[mavrick0]

Have you calibrated the ESC to the radio? Stick in center/neutral and then go through the setup procedure in the ESC instructions? If you have then keep in mind this ESC has a double pump reverse setup. Which means after going forwards when you go to reverse the first time it is a brake only. You then need to go back to neutral and then go into reverse for the reverse to work. But you can not go into forward at all or that sets the ESC to then brake again.