condition of the shoes, You need to remove the rear caliper and then slide off the brake rotor.

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My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle.