from all you have given, I think the booster reservoir is NOT holding vacuum properly and what I don't understand is how you have tested this. Have you taken the large pump-to-booster line off and checked the in-line check valve by blowing/sucking on the check valve. Take care... what with all the brake fluid contamination you found. I'm betting that your check valve is not holding properly or there is a leak elsewhere. That's why I asked about the "O-ring" and "pinion" seals.
Quote:
Originally Posted by Lostyankee
If the o ring between MC and booster was faulty, then how could the booster hold vacuum when testing through the vacuum port? Can the booster diaphragm be shot and booster still hold vacuum?
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Yes, you are correct that it's very difficult to test the large capacity booster reservoir using a small hand pump. No, I don't think the booster diaphragm can be "shot" and the booster hold vacuum... I'm not sure you have proven it is receiving and holding [ or NOT holding] a vacuum. Take that large, main, vacuum line off and check out the check valve by " huff-N-puff " if you have not already done so... for it could have failed to hold or the harder to believe failed to allow air to pass and allow air to be evacuated from the booster reservoir.
Either way, if the check valve is bad, I think you will end up replacing the entire line and in-line check valve [ ~$35-45.00 ]
Sam