- You can use a deflator, which is a small, cylindrical object with a plunger on one end. Place the deflator into the opening of the valve and push down on the plunger to release the air from the tire. - You can also remove the valve stem cap and let the air escape by itself. Be sure to replace the valve stem cap when you're done. - If you have a tire pump, you can press down on the valve head until you hear air escaping from the tire. This will deflate your tire. Make sure the black rubber gasket is in place before pushing down on the valve.