What is it that makes you think the ABS has a problem?
ABS activates ONLY if the wheel rotational rate is declining so rapidly that lockup is eminent, too rapidly for road/speed conditions.
You may simply have marginal braking at the front.
from what I can figure out, the ABS controller uses this method to signal it is "unhappy" with some aspect of the performance of the ABS system. if I bring the speed of the vehicle to greater than six MPH, the ABS will signal, if you will, by triggering in the last 3 or so MPH and it will do this no matter how gentle you come to a stop, pretty much.
I can assure you that when mine is triggering, I'm not braking in any way that would be causing a wheel to lock up.