...as I decribed and you copied and pasted in your original post. I believe it's very common for guys to empty the rear res. because they don't know how to read the level. Its tricky!

I siphon out the front res. as much as possible, which makes it easier to see the rear res. as I described. Then I put a little fluid in the front res. and bleed the rears until the rear res. is near empty. Then I fill the res. to nearly the top of the fill port, then wiggle it back and forth to get the fluid over the baffle and into the rear res. that I monitor as described.

...repeat the procedure until I've flushed through about a quart of fresh DOT 4.

Duke