Quote:
Originally Posted by ErikW
They aren't vents. They are bleeders for the master cylinder.
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Not possible.
He's not complaining that the booster is sucking the fluid out of the reservoir, and the bleeder screw holes would have a direct path to the fluid in the cylinder, and from there to the reservoir. In addition, the bleeder screws wouldn't be OPEN so that they could be plugged with his fingers to stop the air leakage (hissing.)
I want photos of this hissing master cylinder.