What does a squeaking noise when braking often indicate?

A squeaking noise when braking is commonly associated with worn brake pads. As brake pads experience wear over time, the friction material can become thin, leading to metal backing plates making contact with the brake rotor. This contact can produce a distinctive squeaking or squealing sound, signaling that the pads may need replacement to ensure effective braking performance and prevent further damage to the braking system.

Worn brake pads should be addressed promptly because failing to replace them can lead to more severe issues, such as damage to the rotors or reduced braking efficiency, potentially compromising vehicle safety. The other options do not directly relate to the specific symptoms of squeaking noises during braking, making them less relevant in this context.