Shida, here are screenshots of what my [CH PRO PEDALS USB properties-Test tab] look like when I depress the left pedal.

You need to solve the problem in windows before you deal with any AH input issues. If yours don't look like this, then try the following:
A. Run the calibration (sure you've already tried this).
B. Remove the Device
1. Go into device manager and REMOVE the device
2. Unplug the USB Pedals
3. Reboot your computer
4. Plug in your Pedals and test again.
C. Manual test of POT
1. Take the Pedals apart
2. Locate and find the POT for the left or right brake (be very careful taking apart, and remember where everything goes, and the guides for wires, etc).
3. Take the POT out of its mount, and twist it manually
4. While twisting, watch the test Tab to see if you have full range of motion. If you do, then make sure the mount is working properly.
5. When putting it back together, make sure all the wires are in the right guides, and do not over-tighten the screws on the back as it can restrict the movement of the Z axis freely.
Good Luck!