My 2007 Z4M roadster brakes squeal at the very end of a stop or just as the car stops. The dealer sanded the pads and said they were glazed over and if it happened again to brake hard a few times and that should take care of it. Well the squeal returned in a couple of days and I have done what the dealer said. That seems to stop it for a few days and then it is squeeling again. The car has 8k miles on it and this started about 500 miles ago. Anybody have any suggestion for a longer term fix?