I have a Mazda MPV and am hearing a noise coming from under my car after I have been driving for about 10 minutes. It sounds like a squeaky hamster wheel that needs to be oiled on one side. It seems to speed up when I am going faster, but as soon as I step down on the brake pedal, it stops completely, even if my car is still moving. As soon as I lift my foot off the brake pedal, the noise is back.
My car guy could not get the car to make the noise, but I hear it everyday. He checked the brakes and said they are fine. Any ideas?