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if you have a spare slave cylinder use the bleeder from it, that works at the larger of the two M/C lines. The smaller of the two @ the M/C takes a caliper bleeder screw....get some rubber tubing & you're in like flint.
I do believe that on the 90 abs system, unless the system is actually used the air you have can not get into the pump. During the self tests, it just works the solenoid valves to make sure they work.....I think I'm correct...
It is easier on a bench in a vise. I made a tool from an old slave cylinder push rod fitted into a small block of wood for a hdl...fits the M/C piston like a glove.
tom