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Reply to "Pantera Power Brake Booster"

I understand that, I suppose the answer is that my external check valve doesn't seal?

Hooked it up to a vacuum pump and it hisses away.

The can held vacuum when I tested it directly so it isn't the booster that is the problem.

Obviously I have never had this issue with any other car since this is a new one for me?

Learn something new all the time. Thanks John.
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