How to adjust the Electric Braking option?

[Bastl1989]

Variant

USART

Control type

FOC

Control mode

Torque

Description

Hello,
I am still improving Marie's GClass :) and I have to say: It is working great!
Background:
I control the torque request input by arduino.
To limit her Top-Speed I limit my "Driver Request" over measured speed.
When she releases the throttle, or drives downwards and car gets too fast, I want the car to brake, using the Electric Brake option provided.
But I do not fully understand how it works or where I can/should adjust. (Where can I find the code behind this function?)
I put in a number of 400 for maximum braking. but how can I fade this torque in? I want to increase breaking torque slowly to avoid controller oszillation.
Real question: :)
I thought about just sending negative torque while going forward to brake the car but that seems not wo work? right?
Does anyone know how to do this?
Thank you guys!
Sebastian