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Old 09-29-2001, 10:14 AM
sco_b
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brake vacuum booster config

for the last month or so i noticed my transmission has been shifting really rough. i thought i had already checked all the vacuum connections but last weekend i found one of the hoses that was supposed to be on the vacuum brake booster line dangling with the plastic "port" broken off inside the rubber connector. anyway, i played with the thing forever until i figured out the brake booster line is a one piece unit and you just unscrew both ends to remove it. EASY!

it was also an easy re-installation once i got the new part from fastlane yesterday. i vaguely remembered how the hoses were supposed to reconnect. i started her back up and went on a little drive. the transmission is back to shifting smooth as silk. i was happy until i went to remove the key and the engine would not shut off. i know from previous experience this has to do with a vacuum hose. i need to make sure i put the vacuum brake booster line back the way it is supposed to go. i cannot find any diagrams for my '84 300D turbo that explain this. can someone with the same car check theirs out and tell me which port the vacuum hoses connect? i currently have the hose installed with the arrow on the center valve pointing away from the brake booster (toward the front of the car). is this right?

thanks

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Old 09-29-2001, 01:40 PM
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Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
Can't tell you the colors on an 84, but the 115 chassis lines were brown and brown with blue stripe. You probably didn't disconnect the line to the IP, so the brown with blue stripe should go to the ignition switch.

I don't think there is a check valve in the cutoff system -- it only ports vacuum to the IP to shut it off. There isn't any vaccum in it when the engine is off.

You can check the operation of the check valve by sucking on it -- I think the arrow point to the direction of flow (so you have it correct).

You can check operation of the cutoff by sucking or using a vacuum pump with the key off -- pull a vacuum on the supply line (or what you think is the supply line) and check for vaccum at the line on the IP. Turn the key on and repeat -- should not have vacuum. Only the ignition cutoff is on this system, nothing else.

The two lines with vacuum check valves are for the AC and the locks.

Peter
__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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Old 09-30-2001, 04:41 PM
sco_b
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thanks for the help. all is well with the vacuum hoses now.
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Old 09-30-2001, 07:28 PM
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Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
I was wrong, the brown with blue stripe goes to the cutoff, the brown goes to the ingnition switch. Impossible to confuse on the 87 as they are about two feet apart, but easy on the 115s!

Sorry for the confusion -- probably a senior moment a few years early.

Peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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