I've never measured the thickness but I'd say between 1/8 and 3/16ths of a inch thick on new brake shoes. Club Cars can be tricky to get the brakes working right sometimes. What I usually do is first make sure both cables are working freely. Pull the drums and clean everything up. Make sure the cables have a little slack then adjust the brakes until they just rub the drums. Then adjust the slack out of the cables.