Left Foot Bracking help !

I have an Logitech f310 gamepad , brake and acceleration is set on Z Axis(aka Triggers) . When I press both triggers , happens nothing , sure , because the only one Axis . How do I manage them (acceleration and brake) to work separately , so I could perform left foot bracking ? I ask this question because in Dirt 3 it works fin , just assigning Z Axis to Acceleration/Brake and it's strange . I tried to assign brake as button and it works , but I want on trigger . Help me please !
 
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