Thanks, Jetjock. On the ground, I know Autobrake logic won't allow the switch to be set if the brakes are parked (as there is pressure in the "metered" brake lines). In the air, with the landing gear lever in OFF, is all hydraulics removed from the landing gear, or just from the retraction/extension system? I originally believed all gear systems, but looking at the brake hydraulic schematics, unless I've overlooked something, I don't see how this can be true.