The brake booster is located next to your radiator. You will see a vacuum line from your intake manifold to the booster.

There is a thread about rebuilding the brake booster here--> http://www.peachparts.com/shopforum/vintage-mercedes/269486-fintail-brake-booster-3.html

Can you take a picture or your temperature gauge at operating temp? Would love to see the car too!

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1962 220Sb ~ The Emerald Bullet http://www.youtube.com/watch?v=hx6tN1W48_o
1957 Ponton 220S
2001 S600 Daily Driver
The Universe is Abundant ~ Life is GOOD!http://www.classiccarclock.com