Thread: 1985 300TD strange brake behavior
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Old 03-15-2016, 10:48 AM
toomany MBZ's Avatar
toomany MBZ toomany MBZ is offline
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There is a check valve between the pump and line going to the poster.

First however, you need to determine how much vac is being produced. Connect a vacuum gauge to one of the orificies with the other blocked off, then check the other. You should get ~22 inHg on one and ~15inHg on the other.
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