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Your sensor only reports when it's been tripped, and at that point you've got less than 1k miles left. Also, there are eight pads and only two sensors, so you could have six pads on their last legs and not know it. The iDrive mileage to the next pad change is a guess, it has no way of knowing the actual pad thickness. The only way to be sure of remaining pad life is to inspect them all, preferably yearly. 90% of squeals are caused by the pads/carriers being in need of lubrication.
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