Technically it is all brake horsepower, they've just dropped the "brake" part and just started calling it Horsepower.
http://www.sciencenet.org.uk/database/Physics/0103/p01446d.html If you notice, by the old method of calculating hp, a 2.5l Duratec V6 would be making 25 HP and 170 BHP. So the old method has pretty much been eliminated and BHP is used, though it is still called HP.
