One problem related to brake light switch has been reported for the 1999 Mercedes Benz SLK230. The most recently reported issues are listed below.
Driver side brake light fails. Took to mercedes several times. They tell me it is a known issue with the mercedes slk 230 from 1998 to present. I searched online and found hundreds of complaints of the same issue. Mercedes is waiting for a death to occur as a result of a faulty tail light assembly before they decide to recall and fix the problem whick will certainly occur in time.