Ok. My brakes in my 97 Suburban feel like they are grinding. I first thought the pads went out and checked to see if there was pad left and not grinding the rivits. They grind only coming to a stop. I got 3/8" of pad left. I looked at other causes and my theory is the wheel baring need re-greasing. I live off a dirt road and during the winter it gets real muddy. I heard that conditions like that can dry out the lubrication. Is my theory correct or does anyone else think its something else?