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Interesting... I thought the bottom bleeder screw was there simply there to help purge accumulated crud out of the caliper when pressure flushing & bleeding. Given the way this caliper is designed and oriented on the car, you can see there's a low point that would tend to trap & accumulate crud, so I figured the extra bleeder was there to deal with it.
Whenever I flush & bleed brakes on the FC, for the rears I open the bottom screw first (top closed) to flush out the crud. When fluid flows out clear & clean from there, I close the bottom screw & open the top one to purge the air out.
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