Yes, sound like ABS. Check the sensor to tone ring gap. This behaviour, grinding to a stop is usually a sign of misaligned or slightly damaged tone ring (few notches are bent in). As the speed decreases so the signal weakens and at the point of irregularity it will break down i.e. disappear. The ABS unit detects that as a wheel lock up and kicks in.
I had the same problem at first with my rear disc conversion as one sensor was out of place by less than 1 mm (radially) and the pickup of the signal was not good and the unit would pass self test, but as the car would slow down, some grinding would occur.
The sensor to ring gap should be 0,6 mm (0,4 to 0,8 is tolerated, but aim for 0,6 mm).
The ABS is easily checked with Forscan. There is a live speed readout function and it will tell you which wheel is in problem.