What does the caliper piston do during the braking process?

The caliper piston plays a crucial role in the braking process by squeezing the brake pad against the rotor, which generates the friction needed to slow down or stop the vehicle. When the brake pedal is pressed, hydraulic fluid is sent from the master cylinder to the caliper, causing the piston to extend. This movement pushes the brake pad into contact with the rotating brake rotor. The increased friction between the pad and the rotor is what ultimately slows the vehicle down. The effectiveness of braking is directly linked to the caliper piston’s ability to exert pressure on the brake pads, making this function essential for safe vehicle operation.