rotor rubbing sound should be constant as they are bolted tight between the hub and wheel.

intermittent can only be caused if the rotor is flopping around, which means the wheel bearing is really loose.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)