Arduino, using handbrake

Hi guys,
I have problem with the axle of a handbrake, I am using the arduino board, however, I bought and do not understand very well.
In the "game controllers" tab the handbrake axle is the same as my accelerator, I use logitech g920 with accelerator and handbrake.
I am brazilian but i am using google translator, sorry for the errors.

printscreen

thanks.

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