Not true....you looesen that bleeder 1/4 turn or more in excess of whats needed to pass brake fluid and it WILL suck air on the return stroke of the brake pedal....I know becasue it has happended to me...and I proved thats what it was....very same principle behind why you can have a air leak on a fuel line and still not leak fuel.

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Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
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Section 609 MVAC Certified
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"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche