Mine aren't everyday drivers like most of you guys...but, keep in mind, the rotors will get a thin coat of rust on them this time of year, and back up, with this little bit of abrasive material on there will cause noise. Your aren't applying the pressure you would as if going forward...so, until the rotor is cleaned up by the pads...this could be some of the problem..but, it you have a clunk, or rattle after the first few times braking, then I would get under there and start looking....