The use of a brake system is to either slow down or stop a moving vehicle. It does this work using friction. In modern cars, the brake system has several components that work together so that you can stop or slow down the vehicle when required. These components include a master cylinder, hoses, brake pads, brake shoes, drums, etc.
The latest cars make use of a hydraulic braking system having brakes on all four wheels. However, the brakes used can be disk type or drum type.