There is a Brake Temp EICAS message for the -400 but the checklist only involves action if in flight. On the ground, it's just a cooling off period.
Requiring the extention the flaps would seem a bit impractical considering the wide variety of scenarios where you may have to jump out in a hurry. It would take over 20 seconds of your evac time away, and there may not be hyraulics for it anyway (or any wheels, or the wing at all, or...) One would hope the slides are designed to operate correctly with the flaps up!
