Built-in Tire Pressure Sensors
Many modern cars now come with built-in tire pressure sensors that allow all four tire pressures to be read simultaneously from inside the car. In 2005, most on-board TPMS used indirect pressure monitoring. The anti-lock brake sensors detect one tire rotating faster than the rest and indicate a low tire pressure to the driver. The problem with this method was that if tires all lost the same pressure then none would show up against the others to indicate a problem.
Read more about this topic: Tire-pressure Gauge
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