So I just started tuning my own cars and I’m learning alot but the brakes I’m having a small bit getting set up. any hints or clues to what I should be looking at or what I should be doing.
right now I am working on a 99 Viper with racing brakes and the balance is at 65% to front and the pressure is 135% high
You want a little more % to the front. Front tires get the brunt of braking as the nose drives the rear has less tyres on the ground, but too much and you are not using enough of the rear to help slow the car. Also having as much to the rear as you can handle can be used to help rotate the car.
I usually put my balance to 45%(rear)
Force to 85 - 90%.
Often takes 20 meters of the 161-0 kph benchmark 
The more rearward you have this setting, the longer you can carry the brake into a turn while maintaining front steering.
This is called trailbraking, and here is a video: How to Trail Brake - What is Trail Braking and Why it's Fast
Now, the guy makes it seem overly complex, but it is just a method of braking slightly later, and holding the brake for slightly longer, while still hitting your apex(s).
This style of corner entry suits my driving style very well, so as a result I usually run a brake bias of 37%. I know this is a very common figure within the faster Forza players, and I wouldn’t mock it until you try it for yourself.
If this trailbraking style doesn’t suit you, then you move the brake bias forward until you can enter the corner with the desired amount of angle for the car. Somewhere between 46 → 48 is a good point for people who don’t employ the trailbraking style.
As for pressure, this is purely preference and up to the feeling you want in your finger when braking. I recommend running over 100% at all times, and I personally have great success with 200% pressure. Note that I have only ever used “ABS Off”, so I can’t comment on results with ABS.
So, in summary, 37% if trailbraking suits you, 46/47/48 if it does not. That’s kind of a median/average between people I know. Like anything, run whatever you find yourself comfortable with.
The only time I would run a brake bias above 50%, is on a car with a horrible, rearward weight balance. Porsche’s spring to mind here, in which case I usually run 55%.
Regards,
BM Entice.
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Regarding the brake pressure, I think it really makes a difference if you have ABS turned on or not.
I use ABS, and I think brake pressure doesn’t matter because I will never lock up.
If you don’t use it, you will lock up quicker or later depending what the BP setting is.
brakes percentage depend of the total weight distributed , generally there is more weight on the front of the car ,
so u must put more percentage at the rear in that case , otherwise u will block the wheels when the car crash on the nose when braking force ,
so for exemple if u get 51% on the forward of the car , u must put 46% or 47% on the brakes ,
after that u can adjust the pressure of the brakes :
if u put less % , u will have to press in more the trigger , and ur distance of braking will be reduced a bit with a feeling of increased braking , and u can block the wheels ,
but if u put more % , u will have to press in less the trigger , and ur distance of braking will be more long , without bloking the wheels , but extreme value can block the wheels too ,
brakes force percentage is different for all cars , u have to test it and know what is better for u ,
personnally i prefer with more pressure on the brakes , for being more reactive between 2 turns , even if the distance is more long .