Most modern automobiles are equipped with disc brakes, at least on the front wheels, because they are considered more effective at dissipating heat and moisture. The video specifically addressed the operation of disc brakes, which have many components. These brake parts have to work properly for the entire system to be effective.
One of the most important elements of a disc assembly is the rotor, which turns with the wheel and corresponding tire. The other primary element is the caliper, which itself has many elements, including pins, boots, clips, and the all-important piston.
The entire system is activated when the driver steps on the brake pedal. This sends brake fluid from the master cylinder, located within the engine compartment, to the individual brakes. The fluid activates the piston that in turn moves the calipers, which slide along the aforementioned pins. The squeezing of the rotor by the inner and outer brake pads will bring the turning wheel to a halt.
Braking systems make driving not only safe but possible. A basic understanding of brake parts and their operation will help in their use and their proper maintenance, which is another driving necessity.