I bought the Logitech G25 about a week ago and im very happy with it.

It works great with the pedals and H shifter in Test drive umlimited. Works ok in GRID but i just cant get it working optimal in LFS. It's like it constantly have half brake and both the brake pedal and gas pedal is a part of the brakes. I have tried a lot to solve the problem by myself in the setting menu but i cant seem to figure it out.

Have any other had the same problem, or are there possibly anyone who can help?

Cheers

Something with calibration lock..and turn off combined throttle/brake.

Make sure u select a right command/setting like

combination separate pedals

as others have hinted above, you need to seperate the throttle/brake axis,
you need to do this in LFS/Options/Controllers/axis/FF.
Aslo you need to do this in windows/Control Panel/Controllers/Properties/Settings.

Then make sure the yellow axis indicator bars in LFS axis/FF all move independantly of each other.

Goodluck

SD.