I've got a bit of a strange issue I wanted to confirm with everyone here.

I found my vacuum leak in the climate control (just a disconnected hose, taken care of and the engine shuts off properly now).

While I was testing this, I noticed some odd behavior on the check valve in the brake booster line.

Mine has three outlets (not including the one going to the brake booster). One up top for the lock system and two on bottom. The one on bottom toward the front of the car seems to be working correctly. I get great vacuum from it.

The one towards the rear of the car (also has a small white strip on it) seems to draw very little vacuum. It takes 30 seconds or so to get 20" pulled on it. I'm guessing that my check valve is bad and that I should see the vacuum get to 20" in a couple seconds, not 30+?

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1982 Mercedes 300SD (325k miles)
1986 Mercedes 560SEL (212k miles)
2006 VW Jetta TDI (215k miles)