Where is the leak? Is it where the rubber stem penetrates the steel wheel? Or is it around the valve core? If it is where the stem comes out of the wheel, I don't know anything to do about it. If it is around the valve core, there are a couple things to try.
1. Depress the valve firmly and let a big whoosh of air escape. This may blow out a little piece of grit, which will let the valve seal.
2. Tighten the valve core, in case it is a bit loose. There are special valve core wrenches, but the easiest thing is to replace the valve caps with caps that have a built-in wrench. The "wrench" is actually a slotted "tower" on top of the valve cap. A pair costs about a buck at Wal Mart.
3. Replace the valve core - unscrew the old one, throw it away, and screw in a new one. Again, about a buck at Wal Mart. Of course you will do this when you are parked beside an air hose, since you will likely lose a lot of air while you do it.
Bill
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