Brake bias: understanding and adjusting brake balance

Brake bias is one of the settings I can adjust directly from the wheel, sometimes even when the rest of the setup is fixed. In this guide, I explain how to read it and use it to make corner entry more stable or more agile. The aim is to find a balance I can control, then adapt it to different situations.

Understanding what the percentage represents

Brake bias distributes braking effort between front and rear. In the display explained here, the percentage corresponds to the front share: 52% therefore means 52% at the front and 48% at the rear. Increasing the value moves the balance forwards; reducing it moves the balance rearwards.

The number alone does not establish whether a car is easy to drive. A value above 50% does not automatically mean stability, and the appropriate setting varies with the car, setup and conditions. I mainly consider the effect of a small change from my starting point.

Assigning controls and reading the value

I begin in the game menu by assigning one command to increase bias and another to reduce it. A rotary encoder on the wheel suits me because it is easy to reach. Two buttons can serve the same purpose.

The current value also needs to be visible on the dashboard, an external display or a simulator window. In the video’s iRacing example, I use the relevant black box. This avoids adjusting blindly and helps restore a reference after trying another balance.

Adding stability under braking

By moving the balance forwards, I try to calm a rear end that is too nervous on entry. The potential trade-off is a car less willing to turn. This does not replace brake or steering modulation; it helps restore a margin when I lack confidence.

I use Pouhon at Spa as an example of a fast, demanding entry. In the situation shown, adding some front brake bias makes the approach less risky for me. It may mean accepting a slightly lower speed, but a more predictable car can improve consistency throughout a race.

I also use this margin when tyres, track conditions or concentration change. The most aggressive setting is not always preferable: if I spend the lap fearing a loss of the rear, I am not using the car effectively.

Seeking more rotation

Conversely, when the car refuses to rotate under braking and takes me away from apexes, I can move bias slightly rearwards. I seek greater entry agility while accepting reduced stability.

The video also shows the limit of this approach: I lose control at Pouhon with a more aggressive setting. For heavy braking followed by a tight corner, such as Monza’s first turn, I explore this adjustment to balance braking and rotation better. Any gain depends on maintaining progressive inputs and controlling the car. I can then return to a more neutral value for the rest of the lap.

Adjusting without losing reference points

The opening laps on cold tyres may require a different balance. I observe actual behaviour: a car pushing at the front does not necessarily need the same correction as an unstable rear. Without ABS, wheel lockups also provide useful information about which end is being asked to do too much.

In my Porsche GT3 example, I usually explore a range close to the initial setting, around one or two percentage points in either direction. This describes my approach in the demonstration rather than a universal value to copy across all cars.

Finally, brake bias acts while I brake. It therefore influences entry, line and access to the apex, but does not directly correct a phase when I am no longer touching the brake. I keep changes modest, easy to understand and repeat, before considering adjustments at several places around the circuit.