Forgot this when I did my brakes, essential?

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Yeah the brake wear indicator. The theory is when the pads wear down enough that little clip causes a high pitched squeal when you put the brakes on so you know the pads are worn. To be truthful, I’ve never been able to hear the dang things so it wouldn’t matter to me. Just have to remember to check the pads once in a while like when you rotate tires.