This fault can be triggered by a number of issues. Last time I saw it, it was due to a brake unit failure
Dan that doesn't sound right. If there is more than one fault shouldn't the system have shown a brake unit failure, being more serious than an auto brake failure?
If the message, 'Auto Brake' failure could cover other system failures, including ones that can effect the landing distance surely it is wrongly named? Something that generates a higher level of urgency, drawing attention to possible performance degradation. On the Boeings I have flown if an Auto Brake fail message came up on finals we just switched Auto Brakes to off.