If the sound seems related to when the wheels are turning, safely lift and support the rear of the vehicle and turn the wheels to see if you can recreate the noise. Then, try to hone in on the cause. Areas of concern include wheel bearings and brake pad sensors (if they are getting close to worn out). Also, although there are no grooves in the rotors, make sure there is no rust build up that could be getting lodged and rubbing the rotors when moving. One other thought is the backing plate behind the rotor. Make sure nothing is stuck between the rotor and backing plate and confirm that the backing plate is not touching the rotor due to rust issues or damage.
If you are confident that the issue is related to when the vehicle is bouncing, suspect sway bar bushings or other rubber mounted component.
Tuesday, November 7th, 2017 AT 7:06 PM