1970-1976 brake master cylinder question

louis

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My master cylinder leaks from the bottom of the threaded cap if the bars aren't dead straight, should there be an o ring at the bottom of the threads? And if so, what size and thickness is the o ring?

Thanks
 

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I think your problem is obvious.

There is a rubber bellows inside the cap I pictured. All caps need those. It keeps air/brake fluid separated.
cap 001.JPG
 
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