I was driving back home and noticed that while I was approaching a red light, and began slowing down that this horrible moaning sound was coming out from the front end wheel area of my '01 4x4. When the light turned green i let my foot off the brake and the moaning began again and continued until I picked up some speed. Does anyone know what this noise might be? It is a horrible sound and it sounds like my truck is in pain. LOL PLEASE HELP!!!