Dear Stanley,
Without a full investigation it's difficult to be certain with ABS,
however
I believe
your problem will be an electrical one, probably caused by some corrosion
around
one of the ABS sensors (there's one on each wheel).
If the problem happens again, I'm afraid it will mean a trip to your
favourite Garage
as these things are not to be trifled with, (they're very expensive).
It will need a diagnostic unit to find out which one it is, and then some
careful
treatment to extract the unit to clean it, if it's badly corroded it with
mean a new
sensor I'm afraid.
If it doesn't show again I shouldn't worry to much, but if it does please
take the
action I've recommended, we can't take chances with your Brakes.
Regards Bill