What the heck causes a slow, swirling, rubbing noise, which sounds like its coming from the center or rear of the car (77 corvette)? The wierd thing is that if I just lightly touch the brake pedel, the noise quits. Let off the brake pedel, the noise comes back. The longer you drive, the louder and more rapid the noise becomes. We checked the brake calibers thinking maybe one was lose... no luck. Any ideas...? thanks - kip