The above poster is correct. Inside each rear brake rotor is a small set of drum brake shoes. Remove rear wheels, rotate rotor till you see the small star wheel adjuster thru one of the lug stud holes. Rotate adjuster with screw driver till shoes drag on drum then back off a couple of clicks, NEVER adjust the park brake cables.

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81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.