I just buought L G920 and i wanted to play , when i finished put the settings , the brake pedal didnt work , i should kick my foot into the pedal and i seen it works a little bit , i mean really a little , (the brake pedal has a rubber in it that should push hard) i playied ETS2 and it works perfectly , just LFS doesent work. pls help faaaast

Try setting the max and min "range" settings within the range you want to use.

dunno if a picture could help you, but take a look at my settings
maybe you just need to change "Invert", or as Scawen said, change range, i had the same issue with handbrake( as you can see in the picture, I've set different range)

I recommend using 'remove deadzones' with the g25. I used to not be able to use it because the wheel would be off centered, but now that we can manually adjust ranges, I can center the wheel while using 'remove deadzones'. My g27 feels much better with that feature.