Problem with game

Hello. I have problem with my game. I bought custom handbrake. It is ardunio micro if that is important. Handbrake is working but even on 3th gear the car won’t drive. The RPM are max just like when i use clutch. When I disconnect the handbrake everything is back to normal. Anyone can help me? I can’t drive with handbrake plugged into pc.

PS. Sorry for my bad english.

Problem solved.