Got a question for ya guys. This past winter I was in 4WD and I was just goofing around in an empy parking lot and I slammed on my brakes and I heard a rough grinding noise. It was low pitch and the X almost seemed to bounce with the grinding noise, almost if it was catching on something. I called the dealer and they told me it was my ABS. That answer doesnt seem to sit well with me. Any suggestions?