The third sensor is most likely the vehicle speed sensor that also is used for the speedometer.
A scan tool could pick up this problem quickly by watching the data from the sensors as you are stopping.
The problem is most likely caused by loss of signal on one of the sensors when the brakes are applied. Usually this happens at slow speed. The brakes will work fine when slowing until you reach about 10 - 15 mph and then the ABS kicks in. I had that happen once on a C7500 truck. Going down hill to a stop sign and just before stopping the ABS kicked in and I went right through the intersection.
If the front sensors are adjustable make sure there is not too much air gap. Loose wheel bearings may cause this problem also. Rusted tone rings may also cause a problem but that usually shows up by turning on the ABS light starting first at higher speeds.
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Today's Featured Article - Reflections of the Fifties - by "Country" Elliott. I remember rowing up in the 1950�s in a small, rural town in northwestern New Jersey. The closest town to ours was only 3 miles away, and there were seven dairy farms in the areas of these two country towns. We had 5 acres, and because my Dad was a salesman and not a dairy farmer, he let the Bockovens, who owned the Willow Tree Dairy farm most of our land.
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