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Also note that there have been numerous reports of brake fluid in the vacuum boost canister. I have 2wo such BTV's that have brake fluid in the booster.
I have found evidence of a small amount of brake fluid on the very bottom of the vacuum cylinder - a level far too low to be sucked up through the vacuum piston. In those cases, the seal(s) had been compromised by either by dry rot or a pitted plunger rod.
However, note that there is a passage that runs from the top rear of the reservoir down to the counterbore for the seals - between the leather seal and the rubber cup seal. Was the intent to permit a small amount of excess fluid to enter the bore and keep the seals from drying out?
Yet, a failure of the compensator port valve would, upon application of the pedal, cause fluid to be pushed back into the reservoir and down that same passage. As such, I'm wondering if that could be another source of fluid found in the bottom of the vacuum cylinder.
Now as regards your latest sig line:
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Why has noone developed an atmosphereic seal for the Bendix Treadle-Vac similar to those found under the reservoir cover of nearly all cars over the last 35 years??????
I'm not sure a diaphragm-type seal could be rerofitted to the BTV reservoir cover as a replacement for the compensator port valve. Seems to me that M/Cs using such diaphragm have a heavier, formed cover that is held in place by a wire bail; I question whether all that could be easily adapted to the BTV.
Seems easier to come up with a proper replacement spring to use in conjunction with the new replacement compensator port that is provided in repro rebuild kits.
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