Got a brand-new 2010 Expedition. Great truck! Only problem is an occasional tapping sound when going over bumps. Something is loose but after 20 tries I can't figure it out. I did find a small black spacer thing on the drivers floorboard right after I got the truck. It appears now to have come from the parking brake "cam" that is located to the left of the brake pedal. It doesn't fit perfectly but when inserted the noise appears to stop? Any one else with some insight on this? I put it in but it popped back out after just a little bit. Thanks as always!