Happy Monday, so, this spine chilling screech has happened to me twice prior to yesterday. The first time was brief, maybe three or four seconds, and maybe a week after I got the car. The second time was very similar to what happened yesterday, but yesterday was by far the worst.
I had just gotten off the freeway and stopped at the light at the end of the off ramp. As soon as the car came to a complete stop I heard what sounded like a piece of sheet metal falling onto another larger and more solid piece of metal, you know, your classic sheet metal clank sound (like a heat-shield hitting the pavement). The light turns green and I start moving, and this metal-on-metal screech just fades in. I pull over, pop the hood, look under the car, look at the brakes... basically poked around for five minutes and found nothing. I had turned the car off, the last time this happened I did the same thing and when I got back in the car the sound was gone, but not this time.
At this point I decided to record the sound, so, I did (please see below video). I crawled on the shoulder for maybe another 100 ft, then stopped and turned the car off again, looked around again and nothing, got back in, turned her on, drive off like nothing had ever happened.
I stopped at my dealership this morning and spoke with the head of the service department, I showed him the video and he assured me that it was just a pebble stuck between the rotor and caliper. While I cant totally disagree, I am not totally convinced. I have had a pebble stuck in a similar fashion in other cars that I have owned, but never was it this obnoxiously loud. It literally sounds like somebody turning a piece of billet aluminum on a lathe.
Here is the video, I apologize in advance for the mild profanity. If you have a problem with profanity, then don't watch the video.