What is an indication of worn brake pads?

Worn brake pads often lead to a grinding noise when braking, which is a clear indication that they need attention. This grinding sound occurs because the brake pads have worn down to a point where the metal backing of the pads contacts the brake rotor. This metal-to-metal contact can produce a loud grinding noise, signaling to the driver that the brake pads have degraded significantly and may lead to reduced braking effectiveness if not replaced promptly. Listening for such sounds is an important part of vehicle maintenance, as ignoring them can result in further damage to the braking system, including warping the rotors or causing other brake components to fail.

The other options do not directly relate to the condition of the brake pads. A smooth sound when braking suggests the pads may be functioning properly. Increased fuel consumption and faster acceleration are unrelated to brake condition and are more associated with the vehicle's engine performance and drivetrain. Understanding these distinctions is crucial for proper vehicle inspection and maintenance.