300D vacuum pump - Mercedes Forum - Mercedes Benz Enthusiast Forums


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Old 02-22-2009, 11:24 AM
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Default 300D vacuum pump

i was driving my 78 300D from salt lake city to LA and when i got to St. Gorge ut i noticed my breaks were hard to push and when i stopped for fuel i had to turn off the engine by pushing backward on the throttle. i have no vacuum at all.
what is or are the most common failures of the vacuum pump?
im thinking its the diaphragm.
also does anyone know a place in LA where i could get the parts i need on a sunday
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Old 02-22-2009, 02:18 PM
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rebuild it yourself..it is the least expensive way.used is a gamble as it mite be as old and worn as yours was.
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Old 02-23-2009, 12:20 PM
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how do you get to the diaphragm? i removed the 8 screws that hold down what i would think is the cover for the diaphragm but it wont move. im hoping i dont have to take the whole pump off the engine case.

Last edited by mmmcheechy; 02-23-2009 at 12:25 PM.
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Old 02-23-2009, 06:30 PM
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Quote:
Originally Posted by mmmcheechy View Post
im hoping i dont have to take the whole pump off the engine case.
That is the first thing to do.

Here you go: http://www.youtube.com/watch?v=MU4bwVe1VTg
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Old 02-25-2009, 12:31 PM
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Thanks for the video thats on my list for my 87 300D
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300, 300d, 300td, benz, detail, engine, failure, membrane, mercedes, pump, removal, suction, vaccum, vacume, vacuum

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