Does anyone know if it makes a difference if the two vacuum lines that go to the the brake booster line are switched?

It looks like the vacuum lines are attached to a check valve of some sort and for some reason it has two vacuum lines. Does the check valve care which which line it is attached to?

This is a 1985 Calif turbo if it makes any difference.

I found a vacuum system diagram in the front of the engine compartment near the radiator. It helped but it really has a kluged quality to it.

I could decipher some of it and I hope enough to have the two hoses connected correctly but colors aren't seeming to completely follow the diagram.

I sure am not going to start re-arranging things. I'll just assume it is correctly "wired" and deduce which goes to which side of the check valve. This isn't too bad an assumption because this car was pretty well taken care of I don't think anyone including myself previously torn into and rearranged the vacuum system.

Well. I think your terminology is not quite correct. You say, " two vacuum lines that go to the the brake booster line are switched? " Well, I guess that is OK, though I would say two vacuum lines that come from the the brake booster line are switched? Anyway, I don't think it makes any difference if they are the same size ports, both are drawing from the same or equal vacuum source.

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Junqueyardjim
Christianity, if false, is of no importance, and if true, of infinite importance. The only thing it cannot be is moderately important. C.S. Lewis



1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA

2003 Jaguar Type X, AWD. beautiful, good mileage,
Mom's car, but I won't let her drive it!

You make an interesting point... maybe all three lines have vacuum. Shouldn't be brake booster line (the large line with the check valve in it) be connected to a source vacuum. Maybe somehow the other smaller lines to the check valve are throttling the vacuum???

The Fat End with the Check Valve is closest to the Barke Booster. Since the Check Valve is a one way Valve it makes a difference which way it goes.

On mine starting with the Brake Booster and going forward you will reach the Check Valve First. After that there is 2 smaller Nipples (some Models only have one small Nipple). Further forward is the Main line ending at the Vacuum Pump.

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84 300D, 82 Volvo 244Gl Diesel

The reason I was messing with the thing was that I was replacing it because of broken nipples at the check valve. This is a bit like the story of Edison asking a newly minted engineer the volume of a light bulb coming back a week later to finding working out the complex mathematics and asking him why he didn't just fill the bulb with water and measure that.

I had the old check valve which I dissected. The check valve connector come before the check valve. This makes Junqueyardjim and Diesel911 correct. The small tubes "see" the vacuum pump without a check valve and they have very small orifices. I'm not sure if they are the same size because I may have enlarged one of the holes. Let's make them approximately the size of a sewing pin, the type that women hold fabric together with when sewing.

My guess is they are the source for a lot of the rest of the vacuum system in the car.

diagram.
#140 is the Check Valve and the number is at the brake booster end of the valve.

Attached Thumbnails

     

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84 300D, 82 Volvo 244Gl Diesel

Thank you....

This looks like the diagram on the decal near my radiator. My complaint was that following some of the tubing from a source on the wheel well, it transitioned to a color different from what the diagram was telling me (on the other side of the check valve nipple).

I also didn't want to try rearranging tubing to get colors to match up. I would never get it back to the original state if I started doing that.

Was that diagram out of the Mercedes manual if so what was the title of the manual?
Thanks again.

It was a Diagram Posted by someone else that I copied. But, it looks like it is from the Mercedes Manual.

I don't have the site but if you regester with the Mercedes EPC you can look at the Manual for free.
Mercedes also sold the Manual on CD.
Part numbers for service Manuals STARTEK
Star Service CDs and DVDs
Contact Consumer Promotions at 1-800-FOR-MERCedes for current pricing and ordering information on the accompanying CDs and DVDs that are available for purchase.

Please note you need to pay attention to what Computer Operating System the CD will Work on.

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84 300D, 82 Volvo 244Gl Diesel

That's good information, thanks again.....