I had actually bled the fluid from all lines 6 months ago and am doing the front ones now, since those are new brakes. I wasn't intending to flush the rear again, since the fluid should still be quite fresh (and you are supposed to start with the rear, right?). The front lines will be empty b/c of the new caliper and new brake lines. I will definitely check the brakes before I leave to make sure they are working well.

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dannyf
1984 Mercedes 300 SD 214 K miles. Runs on WVO ~ 22 mpg over 8 K on WVO
1997 VW Passat TDI 156 K miles. Uses biodiesel and diesel. ~ 41 mpg
1996 Mercury Villager gasser. ~ 20 mpg