all hydraulic lines hate air bubbles

some of the bubbles go up (to the master and it's fluid tank), some of them can't go up because they are trapped in different line bendings etc. So your main objective is to get rid of the air that can't go up. To do so, put one end of a rubber hose on the bleed screw, submerge another end in breack fluid. This will prevent air from "outside" getting back into the line. Then unsrew the bleeder, and start working on the brake pedal checking fluid level in master's container constantly untill the air stops coming from the submerged hose. Then tighten the bleeder. Do same for another wheel. After that check your brakes. Be carefull. I know this is not how things are described in books, but when there's noone to help and you need the car fast - this trick works fine. Did it three times on two different cars. But if you are not well experienced to determine whether the brakes are working OK or not, don't do it

)