yeah, that is why I suggested checking vacuum at the booster, and if
none there, test at the vac pump with the big tube off. Vac at pump and
not at booster indicates broken tube. sometimes the crack is hard to find.
Peter Frederick via Mercedes wrote on 5/9/19 9:30 PM:
Before you replace the pump, make sure the check valves are operating and that
you have not cracked plastic section of the main vacuum line. It's pretty
brittle by now....
Peter
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