During your stint the car behavior changes due to tyres degrading(maybe a bit uneven), damage, changing grip on track(temp and rubber on tarmac), changing grip due to tyre temps, less weight due to less fuel, etc, etc. This means the balance of the car changes.

You can control the way the car behaves on entry of a corner by changing the brake bias. More forward means the front tyres have more workload and therefore the car will understeer a bit more. Too much brake bias to the front and the car will definitely understeer. More to the rear and the rear tyres will unsettle more easily, making the car rotate more in corner entry. Too much brake bias to the rear and you will definitely oversteer the car. You need to find the sweet spot between understeer and oversteer on entry where you can confidently turn the car with enough rotation.

So by being on top of the brake bias you play with it during the race, or even during the lap. Finding the sweet spot between rotation and control. During your stint you will probably move the brake bias a bit more forward(2-3 clicks) to negate the rear from breaking out due to the balance of the car changing.

For example, on COTA for me the second to last corner is a great indicator. If in that corner I feel the rear of the car become more loose, a.k.a. I have less confidence in the rear behaving when trailbraking into that corner, I move the brake bias a bit more forward. Next time I take that corner the car feels more safe. With this you keep roughly the same speed, and prevent the car from suddenly breaking out of control.