My wifes 06 torrent has a brake squeal I can not get rid of. I've replaced rotors and went with a good quality pad and cleaned and greased the caliper slides and still a nasty brake squeal when slowing down. This car has done this from 30,000 miles and it now has 60,000. I have tried different sets of new rotors and pads with no luck. Anyone have any ideas? Thanks.