Not wanting to step on any toes here, but I read a post in this forum, way back, that described the ill effect using the wrong brand of brake light bulbs had on the Mercedes cruise control system.

Use only Oshram or Bosch brand bulbs. Just plugging in an 1157 bulb from Auto Zone or Pep Boys will cause the cruise to shut down. These bulbs(1157) are not designed to supply a critical ground to the cruise control circut.
This seems rather odd. But after I replaced a burned out brake light with one I had on hand, my cruise began acting up. Lurching,not activating,accelerating without leveling off, etc. I didn't realize the bulb cause until I read the post. After replacing the "new" bulb with a Oshram, I had cruise control again.

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Selling used Mercedes parts on Ebay...always changing...
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