Is it a click/tick or a bump/thump? Can you feel it in the steering wheel or floorboard?
Does it happen when you hit a bump?
Does it happen when to turn the wheel? Which direction? If both, is sound different for L/R?
Since it's not happening at the same frequency that the wheel is rotating, I think you can rule out speed sensor or something rubbing up against wheel/tire/rotor.
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