Why are there vacuum lines running to 300 cd seats??

It's a safety feature to keep the seat backs from crushing the front seat occupants in the event of an accident.

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83 SD

84 CD

x2

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)

removing this feature will enable the back seat passenger to assist
the driver or front seat passenger to exit through the windshield in
the event of an accident.

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81 Mercedes 300SD 289k.......SOLD
82 Mercedes 300CD 252k......slow ride

82 mercedes 300 SD...mi Unknown
83 Mercedes 300D ????ksniff..gone too
84 Mercedes 300D 148k........SOLD
85 Mercedes 300TD 386k and holding some one elses project

Good thing MB decided to make this feature vacuum powered instead of a button on the seat, so when the rubber inside it fails your climate control won't work, your engine won't shut off, and you'll go through the windshield in a crash. 2/3 of those have happened to me

I removed the driver's seat once to get at the vacuum pod inside, but it requires disassembling the seat and I don't have the replacement rubber.

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1980 240d
1999 SL500

Too true. I love bells and whistles as much as the next person but there's a few things like this that it seems like they deliberately went out of their way to invent a complication.

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~Michael S.~
Past cars:

1986 300SDL
1987 300SDL
1982 240D
1982 300SD


Current:

1987 300SDL

Hahahahahahahaha
I like that one.

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Selling used Mercedes parts on Ebay...always changing...
cdplayer51 take a look!
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The folding seat backs are only in the coupes The vacuum diaphrams under the seat keep the backs from falling forward in a collision.

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81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.