I'm getting an odd sound while driving, and my guess is that it's from the passenger rear. It's a rotating sound, like what you'd get as a kid when you attached playing cards to the spokes of your bicycle. The tone is similar to the metallic crack & pop you get when the car is hot and you shut the engine off. I can really hear it when driving past parked cars, as the sound seems to ricochet. Since the sound is rotating, I'm wondering if it is wheel or brake related. Any thoughts?