Hetfeild
Any chance you could give the airbus type so a manual or notes can be consulted to give you an answer.
Seeing pressure on the triple indicator means for some reason the alternate brake system was doing the braking. Not the primary.
At the time I may have suggested bring the aircraft to a stop parking the brakes and selecting the Antiskid/ NWS off then on(cycling the BSCU) probably would have been a useful thing to do from a trouble shooting stand point and may have solved the problem. Being towed back to blox seems extreme but I was not there, So now its history..