Always use a new rubber seal between the sensor and wheel to prevent leaks.Brass will react with the aluminum stem, and in time become impossible to remove. Always use the nickel plated valve stem inserts, never raw brass ones.The glue can and will gum things up and may stop them from working. Avoid aerosol flat tire repair sprays, even brands that say they are safe for use with TPMS sensors.If you have the more complex system with in wheel sensors and transmitters: Different brands and models of tires can vary in diameter even if they have the same size markings, so mixing and matching can give you false alarms too. Fitting one new tire to a car with three worn tires might be enough to set it off. The indirect system is fine as long as your tires are all the same size and close to the same amount of tread depth. If your vehicle has TPMS, and every new car and truck sold in America after 2007 was required to, you should take precautions to keep it functioning properly. If you do have a slow leak, the TPMS may just give you enough warning to get home or to a tire shop. Whenever the TPMS warning light comes on you should check all of your tires (the spare too, as some systems monitor that as well) at your next stop. The indirect systems are also much more prone to false alarms, which can be caused by something as simple as irregularities in the road, or worn shocks. The cheaper indirect systems can't do this. Some systems will even tell you the exact tire pressure of each tire right on the dashboard. Radio receivers near each wheel pick up the signal and tells it when a tire is low, and which tire it is. The TPMS pressure sensor inside the wheel is typically built into the valve stem. The indirect method works with the car's ABS and stability control sensors to read the speed of each wheel, and report when one is consistently faster, meaning it is low on air. The direct method involves a small battery powered pressure sensor inside the wheel, which sends out periodic radio signals when the car is moving, informing the car's computer of the air pressure. There are two different ways for a modern car to detect if a tire is low on air. Tire pressure monitor systems (TPMS) are useful, but they introduced one more thing that you have to worry about then buying tires or fixing a flat How the System Works This introduced new issues that owners of older cars didn’t have to worry about. If you have a car made in the past 10 years, computers now monitor the air pressure in your car’s tires for safety and better fuel efficiency.
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