On Fri, 23 Jan 1998 15:00:43 +0100, you wrote:

>>> This is way off topic
>>No kidding !
>
>But I did warn you, didn't I?
>

>How will the ABS system sense speed when the wheels are locked up?
>
>I'm not sure it does.
>
>And if this is correct, it is possible that the system could be fooled.
>If a person brakes in panic and the road is *very* slippery the ABS will
>start functioning. The speed is reduced and falls below the limit of
>which the ABS will deactivate (and the wheels are locked).
My understanding is that the major de-braking criterion is when ONE
wheel suddenly slows, indicating lock-up - it is unlikely that all
wheels will lock at exactly the same time. This would avoid most
problems of false detection due to normal decelerations.

On my car, if I turn very hard & brake hard at the same time (e.g.
turning into a driveway a bit too quickly), the ABS sometimes gives a
few clicks, presumably due to the difference between wheel speeds on
either side of the car due to the sharp turn.

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