Have the same sound. I went to the dealer and made mistake #1 of trying to be helpful and tell them about the possibility of a rock behind the rotor.
SA returned car saying a rock fell out after the mechanic shot the rotor with compressed air. They also washed and vacuumed the car despite the trivial issue. I'm not a detail freak and my car was dirty so I was happy
A day later the noise returned...
I'm not sure if I want to go through the hassle of taking it back. New rock? Handbrake spring? Broken TPMS?
