EPC doesn't have anything on the vacuum line to the brake booster for the W124, it unhelpfully says "for models 201, 124, see standard microfiche". Which, of course, I don't have.
The nipple on the non-return valve broke off, ancient brittle plastic. I need to acquire a new one, but PeachParts and that auto Haus in AZ don't seem to have it. If I could at least get the part #, that would be a start, but EPC is useless here. Help!

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RIP:
2011 E350 BlueTEC, Schwartz 81k (totaled by uninsured drunk driver)
1964 Unimog 404.1 (wrongfully towed by the city)
1994 E320, Brilliantsilber 208k (transmission shuffled off after sudden catastrophic fluid loss)
1982 300D, Silberblau under a blue repaint 256k (sold for parts)
1995 E320 Polarweiss, 131k (sold for parts)
1995 E300D Polarweiss, 287k (totaled by drunk driver)

BTDT - 124 430 12 29

Check your PM.

Sixto
87 300D

Boom. Sorted.

__________________
RIP:
2011 E350 BlueTEC, Schwartz 81k (totaled by uninsured drunk driver)
1964 Unimog 404.1 (wrongfully towed by the city)
1994 E320, Brilliantsilber 208k (transmission shuffled off after sudden catastrophic fluid loss)
1982 300D, Silberblau under a blue repaint 256k (sold for parts)
1995 E320 Polarweiss, 131k (sold for parts)
1995 E300D Polarweiss, 287k (totaled by drunk driver)

LOL...
Been there done that. It's the whole assy from the Vac Pump to the Brake Booster. It's pretty cheap overall. Takes a whole 15 minutes to change out. You can't get just the valve.

Looks like this:

Attached Thumbnails

 

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92 300D 2.5L OM602 OBK #59

What's a non return valve? The only nipple i see on mine goes to the shut off on the ignition switch. Mine broke and i just plugged the end with epoxy and T'd off the other vacuum hookup at the vac pump -- the one that already has like a 3 way on it and goes to the trans vac control valve and over to the egr. I swapped the 3 way for a four way i think. Car shuts off great .

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What Would Rudolph Do?
1975 300D, 1975 240D, 1985 300SD, 1997 300D, 2005 E320 , 2006 Toyota Prius

It only allows air to flow one way, in this case toward the vac pump.

Bingo. Mine is currently taped up and the brown line to the shutoff switch is attached where the vac supply to the EGR used to be...because I disabled the EGR for diagnostic purposes, and off-road use only. <_< >_> <_<

__________________
RIP:
2011 E350 BlueTEC, Schwartz 81k (totaled by uninsured drunk driver)
1964 Unimog 404.1 (wrongfully towed by the city)
1994 E320, Brilliantsilber 208k (transmission shuffled off after sudden catastrophic fluid loss)
1982 300D, Silberblau under a blue repaint 256k (sold for parts)
1995 E320 Polarweiss, 131k (sold for parts)
1995 E300D Polarweiss, 287k (totaled by drunk driver)

That's a "non" technical term for a check valve. Not to be confused with a nonreturnable valve!!!