A TPMS or “Tire Pressure Monitoring System” electronically monitors the air pressure inside your tires. Depending on your vehicle, the TPMS reports the tire-pressure information, through a gauge, a pictogram display, or a low-pressure warning light. This system can be divided into two different types—direct (dTPMS) and indirect (iTPMS). As of September 1, 2007, the TREAD (Transportation Recall Enhanced Accountability and Documentation) Act requires that all vehicles sold in the U.S. be equipped with one of these types.
reports tire pressure in real-time through pressure sensors installed directly in the valve of each tire.
uses the car’s anti-lock braking systems (ABS) to approximate tire pressure. Since tire inflation levels affect tire rotation, indirect TPMS also relies on the differences in wheel rotation to detect under-inflation.
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