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Old 05-28-2020, 04:39 AM
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Fudman Fudman is offline
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High speed rhythmic braking noise

I just picked up my "new" 2015 x3 35i and am hearing something that was not noticeable during the test drive. When braking from high speeds (40 mph+), there is a fast rhythmic, repetitive, low frequency (bass drum like) thumping sound. The rhythm decreases as I decelerate. It is not loud but it is noticeable. It is louder and the rhythm faster when braking from higher speeds (50 mph+). Below 30 mph, it is not noticeable at all. The symptoms are entirely audible. There is no pulsation in the pedal or the steering wheel. Hence, I don't think it is the rotors. Is this something related to the regenerative braking system? Possibly wheel balance? I am about to swap the wheels, front to back, to see if that has any effect. I'd appreciate any thoughts on what this is? Looks like this is something I need the dealer to fix. Other than this annoyance, I am liking the car.
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Old 05-28-2020, 04:43 AM
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Doug Huffman Doug Huffman is online now
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Perhaps improperly 'bedded' brake pad material deposited on the rotors making high / hard spots. I believe that BMW has an explicit procedure for bedding new pads. In a word, do not rest hot new pads on the rotors.
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Old 05-28-2020, 04:58 AM
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Possibly. But this car has 46K and the pads are original. I cannot imagine the original owner driving that long with this issue.
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Old 05-28-2020, 09:26 AM
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Fudman Fudman is offline
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Issue resolved. I spoke with the dealership. They said cars that sit on the lot for awhile develop rusty rotors and it takes some time for the rust to wear off. I removed all the wheels and sanded down the rust on the outside and some on the inside. The noise is considerably reduced. I suspect that it will go completely away as I drive. Phew!
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