I have read that when bleeding the rear brakes, that the key needs to be in the "on" position-something to do with the a.b.s. system, and I have also read that the key does not have to be on. My problem is, I replaced both rear calipers-they were original, and I can't seem to get the brakes to bleed, so I'm driving on front brakes only. I bled tried to bleed them the 2 person method, making sure the reservoir was over full, but no luck getting them to bleed, when the brake pedal is pushed down, the rear brakes do not even move!
Searching links did not reveal any solution, so any help is greatly appreciated. Key on, or key off?

Thanks,
-DDaymen