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So, does 500 psi seem OK, or low for line pressure? If it's low, any ideas what could be wrong?
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Argess,
I agree with Ed's answer - it seems your brake line pressure is below "standard." Here's a typical article on pressure:
https://info.mpbrakes.com/faqs
If you DuckDuckGo brake line pressure this is kinda typical of the result.
It appears 750-1000 psi is a much more common number for brake line pressure. A bit higher for panic stops.
Measuring your present master cylinder's actual diameter seems like a good place to start.
Tom