Hi,
Yes, there is a valid reason for keeping the AUTOBRK pb depressed for a few seconds. I am unsure if recent MODS to the BSCU have rectified the Command and Monitor system on the Airbus. However, you will find your answers here:
http://www.fomento.es/NR/rdonlyres/8...1998_019_A.pdf
Cheers,
EC