It is triggered by an insert in the pads that has two wires attached.
Audi a8 brake pad warning light.
Brake light may also turn on at the same time.
It warns you if there are vehicles that are getting closer or are in your blind spots.
Audi side assist blind spot monitor.
The wiring and pad is part of a ground loop that starts at the instrument cluster goes through both brake pads and to ground.
If you re like most people you probably freak the frak out when lights start flashing buzzers start buzzing or frogs rain down upon you from the firmament and freaking out certainly is a reasonable reaction to any of those changes in your otherwise benign life which typically is devoid of the unknown.
The yellow circle with two dashed lines indicates that your audi brake pads are worn.
The side assist helps you monitor the blind spots.
Audi dashboard warning lights.