Hello boeser Dieter, Hi @ Bin on Saturday time again with the SLK 300km on the highway. On the return drive I had to chase a camper from the left lane and am full on the horn. The started also but after 10 seconds was finished although the thumb was full. Since then it is not going any more. Safes in the box are all good. Can the horn be broken after ten years ? With hardly 10 rain drives, never snow and salt ? Have I never had, with unsealable cars in 37 year Thank you for your answers. Greetings Walter PS Haette I almost forgot, w 170 slk 200 without compressor. Year of construction 10/99 Model 2000