Seems to me when I installed the rear brake kit I was having this prob too. I think I pulled the MC off 3 or 4 times to bench bleed. What finally did the trick was how I ended up bleeding the lines. Since my wife always gives so much flak about sitting in the car and pushing the pedal(tough job) I decided to give it a go by myself. I opened the farthest away bleeder first and with a hose in a bottle of fluid set higher than the screw I pushed fluid through with a couple of slow strokes and a couple of quick short pumps(not all the way down) and a couple more slow till the MC was almost out. Don't let the fluid run out. Did one at a time till they were all done. Worked like a charm. I figure I probably changed out all the fluid in the system with new by the time I was done and didn't have to put up with all that ""are we done yet" BS.
