There’s a common misconception that a tire only loses air if it’s punctured. However, that isn’t always the case. One common cause of air loss is actually a damaged tire valve stem, which is used to inflate your tires.
A damaged valve stem can be difficult to detect, but not taking care of it in time can have real consequences for both your tire and your safety.
A valve stem is a basic feature of your tire/rim that keeps your tires inflated and allows you to add or remove air as needed. The valve itself is basically a pin that is located on the outside of the tire. It plays a critical role in your tire and wheel safety.
A tire valve stem is made up of a body, core, and cap. The valve core is the inner sealing portion of the valve stem that prevents air loss. The valve core should be tightened into the valve body for a proper seal.
The valve cap is used to keep dirt and debris from getting inside and contaminating or corroding the valve core. If moisture ends up making its way inside the valve and freezes, it can cause air loss and/or a flat tire.
New tires normally come with new valve stems because the old ones will wear out over time. The valve stem could become corroded, brittle, or cracked due to a combination of moisture, sun damage, heat, road salt, chemicals, and age.
Other things that could damage your valve stem include:
- Losing the valve cap - dirt and debris may get stuck around the valve stem core, which can cause air leakage. - Improper wheel cover replacements - the valve stem can get cut by wheel covers if they’re not replaced properly. - Road hazards - rubbing against curbs or rocks can break or damage the valve stem.
Depending on the extent of the damage, the air might leak out slowly or more quickly. In both cases, the valve must be replaced.
NOTE: A leak could come from either the body of the valve, or the base of the valve, where it meets the tire.
A good initial test for valve damage is to flex the stem by pulling it to one side. If you see any cracks or punctures, or if the rubber looks really old and dry, then it’s best that you replace it.
However, a damaged valve stem can be difficult to detect, especially if you are dealing with a slow leak. Here are a few simple ways you can check for a slow tire leak:
- TPMS (Tire pressure monitoring sensor) – If your TPMS light is on, it's letting you know that one of your tires is under-inflated. If you inflate all of your tires and the TPMS goes off again after just a few days, it could be an indicator of a slow leak (if your TPMS isn’t faulty!). - Manual pressure readings – Check your tire pressure manually every week or so. If you find that one of your tires always seems to be under-inflated, you are probably dealing with a leak. - The “soap method” – Try mixing soap and water in a spray bottle and give it a good shake. Then, apply the mixture to the valve with the cap removed. If bubbles start to appear, then you have a leaky valve.
If you find that the tire valve stem isn’t the cause of your air loss, then there might be another cause at hand. Learn more about what might be causing your leaky tire.
And if you are struggling to identify the source of your leak, then it’s best you bring your car in and have a professional take a look at it.
Just because you can drive with a leaky valve stem, it doesn’t mean that you should. Driving with a slow leaking tire can be dangerous, especially at higher speeds. Your tire should be looked at by a professional as soon as you notice a leak.
Schedule an appointment today.
The average rubber tire valve should last about 4 to 5 years. However, if you see any cracks or punctures, or if the rubber looks really old and dry, then it’s best you replace your valve stems right away. Otherwise, we recommend replacing your valve stems every time you replace your tires.
We believe it’s a good idea to replace your valve stems every time you get a new set of tires. That way, you save yourself the headache of slow tire leaks. At Wonderland Tire, we want our customers to remain on top when it comes to tire performance. Let us help you with any of your tire needs!
Find us at one of our many Michigan locations or in Calumet City, IL and Rensselaer, IN. We will be sure to take good care of you and your car!
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