What is the function of brake pads?

The function of brake pads is to create friction that slows down the vehicle. When the brake pedal is pressed, the brake pads are pressed against the brake rotors (in disc brake systems) or against the brake drums (in drum brake systems). This friction is essential because it converts the kinetic energy of the moving vehicle into thermal energy, which slows the wheels and, consequently, the vehicle itself. The effectiveness of brake pads in this role is crucial for safe stopping and overall vehicle control.

While smoother driving, improving fuel economy, and supporting the weight of the car are important aspects of vehicle performance, they do not pertain to the primary role of brake pads. Brake pads are specifically designed to ensure that the braking system functions effectively, thus making option B the correct answer.