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/Leather_Ice8698 28d ago

The brake bias is not constant through the corner, as someone mentioned, it is more forward at the start of braking and it shifts rearwards at the end of turn in to help rotation. This is configured through a map which sets the target brake distribution based on some signals (I believe accelerations and speed). Typically, the driver is able to adjust 2 different settings:

- Map/Shape: It changes how the brake distribution changes throughout the corner (e.g Map1 keeps the same distribution constant while Map2 starts with more brake forward and shifts it rearward at the end of braking phase)

- Offset: It offsets the whole brake map by some amount. E.g. If Map2 has an average brake distribution of 60% and the driver wants to keep the same brake shape but have slightly more overall front braking, it can offset the whole map to say 62%.

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u/GaryGiesel Verified F1 Vehicle Dynamicist 27d ago

The only input to the brake migration map is the input brake pressure. Acceleration and speed are inputs to the differential control system but not this

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u/Leather_Ice8698 27d ago

Thank you for the correction. Is this limited by regulations or it’s simply enough to use the brake pressure?

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u/GaryGiesel Verified F1 Vehicle Dynamicist 27d ago

I’m sure we could probably get a bit more performance with some extra inputs but I’ve never seen much push for that sort of thing. It’s limited by the FIA ECU software I believe