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      01-29-2013, 04:21 AM   #15
AlwynMike
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Drives: F36 440i GC.
Join Date: Sep 2010
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Quote:
Originally Posted by parapaul View Post
Senors in the hubs, determine the speed of each wheel. If one wheel is different enough to the others, it will assume there's a different rolling radius and trigger a TPMS warning.

IIRC the difference in pressure has to be more than 6 or 8 psi to trigger the TPMS warning.
Yes - it uses the ABS sensors.
And the pressure drop is quite considerable before it alarms.
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