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Lot's of good reading in the "Brake" link you posted.
After reviewing the threads, it was clear it needed to be verified that the master cylinder was not leaking fluid into the booster.
1) The fluid on reservoir is not dropping. It has not moved appreciably since the brake lines and pads were replaced this summer.
2) To verify #1, the vacuum line was removed from the booster, a thin tube was inserted down the port to point near the bottom and a vacuum drawn on it the tube with a MityVac. No fluid was drawn out.
3) The Non-Return valve does hold a vacuum in the booster. But it should let air flow past it towards the vacuum pump it seems. Blew on it but could not get any air past it. Tried again and air easily went past the valve. Tried again and nothing. Could the Non-Return valve be the problem?
Next step is to build a tee fitting to place between the vacuum line and the booster to verify the condition of the Non-Return Valve.
Has anyone built one and would share the fittings needed to do this?
Thanks!
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