just as a note: keep in mind that trackmania doesn't support analogue inputs for acceleration/braking either way...
So if you want to use your pedals for such functionality, you're best off using something like Xpadder or similar to make that press regular buttons for you.
Then you can also configure the exact actuation point and not be stuck with 50% on/off
#Any way to configure pedals on Trackmania?
novel stratus
But generally wheel players don't use pedals in TM, they use buttons on the wheel to accelerate and brake