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We're about to look at the stroke, frankly we've NEVER looked at that. I'm confident that's where the problem is. Also, I've heard of crappy rebuilt boosters too. That may be part of the problem also but I really think something is out of adjustment on the car too.

I remember that Mars mission. We're talking about a brake booster not a Mars mission. relax. I have a EE degree and am an aircraft mechanic, I'm no rocket scientist. I diagnose a "fail" as 'unit worked then stopped working'. It "failed" to work. The reason I have troubleshot the problem to the...

I said PSI but I meant inches of mercury...PSI is just easier. I figured it was known I was talking about vacuum so it would be assumed I meant Hg". We've never messed with the linkage. That has to be the problem. Also, thank you for the explanation of how it works, it all makes sense now

We have gone through 5 brake boosters in the last year. Sometimes they'll last a few months, sometimes a few hours. Anyone else having this type of issue? We are running an external vacuum pump set at 20 psi. Could this be too much and blowing out the diaphram? Frankly, I don't know how these...