About six times out of ten if I softly touch the brake pedal I will hear a short buzz -- lasts about a half-second. It sounds like a very short version of the buzz you hear when you leave the lights on or the keys in the ignition. Occurs after starting the car, while still idling in park. Is this normal?

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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