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testing used brake boosters 200 1986

posted by  darmstrong on  Mon Jan 24 18:37 CST 2005
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last visit: Sat Sep 13 12:21 CST 2014
[RELATED]

OK, so I'm talking to myself.

I called Bendix today, who FCP Groton attributes as the supplier of their brake boosters. They've sold the business (apparently to Bosch), but Jay was nice enough to field my questions. I had posed the following in my original thread:

"I've concluded from all this that the only way to get the unit to seal when it is cold, is to apply vacuum to the unit using a fairly significant force for a period of time - ie. manifold vacuum - more initial force than the vacuum pump is capable of delivering. Presumably, once this significant vacuum "primes" the seal by pulling it onto the shaft and holding it there for a period of time, it re-forms to the shaft, such that if the vacuum pump is tried shortly afterwards is able to hold vacuum."

Jay confirmed that this is indeed the case; the meagre flow offered my a hand pump is not enough to pull in the seal for a vacuum test. So I guess Bentley is misleading.

I suppose my only recourse is to either hope for the best with a used unit, or hook up a rig in the vacuum line so I can compare how quickly various units build vacuum after startup in extreme cold conditions.
--
David Armstrong - '86 240(350k km?), '93 940T(270k km), '89 240(parts source for others) near






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