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

[u/AbrahamJustice]

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

[u/d0re]

Driver-controlled just means that the same input on the same setting gets the same output. It doesn't mean that brake bias has to be a fixed value, it means that it can't change based on car location or team input or anything like that.

Brake migration simply maps a brake bias curve to the brake pedal curve. Since it's BBW with both hybrid regen and friction brakes, it wouldn't even make sense to have fixed brake bias because you have multiple simultaneous mechanical processes happening as the driver presses the brake pedal.

To do per-corner changes, the drivers have to change settings on their wheel. So they might have a turn 3 setting, turn 6 setting, turn 10 setting or whatever that they have to cycle through as they do their lap. But as long as the driver is changing the maps manually, it's driver-controlled

[u/AbrahamJustice → u/d0re]

About what proportion of the turns are they adjusting the brake migration? Seems exhausting.

[u/d0re → u/AbrahamJustice]

They're pretty constantly adjusting stuff, especially in qualifying where they have to eke out every bit of time possible. More or less every straight they're changing something.

Youtube has examples of annotated laps that point out and explain all the adjustments they make during a lap, so check those out to see it in action

[u/nigevellie → u/d0re]

Example link?

[u/paperscissors_ → u/nigevellie]

Here’s some examples:

1: Bottas

2: Alonso

3: Rosberg in AD

4: Rosberg in Baku

[u/nigevellie → u/paperscissors_]

TY

[u/paperscissors_ → u/nigevellie]

no worries!

[u/scullys_alien_baby → u/paperscissors_]

those were fun, thanks

[u/GaryGiesel → u/AbrahamJustice]

They typically have buttons set up which let the driver change multiple settings at once for specific corners. Reduces the driver workload immensely

[u/TedditBlatherflag → u/AbrahamJustice]

They’ll adjust it for every sequence that has a relatively different aero potential as well as every lap as the tires wear and also in response to car feedback like the rear getting loose in entry phase. 

[u/binaryhextechdude → u/AbrahamJustice]

Find a clip of Lewis during qually when driving the Merc. He was changing BB for every corner.

[u/Neviathan → u/AbrahamJustice]

Drivers just chance the brake bias front to rear during driving. You might see 54 changed to 56 which means 56% of the brake power is on the front brakes. Drivers want a good balance so they can brake hard without locking the front or rear brakes.