What part of a car helps slow it down?

The part of a car that helps slow it down is the braking system, which typically includes components like brake pads, rotors, and calipers. When the driver presses the brake pedal, hydraulic pressure activates the calipers, pressing the brake pads against the rotors to create friction. This friction slows down the wheels and, consequently, the car. Additionally, anti-lock braking systems (ABS) can prevent wheel lockup during hard braking, enhancing control and safety.