1989 260E

I want to check for vacuum leaks which could affect my shifting and my brake booster. The problem is, I don't know where to start looking.

When I open the hood, what am I looking for? Where do I start?

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2008 E350 4matic / Black/Anthracite

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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black