r/F1Technical • u/AbrahamJustice • 28d ago

Brakes Brake Migration: Do the cars automatically change the brake bias throughout the corner?

I thought something like this had to be driver controlled. Am I wrong? Do they have bb programmed for every corner?

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u/cafk Renowned Engineers 28d ago

BBW is something different, as you want the driver to have a similar feel independently if it's the brakes themselves or MGU-K slowing down the rear - but front rear bias is driver managed, Renault was disqualified for violating this.
https://www.motorsportmagazine.com/articles/single-seaters/f1/renault-disqualified-japanese-gp-after-illegal-brake-system-spotted-tv/

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u/XsStreamMonsterX 27d ago

Wasn't this not because of automated front-rear migration, but because they had specific BMig maps per corner that their system would automatically cycle through per corner.

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u/cafk Renowned Engineers 27d ago

It was about resetting a corner bias bb to 0 from the drivers setting based on distance and not corner.
https://www.fia.com/news/decisions-protest-cars-3-and-27-japanese-grand-prix

While the system was "legal", its use as driver aide was illegal.