to remove the drum take the emergency brake off then use 2 bolts of the right thread in the 2 holes. as you tighten them it will force the drum off the hub until you can remove it by hand. once you get it off you can inspect the shoes and drum and see what needs replacing. also check wheel cyl and make sure its not leaking. if the springs look rusty i would recomend getting a drum brake hardware kit for your car, its only about $10 for both sides usually. when you start removing the springs and clips only do one side of the car at a time, that way if you forget where something goes you can look at the other side