Thread: flat tire..no low pressure light!!
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Old 11-07-2007, 02:05 PM   #5
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Quote:
Originally Posted by misslindseysue View Post
The TPMS is ABS based. It takes some driving to set it so it can see a difference in the wheel speed = rolling diameter. So if you had a flat when you got in the car, it wouldn't have set right away - not until you drove a few miles at a fairly consistent speed.
Active TPMS (which is now required on new cars) would have told you that you have a flat right away, but that requires (expensive) sensors in each tire.


MissLindsey is right again...

THere is direct and indirect tire pressure monitors. Unfortunately you will have indirect which calculates wheel speed differences of 12 psi or more. Direct actually has a sensor on the wheel that is pressure sensitive.
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