This is a rubber bumper or buffer that is located in the aluminum frame that holds the brake/clutch pedal assembly for all Vanagon. The brake pedal or clutch pedal arm rests against this rubber stop when they are in the resting position. So if you hear a noise when your pedal comes all the way back up to the top, then this rubber stop is probably missing. You can feel with your hand up behind the aluminum frame to feel if the stop is still there or not. If you feel just metal, then it is gone.