Recently, when I was trying to create a setup for a CTRA-GT2 restricted XRR, when the braking balance was more than 70% I always felt a rather heavy understeer when trying to lightly turn and brake at the same time. Because of that, I tried a quite low brake pressure and 55% front brake bias. I feel with that kind of setting I can control the car much more, maybe others tried this too?

I use 50% on XFG, 67% on XRG, and 75% on FBM.

Im using at all cars 58% out of formular there i make 69% and brake force is at me in the middle. so that i got much brake force but no wheel is stoping

Gretz Heiko1

Usually use around 65-68%, but it can vary depending on the track and weight distribution.

I find the brake bias needed varies depending on the suspension stiffness balance between front and rear.

You are spot on though that you need to get the brake bias correct to avoid understeer while trail braking.

You're probably trying to brake too much while turning in. If you can apply the brake smoothly and gradually, going from no brake to full brake in around 2 seconds, and have both the front and rear wheels lock at about the same time while going straight, then you're getting the most out of your brakes. If they don't lock at the same time, you're not getting the most out of them.

My teammates have known me to make some of the most quickly braking FO8 setups they've ever driven. IIRC, I used about 65-67% in that car. Even a 1% change in brake bias can have a huge effect on the balance under braking.

75% here

Quote from Forbin :

You're probably trying to brake too much while turning in. If you can apply the brake smoothly and gradually, going from no brake to full brake in around 2 seconds, and have both the front and rear wheels lock at about the same time while going straight, then you're getting the most out of your brakes. If they don't lock at the same time, you're not getting the most out of them.

My teammates have known me to make some of the most quickly braking FO8 setups they've ever driven. IIRC, I used about 65-67% in that car. Even a 1% change in brake bias can have a huge effect on the balance under braking.

+1.

Less than 60% is dangerous in a RWD, not at the beginning of a race, but when you are in the last laps, your overheated tires could easily break traction if your balance is too much to the rear.
It is a fact that you will turn less when braking+steering instead of steering. It is a concept that is hard to understand at the beginning (you usually think that because you slow down your steering radius will decrease, resulting in a better turning capability, just like I did). However, after learning a bit more about the traction circle, you will see that it is more a question of which g-forces are applied to the tires.

Tires possesses what is called a "traction circle" (which is more like an oval). It is curve (not a function), on a X & Y graph (X symbolizes the longitudinal G-force and Y the lateral) which shows the critical amount of the combination of X & Y forces (one can be 0) that a tire can hold.



As you can see on this graph, the more you brake, the less lateral acceleration a tire is able to support. (if you brake and give -0.5g of X force, you can turn more to be at the traction circle / however if you give -0.75g, you see that you can turn less to stay within the traction circle). This explains why you will always have lower abilities to turn when you brake.

Trail braking does not require a constant brake power when cornering, but as the contrary, trail braking means gradually releasing the brakes while steering at the same time. This allows the tires to help turning, while also giving a slight oversteer, always beneficial in entries.
So I would suggest you keep a brake balance between 60(FWD) and 72 (RWD depending on the type of car, weight bias, power, etc) and improve your skills, because this will mean more stability and faster times around the track

Good luck !

Oops. It appears I was mistaken. I finally checked my FO8 sets and they were 62-64%. The best of those sets was my FE4 set which used 64%.

The XRR is typically around 70%.

I prefer to use a lower percentage of front brake bias in rear wheel drive cars, and higher percentage in front wheel drive cars, since it allows me to control the brake bias under braking with the throttle to some extent.

Im usualy at 50% up to 58% i never git to 60 becuas my wheekls block the moment i push the pedal If rear wheel drive

Front wheel drive varries alot becaus somethimes my wheels tend to lock up under braking