Totally lost is totally right. If u lose autobrake, say during taxi, u do the checklist, turn it off, light goes out, check the MEL and go. I dont know if u need it for cat II/III landings but if thatīs not the case, there arenīt any problems. Be ready on those brakes if u see a cow in your way during takeoff roll and thatīs it. Antiskid functions just fine.
Hope it helps,
SW.