when i start, i can steer like normal but my brake is stuck at 100% even though i'm not pressing it and when i go on the gas it also gets stuck at 100%. this yellow bar next to the throttle, brake, steering, etc. graph is also at 100% but i don't really know what that one means. do i have to change a setting in the config file? could this be caused by the G29 racing wheel that i also currrently have plugged in?

Hi, sorry for the late reply, I was on vacation.

Yes, stuck inputs means you have controller attached, see here: https://github.com/nothke/shakedown-docs/tree/master#inputs-are-stuck-at-50100