I don't know but I alway thought ABS = Anti-lock brake system, where the 
relative motion of each wheel/axle was sensed, analyzed, and if a wheel 
had significant less speed than the remaining (other?) wheels, it's 
brake was applied, and without getting into a lot more detail. And yes 
there are many different systems and how they react out there. Generally 
there is a sensor at each wheel consisting of a slotted rotating disc, 
and a hall effect sensor. The 1996 Bronco, and that's early in the ABS 
evolution has sensors on each front wheel, but only one on the rear 
differential ring gear. Now we a getting into the turf of knowing your 
vehicle and how it functions.

Gerhard Fiedler wrote:
> Funny NYPD wrote:
>
>   
>> this is not surprise at all. GM canceled the ABS as a standard equipment
>> on all its America models couple of years ago, because  of the poor
>> performance and constant issue it created. 
>>     
>
> ABS may not be (and probably isn't) ABS. This seems to be a rather tricky
> control feature, and I'm sure there are big differences between different
> ABS manufacturers.
>
> Gerhard
>
>   
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