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Home > TPMS News > DIRECT VS. INDIRECT TPMS

Direct Systems attach a pressure sensor/transmitter to the vehicle's wheel inside the tire's air chamber. An in-car receiver warns the driver instantly if the pressure in any one tire falls below a pre-determined level. Indirect Systems use the vehicle's antilock braking system's wheel speed sensors to compare the rotational speed of one tire vs. the others. If one tire is low on pressure, it will roll at a different number of revolutions per mile than the other three tires, and alert the vehicle's onboard computer.

Ford TPMS