I got to thinking...if there was leakage around the threads, wouldn't brake fluid be coming out around the threads instead of air getting sucked in and around? I've used a vacuum pump before as well. That will be strong enough to suck air between the tubing and the bleeder nipple, as well as around the threads. I also reverse bled this car after I reinstalled my Wilwood master (after it went back for the recall rebuild).
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