Ok I just bought a new 2005 Dmax Ally 3500. When I am exiting off the highway and go to hit the breaks it sounds like a hard metal to metal rub occurs. Sometimes on a hard break at a traffic light or something of that nature i get what feels like the anti lock kicking in? Any Ideas?

At slow speeds the breaks work fine but..... It makes what sounds like a rubber bushing popping noise I know I'm way out there on this but its driving me nuts any Ideas