Rejecting the TO after V1 will likely end in tears, particularly if you're departing RWY27 at BRS. After V1 you'll still have control even with a two systems failed. You'll still have aileron and one roll spoiler. You'll have THS and elevator. Slats and flaps may be slow to restrict and extend although there's a good chance the takeoff config would have been maintained while the crew did their troubleshooting.
Without failures the aircraft is in normal law (all singing all dancing fancy Airbus mode) You'll extend the gear last as the aircraft will be in direct law (Cessna mode) once the gear is down. On loss of both hydraulics it'll be in alternate law (Cessna mode + a few stabilities to assist) and then direct law once gear is down. Leaving the gear until last saves pitch and trim changes, reducing workload on the pilot.
If you loose all three, not all is lost. Although not a flight law (as the side stick is out of use) if you lost all of your flight computers or all hydraulics and the RAT is unable to pressurise the blue system at all you'll be in Mechanical Backup. Not pretty (you have just your rudder, pitch trim and manual thrust), but it's an option.
Last edited by mockingjay; 4th Apr 2016 at 12:45.