I'm with Fraser, Pud and Highland on this - why the hell is anyone braking hard in a bend?
All this is pretty basic driving stuff.
As for Alfas, and 159's in particular, there IS a sophisticated (no really it is) electronic stability system that will stop you making a complete arse of yourself in a bend, unless you have really overcooked it, in which case you are in the hands of Physics.
Q2e electronic (MY2008 on) and the pukka Q2 mechanical limited slip diffs are also designed to pull the car through the bend by applying power to the grippier wheel. Hurl a 159/Brera into a corner and put the power on and you can feel all this lot pull you round the corner on a tight and consistent line. Having tried it on snow in the past few days I can assure you it works on slippy surfaces too.
Any wandering on hard braking in a straight line is probably due to the effect known as tramlining - which particularly afflicts cars with significant negative camber and high castor angles - where any undulation in the road surface causes the car to vary off line. If it consistently pulls to one side, then its a braking problem and wants looking at.
Anything else like hanging the tail out or drifting aimlessly into a bend on a trailing throttle causing terminal understeer is just driving error. There I said it!
PS - if you seek excitement, brake hard from high speed on a greasy wet road, into a tight left hander when driving a To*o** A*en*s* and feel the tail wagging the dog for the next 200 metres lol - Fun!