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Old 01-12-2019, 05:50 PM
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Join Date: Jun 2018
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W116 Vacuum System: What did I break?

I decided to try to track down some of my vacuum leaks on my 1980 300SD. Of course, as soon as I started to disconnect things, parts started to break. Knowing that I am showing extreme ignorance, what is this part and what does it do? I am assuming it is a vacuum step down or filter but can't find a part number and I have no idea which system(s) it will impact. Thanks, Seth
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W116 Vacuum System: What did I break?-vacuum-break.jpg  
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Old 01-12-2019, 09:57 PM
Maximan1's Avatar
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Location: Anaheim
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Looks like your brake booster check valve. Part number 1234307429. Comes with the hard line.
Milan Brown 1979 240D (dead), currently rebuilding a 1985 OM617 to swap in.

1996 Honda Civic (daily driver)
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Old 01-12-2019, 11:51 PM
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Originally Posted by Maximan1 View Post
Looks like your brake booster check valve. Part number 1234307429. Comes with the hard line.
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Old 01-13-2019, 12:14 AM
vwnate1's Avatar
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Join Date: Nov 2005
Location: Sunny So. Cal. !
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Post Brittle Plastic Bits

FWIW, you prolly didn't break it, look at the white part, it's usually all cracked and ready to fail .
1982 240D creampuff 370,000 miles
1978 300CD back from the dead&1980 300CD ~ SOLD
1984 300CD KEEPER ! 430,XXX miles
1984 Euro 300TD Fully optioned SWMBO's
1974 350SLC 4 speed stickshift SOLD & missed
Krazy Kommie Ural Motos (3)
BMW Moto R60/6 Barn Find, 8,000miles
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Old 01-14-2019, 08:07 PM
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Join Date: Jun 2018
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There is no part number (Maximan's suggested # is close, but isn't correct for this car) and MB Classic was unable to verify... although they are still doing research. Attached are some additional photos -- now that they are posted, I can see that the photos are upside down.

It looks like the smaller vacuum hose is either clear/white but has yellowed with age or was a light yellow.

Parts Drawing: seems to indicate that i broke part 208 (part # for this might be 116-430-3229) or 214p (which could include the broken part and has a part # that might be 110-997-4782). Part 208 runs from the vacuum pump to the brake booster and has three rings in the drawing (I am assuming the grommet near the vacuum pump and two in-line check valves are the rings. It also seems to have the correct number of "t"s branching off.
Photo1 shows the hose going from the vacuum pump. Before it gets to the first check valve, it has two “T”s that branch off.
Photo2 shows the main hose between the two check valves. You can see the black hose that “T”s off from here. The end of this black hose is used to hold the part I broke. You can see some of the broken part of still in the hose. The clear/white smaller hose connected to the broken part at a 90 degree angle via the red connecting piece.
Photo3 shows the broken part – whose bottom part is stuck in the black hose that branches off.

Any insights? Thoughts?
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W116 Vacuum System: What did I break?-parts-drawing.png   W116 Vacuum System: What did I break?-photo-1.jpg   W116 Vacuum System: What did I break?-photo2.jpg   W116 Vacuum System: What did I break?-photo6.jpg  
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