What are the essential components included in disc brakes?

Disc brakes are a vital component of modern vehicle braking systems, and understanding their essential components is crucial for assessing their functionality and maintenance. The correct answer highlights that rotors, calipers, and pads work together to create effective braking.

Rotors are the large metal discs that are attached to the wheel. When the brake system is engaged, the calipers squeeze the brake pads against the rotors. The friction generated here is what slows down or stops the vehicle. Calipers house the brake pads and contain a piston that pushes the pads into the rotor, providing the necessary force for braking. The brake pads are made of friction material and are the components that directly press against the rotor; they wear down over time due to this contact.

The answer indicates a clear understanding of the role each of these components plays in the braking system, which is essential for troubleshooting and maintenance. While drums are mentioned in other braking systems, they do not pertain to disc brakes specifically, which is why they aren't part of the correct answer.