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The valve will hold vacuum when engine is in a low vacuum state allowing you to have good brakes during that time. Stuck open or stuck closed would both be bad. Not saying that this is the fault. Figured it’s still something that should be checked. Must consider all options and rule out.
Love the car! Actually all your cars! Just wondering if it has a vin on the block being a 68. Also,I would have a look at the master cylinder from interior side to make sure there is no leak inside vehicle. Just a thought. Thanks for the great info and pics.