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Under Pressure – Why tire pressure matters and how to measure it
Of all features in a vehicle, tires are one of the most important to maintain. Incorrect tire pressure can affect a vehicle’s handling, braking, ride comfort, tire life, fuel economy and the environment. This can lead to tire failure including a tire blow out or tread separation. The tire pressure monitoring system (TPMS) primary function is to make the driver aware of the state of tire pressure within the wheels. Drivers are beginning to associate the TPMS warning symbol as “tires need air,” but drivers should also regularly check the vehicle’s tire pressure to be safe on the road.
Since 2008, the TREAD Act requires all passenger vehicles in the United States to be equipped with TPMS. The TPMS primary function is to make the driver aware of the state of tire pressure within the wheels. Under normal system operations, the TPMS system will alert the driver when one or more affected tires’ pressure in pounds per square inch (PSI) falls below 25% of what is listed on the placard. When the tire sensor indicates “low tire pressure,” it sends a radio frequency (RF) signal to the electronic control unit (ECU) on the vehicle that determines if the pressure is below the threshold, which then will indicate a TPMS symbol or position-specific display, depending on the vehicle.
Having the correct tire pressure for a vehicle is crucial for safety on the road. The top three reasons why tire maintenance matters are: safety of drivers on the road, extend the life of tires, and increase fuel economy.
Pressure within a tire can change for a number of reasons including temperature changes and tire aging.
It is important for drivers to check the vehicle’s tire pressure at least once a month for best safety practices. The recommended tire pressure for a vehicle is found in the vehicle placard and in the vehicle owner’s manual. Drivers should never rely on visually inspecting a tire, always carry a tire pressure gauge in a vehicle to measure the PSI.
This article was also featured in Simplifying Service, from Babcox Media
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