Double-T: these settings are wildly variable. They are meant to emulate the controls real racecars have that are adjusted sometimes every lap.
You must learn what they do, no one can give you a generic setting.
Aside from the fact that this game is so deranged, it has 2 independant settings for brake balance, which is entirely illegal and illogical, I can only offer the following rudimentary advice:
If you are being beaten by others, increase both brake settings, so you can brake harder and later. *without skidding* Some cars have the brakes by default so sensitive that they will instantly skid if you even look at the brake pedal. In this case reduce them.
Once you've done that:
If your rear end slips out from under you during braking, reduce the rear brake.
Both of these problems could be a sign of some other more serious suspension problem, but it doesn't sound like you care about that.
The 4wd setting I'm entirely unfamiliar with, that not being anything any racing organization seriously uses. So you're on your own there. Some cars used to allow anti-roll bar adjustments too, but not in this game.
And then there's the lovely traction control setting, which is blatantly obvious how it works, but everyone hates for some reason. Seems to be based on robots taking over the world or something...?
And I'm fighting a losing battle in pointing out that ABS is banned everywhere. Be a good boy, and just turn it off entirely. It will help you figure out the brake balance as well.
