It's not brown, just camera orangy camera flash at close range I think
Milzy, not just a pretty face are you
The answer from me is I don't know, Chazz will check on here in time and answer I suspect however I have never done or even seen the back end break off though have heard of it happening. I don't believe it is a major weak part or anything as I've seen a fair few B4 and XXX chassis in half over time.