How often should valve stems be replaced?
4 Answers
Rubber valve stems have a lifespan of 3-4 years; metal valve stems last two to three times longer than rubber ones. Additional information about valve stems is as follows: 1. Rubber valve stems: Generally, rubber valve stems last 3-4 years, similar to the lifespan of tires, so they should be replaced when changing tires. If a rubber valve stem turns dark red or the color rubs off when touched, it indicates severe aging and loss of sealing function, requiring immediate replacement. 2. Metal valve stems: To avoid the aging issues of rubber valve stems, metal valve stems have gradually appeared on the market, with steel valve stems being one of them.
As a veteran driver with ten years of experience, I've noticed that many car owners nowadays overlook this small component. Rubber valve stems may age and crack after about two years, especially for those who frequently drive long distances. It's recommended to have the mechanic check them every time you change tires. Metal valve stems can last four to five years, but you still need to be cautious about seal ring deformation and air leakage during extreme weather conditions. Once on the highway, I experienced unstable tire pressure, which turned out to be caused by a cracked seal ring on the valve stem. Checking it yourself isn't difficult—just apply soapy water around the valve stem; if bubbles appear, it's time for a replacement. This small part doesn't cost much, but the trouble it can cause when leaking is not worth the risk.
During the last maintenance, the mechanic mentioned that my valve stem rubber had hardened. Rubber valve stems typically need inspection every three years, especially in northern regions where winter temperatures drop below minus ten degrees Celsius, causing the rubber to become brittle more quickly. Metal ones can last five to six years, but the brass core that fits into the wheel rim can wear out over time. My car, which has run 80,000 kilometers, once experienced a slow leak—I noticed crystallized salt stains around the valve core during a car wash, a telltale sign of a gradual air leak. Now, I've developed a habit of twisting the valve cap when checking tire pressure; a hissing sound indicates a leak. Always replace the valve stem when getting new tires—it's a small expense that prevents big headaches.
I didn't know this before either. Once, my tire had a slow leak and it took three days to discover a crack at the base of the valve stem. The mechanic said rubber valve stems last about 3 years, while metal ones can last up to 5 years, but it depends on the environment. Those who drive by the sea need to be especially careful about salt corrosion. My colleague's off-road vehicle had its valve stem soaked in seawater for two years, and the copper core turned green. There's a simple folk method to check: pour some mineral water around the valve stem—if bubbles appear, there's a leak. Replacing a new valve stem only costs about 20-30 yuan, much cheaper than a tow truck fee. Remember to always replace the valve stem when changing tires—don't skimp on this expense.
