I have a 2017 MS 75d with 80k miles on it. lately I have noticed a humming sound (more like a high pitch Bass) from Rear which starts at 67mph and increases up until 75mph then the road noise covers it i guess. I have extra set of wheel and tires which i did swap in the rear just to see if it was the rear wheels/tires. All four tires are fairly new. swapping did not work.
Could it be the Wheel Bearing or the DU itself? Any suggestions would be greatly Appreciated.
Could it be the Wheel Bearing or the DU itself? Any suggestions would be greatly Appreciated.
