Replaced one 4way and three 3way vacuum connectors, the old ones had little cracks in it. Break feeling is much better now and I got rid of an annoying zooooming sound under the dash.

Great feeling when a small investment pays off!

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).

Hey Jorn, Just out of curiosity, what do you suppose the zooooming noise was under the dash?

I'm not sure, but I guess it was escaping air, it would last and change in tone for a couple of seconds after turning the engine off. In the beginning it would only be there if I used the heater the day before, but the last months the sound was always present. Drove me nuts, now there is still a little rattle; sounds like someone is rattling a key chain...something is loose under the dash.

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).

Jorn,

If you have an auto trans, I hope you didn't replace the triconnector on the vacuum valve with one with out the restriction.

If you did, you will be looking for another transmission soon.

P E H

What do you mean, you are scary me. See photo's, for the the connectors I replaced please tell me they are the right ones. These are the only one available.

Attached Thumbnails

   

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).

Jorn,
Though I am in no way attempting to speak on behalf of PEH, I believe he may be referring to the tri-valve/connector in the main vacuum line that leads directly to the brake vacuum booster. If so, mine is grey and has two diverter nipples going off at 90 degree angles from the main line. I'll be watching this one carefully since one of the nipples broke recently on my '84.

__________________
Steve
'87 300TD - 132K - Soon 4-Sale
'84 300D Turbo - 122K - Driving
'77 VW Type II - 77K - Restored
'08 250EX Ninja
English Bulldog (Brier) - My best friend. Passed away 12/02/04 while in my arms.

Long way to get to the photo but this is what I think he refers to.

http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1AQ11OMUJ1DT148EM3&year=1984&make=MB&model=300-DT-001&category=N&part=Booster+Vacuum+Hose&appChassis=_any

__________________
Steve
'87 300TD - 132K - Soon 4-Sale
'84 300D Turbo - 122K - Driving
'77 VW Type II - 77K - Restored
'08 250EX Ninja
English Bulldog (Brier) - My best friend. Passed away 12/02/04 while in my arms.

Don't forget to replace the straight vacuum connections. they are rubber and can deteriorate as much as the 3/4 way connectors. check the hard lines for crackes and oil. clean them with carb cleaner or brake cleaner.

Dave

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1970 220D, owned 1980-1990
1980 240D, owned 1990-1992
1982 300TD, owned 1992-1993
1986 300SDL, owned 1993-2004
1999 E300, owned 1999-2003
1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD
1988 560SL, 100,000mi, owned since 1995
1965 Mustang Fastback Mileage Unknown(My sons)
1983 240D, 176,000mi (My daughers) owned since 2004
2007 Honda Accord EX-L I4 auto, the new daily driver
1985 300D 264,000mi Son's new daily driver.(sold)
2008 Hyundai Tiberon. Daughters new car

Jorn,

The vacuum tri connector I'm talking is the one that connects the vacuum supply to the vacuum valve mounted on the IP and the transmission. It has a restriction in the lead going to the vacuum supply which alloaws the vacuum valve to vary the vacuum to the transmission depending on the position of the throttle.

This connector looks like he one in the pictures but should have a plastic clip on the lead that has the restriction inside it.

This is only applicable to cars with auto transmission.

P E H