Burgerboy

I posted on a similar Honda forum so not sure if it will be duplicated but I have an issue:
we just purchased a new Honda CR-V but when test driving it noticed a whooshing sound from from under the vehicle when braking. The sales rep said that was normal since it was new and needed to warm up but I wanted another opinion so am asking this board. Does this sound normal where a brand new car could be making bit of a whooshing noise when braking? Or could this be a normal noise for the crv? I don't recall my old accord ever doing that.