Which component of a brake system prevents brake drag when the pedal is released?

The component that prevents brake drag when the pedal is released is the brake springs. When the brake pedal is pressed, the springs are compressed, allowing the brake shoes or pads to engage and create friction with the braking surface. Once the pedal is released, the brake springs return to their original positions, pulling the brake shoes or pads away from the drum or rotor. This retraction is crucial to ensure that the brakes do not remain engaged, which would cause constant friction and lead to overheating, reduced performance, and premature wear on the brake components.

In contrast, the brake caliper is primarily involved in clamping the brake pads against the rotor to create friction during braking, and the wheel cylinder is utilized in drum brake systems to push the brake shoes outward. The brake booster serves to amplify the force applied to the brake pedal, but does not directly prevent brake drag once the pedal is released. Therefore, the function of brake springs in retracting the brake components is essential to maintaining proper brake system operation and preventing unwanted drag.