Found the vacuum leak. missing O ring on the new M/C on the end where it seals with the booster. My mistake for not seeing that the new M/C didn't come with one on it.
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mystery disappearing brake fluid
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Randy great to see you found the issue, brakes are a good thingDano Calgary,Alberta Canada
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58HT #33317
60 HT (Sold )Comment
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John Pizzi - Squarebirds Administrator
Thunderbird Registry #36223
jopizz@squarebirds.org 856-779-9695
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Indeed it is however I am sure a booster replacement is in the future. At this point though I would like to replace that seal and not use the old one. Finding a new vacuum seal is now a difficult task. It would seem that the supplying web site as well as the manufacture do not know what a vacuum seal is. Am I telling them the wrong name for this seal?Comment
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There's a groove on the end of the master cylinder where it looks like an o ring should be but I've never actually seen one have it. Your booster should not be leaking vacuum where you need an o ring on the master cylinder to seal it. If your booster is working correctly you can leave the master cylinder off and you won't lose vacuum. I'm afraid your booster is still shot.
JohnJohn Pizzi - Squarebirds Administrator
Thunderbird Registry #36223
jopizz@squarebirds.org 856-779-9695
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from what I have read, 60 and 61 bendix brakes used a squared O ring to make a seal at this spot. Good news too, I found the part #
B8S-2493-A. My brake booster is not a clamp around type but rather screw type. Meaning screws are used to keep the two halves of the booster together. Not sure of other differences. If you would like, check out the link below. Its a bit of interesting information, I thought.
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As mentioned in the thread the seal really doesn't do much. It's more to keep moisture out of the booster than it is to keep vacuum from leaking out. There are various seals and valves inside the booster that hold the vacuum and keep it from reaching the outer case. If you have a shop manual it will have an exploded view of all the parts. It sounds like you have a Bendix booster, not a Midland booster that used the screw clamp.
JohnJohn Pizzi - Squarebirds Administrator
Thunderbird Registry #36223
jopizz@squarebirds.org 856-779-9695
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Glad to hear that it worked out. I think we all suspected that it was a booster issue from the start. You sent it to the right place to be rebuilt.
JohnJohn Pizzi - Squarebirds Administrator
Thunderbird Registry #36223
jopizz@squarebirds.org 856-779-9695
https://www.squarebirds.org/picture_gallery/TechnicalResourceLibrary/trl.htmComment
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