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Originally Posted by Penguin
> my understanding is that this system is measuring RPM differential in the wheels.
That is the old system. US law will require dirdct pressure monitoring systems in the next year or two, which is why BMW is switching to direct pressure monitors using sensors, instead of the previous differential RPM system.
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You let off the second part of that line... haha.
After looking at all of this for myself, it is pretty obvious what the system really is.
Cheers,
KEF