What do wear indicators on brake pads indicate?

Wear indicators on brake pads are specifically designed to alert the driver when the brake pads have reached a level of wear where they need to be replaced. These indicators typically take the form of small metal tabs or grooves that, when the pad material has worn down to a certain point, come into contact with the rotor or drum. This contact creates a squealing or scraping noise, which serves as a warning that the brake pads are nearing the end of their effective lifespan.

The primary function of these indicators is to ensure safety by prompting timely replacement of the pads before they wear down completely, which could lead to brake failure or damage to the braking system. When the wear indicator is activated, it signals that the brake pads have worn sufficiently and the driver should seek replacements to maintain optimal braking performance. This proactive maintenance helps prevent more extensive and costly repairs down the line.