Vacuum hose leak - Mercedes-Benz Forum

 
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post #1 of 5 (permalink) Old 07-15-2012, 08:10 PM Thread Starter
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Vacuum hose leak

I am slowly knocking out my hit list on this car and finally decided today was the day to tackle the vacuum issue. Everything works vacuum wise except the door locks (as far as I can tell). Instead of as others have suggested breaking it down piece by piece and connection by connection I took a soapy water bottle and tracked down each line and connection spraying them looking for bubbles. I found on spot where there is a leak. Granted once this leak is fixed there could be others but for now this is the only one I can find. Anyone familiar enough with the vacuum system to tell me if these connections are the doors for sure. If so anyone know the parts I would need to order to replace them? I think I have found the hoses, connectors, and valves on autohausaz just wanted to make sure.

Thanks ahead of time!
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1976 240D 115 Pumpkin Orange 700,000+ miles and rising!

http://www.benzfix.com
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post #2 of 5 (permalink) Old 07-16-2012, 10:12 AM
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Those aren't actuators - the door lock actuators are inside the doors themselves, with long rods attached to the locks. They run about $80 or so, last I bought one.

I have something in my 108 that looks similar - mine's a check valve to keep vacuum in the brake system after the engine stops. The things in your pic might offer the same thing, but for other vacuum-actuated items.

I've hunted in vain, for years, to find a complete vacuum diagram for my 108. If you find a source, I'd be interested in hearing about it. It might be a spring board to getting to where I need
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post #3 of 5 (permalink) Old 07-16-2012, 10:19 AM Thread Starter
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Yeah I knew they weren't actuators for the doors - I have found those in all the doors expect the driver side. The driver side disappears into the door and then out into the engine area which I cant easily get to/track down. I was hoping it came out into these and the reason for the lack of pressure elsewhere was bc of this leak. I guess I need to figure out where the three from the door feed into. Any guidance on where the driver door goes once it "disappears".

On a side note - I do not think MB has a complete vacuum diagram for these things at least I havent been able to find one. I think they "winged" it anyways when they designed/built these because it really doesnt make sense and could be much more simplistic!

EDIT:
I ended up finding close to my vacuum diagram - cant find 115 but the 123 is close. If anyone else is wanting here it is.
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1976 240D 115 Pumpkin Orange 700,000+ miles and rising!

http://www.benzfix.com

Last edited by Dads Pumpkin; 07-16-2012 at 12:42 PM. Reason: Update Info
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post #4 of 5 (permalink) Old 07-16-2012, 05:55 PM
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Hah! You think yours is bad? Try a coupe which has the added plus of having "vacuum seat lockers"
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post #5 of 5 (permalink) Old 07-16-2012, 06:06 PM
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Yay for manual everything! I think I have two vaccume hoses one to the air cleaner and one to the brake booster!
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