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  #1  
Old 09-02-2010, 01:46 PM
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vacuum pump specs

Does anyone know what vacuum should be for my '84 300sd? When I unscrew the main line at the pump i get 3in idling and about 15 when I rev it up, also should it hold vacuum after you shut it off? It also wont shut off with the key,but the locking system still works. Where can I get info on the vacuum system, thanks Mike

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  #2  
Old 09-02-2010, 05:16 PM
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You need over 20 for the Brake Booster to function properly.
I PMed you some info. look in the, Brakes Pneumatic section.

One of our members must have a write up on it:
DIY Repair Links
http://www.peachparts.com/shopforum/diy-links-parts-category/

http://www.peachparts.com/Wikka/DoItYourSelf
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  #3  
Old 09-02-2010, 05:27 PM
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Just add Diesel.
 
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Also, the locking system in your 300SD has a separate pump, which is located in the trunk, and operates electrically. It does not connect anywhere to the front engine operated pump.
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1983 Mercedes Benz 300SD - Wife calls him "Chitty Chitty Bang Bang"
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Old 09-02-2010, 06:17 PM
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Regarding holding vacuum after shutoff, there should be a vacuum reservoir in the rear which will store vacuum to operate door locks, etc after shutdown. It looks similar to an egg carton.
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  #5  
Old 09-02-2010, 06:52 PM
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Quote:
Originally Posted by b2948kevin View Post
Regarding holding vacuum after shutoff, there should be a vacuum reservoir in the rear which will store vacuum to operate door locks, etc after shutdown. It looks similar to an egg carton.
Not on an SD. See post #3.
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  #6  
Old 09-02-2010, 07:01 PM
b2948kevin's Avatar
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Oops, disregard

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