Cruising about 75mph on my 08 FLHP 2up, I thought I heard air released for 2 seconds but no other indication. I thought... what if I had a blow out and how would I slow down from that speed not knowing if it's the front or back? At that point it was just a thought but I slowly started making my way to the side of the road, not touching the brakes at all. Soon as I got down to about 35mph the front started tank slapping. I knew I had no air in the front tire. I came to a stop safely and noticed my air valve was missing but the tire was fine. I had put a little air pressure indicator on it that shows red if the pressure drops bellow 32lbs. That pulled and stretched the rubber valve which caught on the brake caliper and ripped it off. I think I was very lucky to make it and probably having the Dunlops that come on the Police bike helped.