by Arthur Wagner, Kerrville, Texas
Sometimes a tire will develop a slow leak that’s hard to find. Often the leak is in the tire valve core, which is a tiny spring-loaded device inside the tire valve stem.
Frequently the leak is so gradual that it won’t immediately show up. Here is what you can do with a suspect valve stem core. Slide a small balloon over the valve stem and secure it with a rubber band. If the balloon inflates after being in place for several days, you have found your leak.
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