The brake pads and shoes form an important part of your car. They work together to stop your car when you press the brakes. The brake shoes are the actual device that is connected to the brake lever. When you press on the brake, the brake shoes close down on the drum of the wheel, putting pressure on it to stop. But to prevent excessive friction, the brake shoes are lined with brake pads that are made of specially resistant material. Asbestos was the material that was commonly used, but it has now been replaced with better materials that are more resistant.
For more info, see How to Change Rear Brake Shoes