You have a point on the down elev! I never use that so didn't even consider it. Most of the gear now lock overcenter when up or down, but you could wait until final to drop the gear. Again, if you have a leak in the upside in flight, as long as you leave the valve in down it should not port air back out the same leak. Anyway, I will give it a try. Don't know why I didn't think of it a long time ago. On the B-52 we had a shuttle valve that would switch hyd pressure from another system if you lost primary hyd to lower gear. Same idea, just using the brake system. Not perfect, but very simple. Bob