I have an 08 XC90 V8 that is making a noise AFTER I release the brakes. Best I can describe is the car is making a squeal (kind of like the sound wet brakes will make when stopping, but not real loud). Its a low pitch and happens after driving for a while, so assume brakes are hot, and after I have stopped and release the brakes to accelerate. The brakes aren't siezed, I know what that sounds like. ALmost seems like air is being released and making the noise or vibration? Its a CPO and I'll have the dealer take a look, but any thoughts as to the cause would be appreciated. Thanks.