With the piston in the master cylinder still backed up by the plunger it won't blow out- again low PSI.
Here's a pic of the vac bleeder or suction rig. It works like a champ both ways, when blowing I had to tape the vac hose down. Best used when bleeding by yourself on stubborn calipers with trash in them to pull dirt out & when I want to extract old/bad brake fluid.
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