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It certainly sounds as if you still have air trapped in one or several calipers.
One useful trick I've used is to isolate the calipers from the MC. You do this by gently squeezing shut the flex lines to all the calipers using C-clamps -- six required (two in the rear). Be very carefull to squeeze only enough to shut off the flow. Don't clamp so tight that you crush the hose.
When you've squeezed shut all the flex lines, then the pedal should be high and hard. If not, then either the MC is defective or you have air in it or in the lines.
If the pedal is hard, then remove one C-clamp, permitting brake fluid into one section of one caliper. Test it for a firm pedal, and bleed it 'til firm. Then remove the next C-clamp, bleed that caliper, etc., etc.
This way you can isolate your focus to only one caliper (or one half a caliper in front) at a time and assure yourself that it's free of air.
If you find you have air in the MC or lines, it's best to bleed it through one caliper. (Incidentally, you can "bench bleed" a MC so successfully prior to installation that you never need to crack a bleeder.)
--
Don Foster (near Cape Cod, MA)
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