I'm concerned about how much pressure was applied by the pressure bleeder. If I remember correctly, they only need about 30 lbs to bleed the system. They will all spit fluid up into the reservoir, but I've never heard one whistle. Maybe the whistle is coming from the booster? I agree with knucklebuster, and nu2-72 about the cover and gasket seating squarely, and tightly.
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69 GMC K10 ..some restoration required....still..
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