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Wear sensors tell the driver it’s time to either investigate or replace the brake pads. Back in the day, brake pad wear was usually accompanied by high-pitched squealing whenever the driver pushed the brake pedal down. Most modern wear sensors have two circuits running in parallel. The first electrical conductor triggers a fault when the resistive circuit contacts the surface of the brake rotor face thereby cocking the fault matrix. A secondary fault occurs when its circuit is tripped by breaking its circuit entirely, followed by an alert on the instrument cluster. The entire electrical sequence is typically referred to as a two-stage wear sensor process.
If the indicator light appears, it's time for a new set of pads. If you have trouble with the indicator light itself, it may be an electrical issue. There's no maintenance, but a repair or replacement part may be necessary.