I appreciate you're trying to help - but there's a bug in the game. Pressing the brake all the way in is like not pressing any of the pedals, and not pressing any of the pedals is like having the accelerator pushed in half way. I have tried re-assigningthe brake and clutch to each other as a workaround which allows me to maps the controls in TDU2 but the driving experience is rubbish. Other members at TDU2.com said they got it working by uninstalling the profiler software. Since I didn't want to do that, I just close the profiler software before I launch TDU2 which has the same effect.
With the profiler running, with the Combined pedals checkbox on or off (in a game profile and the global profiler), the game reacts the same.
Accelerator = Combined Pedals
Brake = You are already using this control for 'accelerator' (error)