For me, the trick was the pedal master cylinder. forget what the instructions say. I know the o ring on the bottom of the sleeve is supposed to seal off the outer section with the window, but this worked for me. put a rag on the floor below the mc. remove the sleeve, fill the mc. now insert the sleeve so there is no air on either side of the sleeve. make sure there is no air in the mc reservior and fluid is pouring out the top and sides as you screw in the sleeve. now fasten the lines and back bleed to fill the handlebar mc. try that