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Old 06-26-2007, 10:08 PM
777funk's Avatar
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I'm fed up w/my w124!!! Anyone know anything about the vac system

I Just broke one of the brittle vacuum nipples on the main Vac line to the brake booster.

I'm sooooooooo confused on this car. There's only one line coming off of the thick black Brake Booster line from the pump. I believe it goes to the key because when I broke the nipple there is now no shut-off.

If there's only the one nipple coming off, where do all the other lines get vacuum from???

Anyone got a link to a vac diagram?

-Suburban '93 220k
-Diesel Jetta '03 350k

--E320 '95 200k
-E320 Wagon 1994 155k
-300d Turbo '87 187k miles
-E320 1994 200k
-300d Turbo '84 245k (sold to Dan62)
-300d Turbo '84 180k
-300sd '80 300k
-7.3 Powerstroke Diesel 15P Van 500k+ miles
-190d '89 Non Turbo 2.5 5cyl 240k (my first MB)
Tom's Imports of Columbia Missouri Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's!
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Old 06-26-2007, 10:46 PM
justinperkins's Avatar
I ♥ German Cars
Join Date: Sep 2006
Location: Austin
Posts: 1,312
yes the line you broke taps into the main vacuum line that runs from the pump to the brake booster. it goes to the ignition.

perhaps you did the same thing I did a while ago and broke it while trying to remove/install the GP relay cover?

easy fix, hardly anything to get fed up about. old plastic gets brittle and breaks, not just a 124 issue.

1987 300TD, 1987 300TD
2008 R32, 2000 Passat Wagon
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Old 06-26-2007, 10:55 PM
greasybenz's Avatar
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Location: San Francisco, CA
Posts: 2,082
I broke that line when i was changing the vacuum pump. And the valve in the middle is the line that gives vacuum to the shut off valve.

here is a pic

unfortunatley you cant replace that one valve youll have to relace the entire line with a new one like i did.

here is the hose.

i believe the vacuum pump on the front of the engine has 2 ports. One is for the shut off valve and brake booster. The other is for everything else. I cant say for sure since my 300D isnt with me in SF to check. But someone else will chime in.
05 E320 CDI
07 GL320 CDI
08 Sprinter
05 Dodge Cummins
01 Dodge Cummins

2004 E55 AMG
2002 C32 AMG (#2)
1995 E300
1978 300D
1987 300D
2002 C32 AMG(blown motor :[
1981 300SD
1983 300SD
1987 300SDL
2002 Jetta TDI
1996 S420
1995 S500
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Last edited by greasybenz; 06-26-2007 at 11:21 PM.
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Old 06-26-2007, 11:26 PM
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Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
There are two ports on the pump -- the vac line for the brakes and the fuel shutoff, and a smaller one that goes to a 5-way T. That one provides vac for the transmission control, climate control, and EGR and Air Recirc control systems.

Kinda messy, but MUCH simpler than a GM auto climate control circa 1965.....

1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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