Thanks vwnate1 and diesel911, it is a puzzle coming together.

Interesting that the 1979 240D diagram seems to indicate a brake booster line with two nipples. My 1979 300D's brake booster line only has one separate check valve and one 'open' nipple separate from the check valve.

haha I also liked the "Jungle" note on that spaghetti.

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1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
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1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD