Brakes question. So im trying to refill my brake lines after putting new ones on,and im using a mighty vac its a hand pump brake bleeder kit. Now from what ive seen in videos when there is no more air in the line i should have a tube with no bubbles so a straight line full of brake fluid coming off the bleed stem, but no matter how much I pump I cannot maintain pressure, and the line from the bleed stem to the reservoir never even comes close to filling up, and its frothy from lots of air. My question is am I opening up the bleed stem too much? ive tightened every connection down I even bought the proper sockets to do so, and my sealing washers and banjo bolts are all brand new with the lines. Also plenty of fluid in the top I just cannot get this right. Any help would be greatly appreciated.