Train Brake Keyboard

I can't seem to get the train brake to increase on the keyboard is there any way around this

 

The keyboard isn’t officially supported afaik so there isn’t a work around really.

 

I kind of found a way around this if you have an elite pad I have now re mapped the train brake increase button to RT and decrease train brake on RT on the shift button I find it makes it alot easily to control wsad and have the pad in one hand instead of trying to press LT and LB and work the keyboard I also feel it makes decreeing the brake way smoother instead of clicking LB