Summary: When putting air in car tires, make sure not to over-inflate them. Learn how to put air in car tires with the car maintenance tips in this free video on automotive repair from a professional auto mechanic.
"Dave Erb here from Dave's Ultimate Automotive, and we are going to be talking about how to fill a tire with air. First thing you want to do is get the tire valve stem in a good convenient position for you. Take the valve stem cap off, get your air source, your air chuck and just put it on the valve stem firmly and squarely, you don't want to have it cockeyed. You can definitely screw up the valve inside or not get air in it properly and you want to push in with some force in, you'll hear the air going into the tire. Sounds like a balloon blowing up. Get the proper amount in, go ahead and check it with your gage, make sure you didn't over inflate it. And you just keep adding it to where you want it. Make sure you replace the valve stem cap and avoid some slow leaks that way. And your done."
eHow Article: How to Put Air in a Tire