The trick to bleeding when the system has been opened is to not pump the pedal. Open the bleeder than push down and hold the pedal close bleeder let pedal up and repeat until a flow of fluid is seen. Repeat this with every brake caliper until all are done. Top off the master and repeat but this time pumping and holding the pedal 2-3 times per wheel. When there is a lot of air in the system what generally happens when one starts the process by pumping is the fluid is pushed around the air due to the pumping process therefore trapping the air into many little bubbles. By doing it one pump at a time the air is pushed out as the fluid follows behind until the fluid pushes the majority of air out. Once the system is 95+ % fluid you then can pump the pedal to purge the rest of the air out. Another thing most will not do is when replacing a master cylinder is to bleed the master prior to connecting the lines. If the master cyl is not first bench bleed the bleeding process now becomes difficult.
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