The ABS system does not operate by detecting the speed of car's wheels. I
detects the  deceleration rate. If the deceleration of the wheels is too
high, it sends signal to release the breaks.


-Sunthiti Patchararungruang

On Fri, 23 Jan 1998, Oyvind Kaurstad wrote:

> This system have sensors on the wheels that senses whether
> it is rotating or not. Usually it is sensing on a toothed disk of
> some kind. (Probably some kind of hall-effect gadget)
>
> This is perfectly suited to sense if there is rotation or not.
>
> But here comes the interesting part:
>
> How can a car with ABS brakes come to a stop in a hill?
>
> Why don't the ABS-system release the brakes when the car stops?
>
> And now you might say that the ABS-system is deactivated below
> a certain speed, which is absolutely correct.
>
> But what if a car standing still starts to slide? Will the ABS-system
> be able to release the brakes?
>
> Just wondering....
>
>
> -Oyvind
>