Rear brake pads or rear brake shoes? If it is the brake shoes and you wanted to remove the brake drums, there are 2 screws on the front of the drums. To remove the screws, you need to buy the impact screw driver ($8.00). You hit the impact screw driver with a hammer which in turns loosen the screws. Then, there is another small hole with a thread on the front of the brake drum. Use the correct bolt and screw it to this hole which in turns seperates/pushes away the drum to the brake housing.
If you have 4 wheel disc brakes, you do not have brake drums.