Vacuum Hose/Tube and Check Valve Help - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 03-06-2013, 08:17 AM Thread Starter
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Post Vacuum Hose/Tube and Check Valve Help

I'm new to Benzworld and I'm looking forward to being part of this Mercedes web community.
I need some advise from someone who is familiar with old Mercedes sedans. I have a 1971 Mercedes 250 that's been in the family since it was purchased new. There is a vacuum hose and some kind of check valve on that hose that needs to be replaced. The vacuum hose runs from what appears to be the manifold to a large round metal plate which is mounted to the firewall, (the hose provides a vacuum for the brake system). I hope that all makes some sense.
What is this hose and check valve called? I want to make certain I order the correct parts. Unfortunately the hose cracked while I was trying to remove the broken check valve. I noticed that the engine has run rough ever since the valve broke.

I sincerely appreciate any help.

Thank you,
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post #2 of 3 (permalink) Old 03-06-2013, 09:54 AM
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Welcome to the forum. Pls consider filling out the rest of your profile with location, etc.

I replaced that same hose on my 280. Both the check valve and the hose are (were, at any rate) available from Napa Autoparts. You should also try Ron, the gentleman who moderates this forum. I'll PM you with his POC info.
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post #3 of 3 (permalink) Old 03-06-2013, 12:43 PM
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If that line or the check valve is faulty, the entire hose is replaced. Even the original vacuum line from MB is cheap. The check valve and the hose are shrunk together (hose is heated) and you are not supposed to take it apart. MB Part number is probably A1084301529.

The large black cylinder is the vacuum brake assist drum.

If there is a vacuum leak, the engine will suck in false air for which there is no fuel, that explains the rough running: too much air.
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