That is in my 71 service manual, but I don't know about 74. You do that if you pressure bleed from the bottom or the top, but not if you just let it gravity bleed. Seems like if it's over 35 pounds or something like that. I take a good quality squirt can with fluid in it and slowly push it up from the wheel into the master cylinder. Of course if something else is wrong this will have nothing to do with that.