"AUTO BRK FAULT" on the ECAM, means that the computer is saying, approximately, this:
"Hey! There's something wrong with the auto braking system. Or maybe there's something else wrong with the brakes that, based on the sensor data available to me, I'm interpreting as an auto brake fault. But it could, of course, be something else. Maybe there's nothing at all wrong with the brakes at all, or maybe you'll find a surprise when you land, and the brakes are either locked or nonfunctional. how should I know; I'm just a dumb computer, doing the best I can with a couple of sensor readings..."
prudence, and all that...