According to most automotive experts, the absence of a tire cap alone is not what causes your tire to leak. This is kind of a “yes” and “no” type of question. Will Not Having a Cap on the Tire Cause It to Leak? Metal caps with a seal or rubber washer also provide a better cushion between the valve stem and the cap and do a better job of preventing the cap from falling off due to vibrations or contact with a curb. This ensures no contaminants such as dirt or ice get inside the valve and will also prevent air from escaping in the case the valve stem does develop a small leak. Some high-end tire caps made from quality hard plastic or metal come with a seal to make the valve stem airtight. The main purpose of a car tire cap is to prevent dirt, moisture, and grease from entering the inside of the Schrader valve stem, which can potentially contaminate the sealing surfaces and lead to a potential leak over time. However, you will want to find a replacement cap fairly quickly to prevent dirt, mud, ice, salt, or water from entering the valve stem and causing damage that can ultimately lead to a leak.Īvoid going several days without replacing the cap or taking a long road trip without one. Unless the tire valve is damaged or already leaking, there are no negative consequences with driving your car back home. Tire caps are tiny and easy to lose for several reasons. Imagine stopping at a gas station after your vehicle’s tire-pressure monitoring system causes a dashboard light to illuminate, indicating low tire pressure.Īs you’re about to put air into the tire, you notice that the tire cap that should be attached to the valve stem is missing. Can I Drive If I’ve Lost the Cap on a Tire?
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