squeeling noise just when I back up... on 2000 Buick Park Avenue

squeeling noise just when I back up,sounds like it's coming from the front.

Asked by for the 2000 Buick Park Avenue
If noise goes away when apply brakes as you decide to shift to a forward gear I would say it is the brake pad squealer. Could also be build up on pads that only makes noise in reverse for some reason. I wouldn't think it is a bearing since only does it when in reverse. Hard to say without being there and hearing.