Proper vacuum gauge readings - Mercedes-Benz Forum

 
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post #1 of 1 (permalink) Old 04-11-2009, 07:32 AM Thread Starter
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Date registered: Apr 2009
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Proper vacuum gauge readings

I have an '84 300td that shifts with a "thump" when I come to a stop so I replaced the vacuum connections and worn levers on the 3 way vacuum fitting. The problem still exists. With the engine running the vacuum gauge from the supply lines gives me a reading of 20-22. The reading I get from the supply side that connects to the green dashpot is zero. That makes no sense to me when I get a reading from all the other connectors. Why am I not getting a reading that feeds to the dashpot? Would this be why the car shifts so hard?
I'm a newbie to vacuum testing.
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