What does a brake pad do?

• A. To create friction against the brake rotor to slow down or stop the vehicle
• B. To provide lighting inside wheel well
• C. To lubricate the brake rotor
• D. To sense wheel speed

Answer: (A)

The braking action relies on friction between a pad and the rotor to slow or stop the vehicle. When you apply the brakes, hydraulic pressure pushes the caliper, which clamps the brake pads against the spinning rotor. The contact between the pad material and rotor surface converts the car’s kinetic energy into heat, creating resistance that slows the bus. Over time, pads wear down, reducing friction surface and braking effectiveness, so regular inspection and replacement are essential. The other listed ideas—lighting inside the wheel well, lubricating the rotor, or sensing wheel speed—do not provide braking and are handled by other parts of the system.