I've had this problem recently. I was getting the very fine bubbles with my vacuum bleeder. I removed the bleeders from the caliper, and put red wheel bearing grease on the threads of the bleeders liberally. I did this at each corner, and had a perfect pedal in 45 minutes. The ultra fine bubbles were coming from the bleeder screws threads. I went and purchased a new vacuum bleeder during the process, thinking I had an issue with the bleeder. Just about drove me crazy...
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