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I just did it per the manual at 10 in 20 minutes. I didn’t check any longer than that. I can recheck and follow up.
Two additional questions regarding the leakage test
1. What you mentioned does pose a question that I was wondering. How long should the system hold pressure? I.e. I left the gauges hooked up overnight and went out in the morning and the pressure was at zero. This is over 12 hours sitting. Should it still have some pressure in the system ?
2. And when doing the leakage test on the system pressure, am I correct to assume that you use the same values mentioned above?
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1974 911 Targa
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