Since this game doesn't allow you to alter suspension settings or brake bias, there's really not much you can do. The only suggestions I can offer, none of which are that helpful, are:
1. Try to brake in a straight line.
2. Try a few ticks of ABS.
3. Try to brake progressively.
The 575 GTC is probably one of the 3 most difficult cars to drive in this game. It's quite a handful.