My 2007 Z4M roadster brakes squeal at the end of braking or just as you are about to stop. It is always a very slow speed squeal. My dealer sanded the pads and said the pads were glazed over. He said if the squeal resurfaced to perform several hard stops and that should correct the problem. Well the problem comes back after a coulple of days. My roadster has 8k miles and this problem started about 500 miles back. The braking is not affected by this. Anybody got any ideas how to make this go away....?