The modern brake pad, caliper and disc rotor assembly have a lot of moving parts all working together to stop your vehicle. When you press your foot down on the brake pedal, a connected lever pushes a piston into the master cylinder, which is filled with hydraulic fluid.
source/image(PrtSc): Bendix Brakes
The brakes transmit the force to the tires using friction, and the tires transmit that force to the road using friction also. Today Bendix Brakes will show you how they all work together in this engineering animation.
The disc is usually made of cast iron, but may in some cases be made of composites such as reinforced carbon–carbon or ceramic matrix composites.
This is connected to the wheel and/or the axle. To slow down the wheel, friction material in the form of brake pads, mounted on the brake caliper, is forced mechanically, hydraulically, pneumatically, or electromagnetically against both sides of the disc. Friction causes the disc and attached wheel to slow or stop.