Gud day all....after washing my car I did not drive my unit for about a week. Then today after warming it up, I put the tranny in reverse and the car wont move (headshake ...then I put it back to park then to reverse position but still wont move, so I pressed the accelerator and I heard a thug and I thought I just run over something so I went down check the garage but there's none. I drove it forward and then to reverse and everything was normal. I wonder what could have caused the thug..could it be that the break pads got stuck coz it wasn't use for a week???