A couple of days ago my wife and I were attending a fundraiser for a charity we support- held at my Mercedes-Benz dealer. On the drive over I noticed a squeal coming from the right rear wheel of my C43. I suspected a rock in the brake dust shield, but it was extremely loud. The dealer's service department closes at 6:00 pm and at 5:50 pm I pulled into the service lane. A service advisor and a tech quickly checked it over, put it on a lift and verified that it was a rock caught in the brake dust shield. Less than10 minutes later the C43 was returned in a much quieter condition. These guys are good.