Building brake pressure
#2
I suspect you are experincing a low vacuum issue with the brake booster. Use a vacuum gauge connected to a port on the intake manifold to verify there is sufficient vacuum when the transmission is in gear.
#4
Yes, low vacuum is the likely culprit.
-Check the line from the intake or carb to the booster.
-Verify the check valve (and its rubber grommet) in the booster is in good shape and allowing air flow in one direction only.
-The seal(boot) between the master cylinder and booster is known to fail after 40+years.
-Lastly, the booster bladder itself could be shot, Replacement or rebuild is two options if it's bad.
-Check the line from the intake or carb to the booster.
-Verify the check valve (and its rubber grommet) in the booster is in good shape and allowing air flow in one direction only.
-The seal(boot) between the master cylinder and booster is known to fail after 40+years.
-Lastly, the booster bladder itself could be shot, Replacement or rebuild is two options if it's bad.
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