Where are most vacuum leaks found? In the engine compartment?

[Carrameow]

Ever wish Mercedes hadn't used Vacuum lines so much? At least my car shuts down and the doors lock correctly. I've heard some owners can cycle there locks as many as 4 or 5X.

When those rubber connectors start to get old everything goes on the Fritz. Looking for brittle connections or bad elements every year is getting to be a pain in the butt.

I'm sure Mercedes had its reasons and I 'm not about to second guess them

Where are most vacuum leaks found? In the engine compartment?

The latest one I found during routine underside maintainance was on the transmission modulator.

The most important thing I found is a lot of rubber hose on the market is C^%*& and you have to use fuel line grade or better, which often doesnt come in small sizes. Also those START or HELP rubber fittings grab great in the beginning but they are short lived garbage in a high heat environment.

I f diesel wasn't 5 a gallon I would consider selling a whole box of replacement OEM grade rubber connectors.

[300SDog]

I usually start with cuttin back every rubber elbow and connection 1/4" with razor blade on every old MB i've owned. Seems to help tighten up insidious leaks.

[Hatterasguy]

I went nuts last year and replaced every rubber vacuum connection that I could find under the SDL's hood, and removed a lot of old emissions related vacuum crap. So knock on wood hopefully as it ages I don't have to many vacuum problems.

Other than a slow door lock I havn't had any vacuum problems. I think I replaced the shut off valve when I got the car back in 04, other than that no issues.