I go Brunel and I agree to some extent that there are racial segregations in the uni, but then again, theres bound to be everywhere you go. Back in my secondary and college, blacks mainly hung together and Asians mainly stuck together aswell. But that doesn't mean that they're all racist people. And I had friends from all different ethnic backgrounds.
There are no bad racial vibes in Brunel. Everyone seems to get along with eachother, as far as I can see. Also, depending on what clubs/socities you join, you can meet people from a wider range of ethnic groups.