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Old 10-18-2009, 04:49 PM
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Join Date: Jun 2007
Posts: 183
which lines to block for shut off

My computer is doing weird things... can't sue certain parts of g-mail, and when I click 'search' I only get teh top corner of the box... so in the meantime I want to be able to shut off my car. Which are lines going to the doors? Maybe that will help isolate the problem, although my brakes feel weak, so I'd assume the leak was before the booster.
1981 300D 205,000 mi.
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Old 10-18-2009, 04:57 PM
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Join Date: Jan 2002
Posts: 18,355
If your brakes are weak you either have a big leak in the main vacuum line going to the booster or a bad vacuum pump. Plugging the yellow line under the hood will cut out all the door locking components.
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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Old 10-19-2009, 06:22 AM
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Join Date: Nov 2007
Location: Cameron Park CA
Posts: 1,863
Sounds like a bad vac. pump. Disconnect the 19mm vacuum fitting at the brake booster and with the car running plug the hole with your thumb. You should fool a moderate/strong suction. Do this with all lines disconnected from the main vac pipe and all the nipples plugged. A vacuum gauge is also a good thing to buy if you own a w123.

The yellow lines with stripes are the door element lines. Green striped line is your climate control which leaks just as often as doors.
1981 300SD 512k OM603

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