Multi touch not working - What's wrong with this code?

Hi there,

I'm trying to get the Android/iOS controls up and running for my racing game, now that the desktop version is complete... I'm having issues with the multi-touch. For some reason, when I try steering, it stops accelerating until I release the steering button again. Probably something simple, I'm new to this touch stuff... any ideas?

EDIT: New code - multi-touch working but buggy - bools stay activated etc, so car tends to all of a sudden veer off the road or stop accelerating.

 function OnGUI()
 {
     for (var i = 0; i < Input.touchCount; ++i) 
     {
         if (Input.GetTouch(i).phase != TouchPhase.Ended && Input.GetTouch(i).phase != TouchPhase.Canceled)
         {
             if (GasButton.HitTest(Input.GetTouch(i).position))
             {
                 bGasButtonPressed = true;
             }
             
             if (TurnLeft.HitTest(Input.GetTouch(i).position))
             {
                 bLeftButtonPressed = true;
             }
             
             if (TurnRight.HitTest(Input.GetTouch(i).position))
             {
                 bRightButtonPressed = true;
             }
         }
         else
         {
             bGasButtonPressed = false;
             bLeftButtonPressed = false; 
             bRightButtonPressed = false;
         }
     }
 }