I hope I get this right! in the front bay drivers side, follow the large yellow air hose that runs from the parking brake in the cab to a small unit in the lower right part of the bay. You will see two small wires running to this sensor unit. look close and you will see that the wire terminate at what looks like a plug small with a small screw in the end. Just unscrew this and then just pull out and it will unplug, instantly your parking brake will pop up and you can be under way. A word of caution try to look and see if your slide pins are in or partially in before you take off, mine looked like they were in I checked this before I unplugged. Hope this helps, you can't go any where when that parking brake won't release! Gary