Well I've had Brahman and Brahman influenced cattle for years, and this is what we generally see.
If you have a cow with bad teats / udder, no matter what you breed her to (bull, we use non-Brahman bulls) the resulting female will have improved teats / udder, generally resulting in being able to stay in the herd longer. The offspring out of THIS mating will be better yet, and generally able to stay in the herd without having to be culled for those issues.
If you're breeding Brahman influence to Brahman influence, the teat / udder issue seems to be intensified.. in other words, if both parents have that issue genetically, the offspring will be REALLY bad. The problem we've had using Brahman bulls has been that it's very hard to determine their propensity to pass that trait on, and it will take a while for you to determine it if you have to wait until the heifers out of the bull are mature.
Not scientific by any stretch.. just some real life observations!