One problem related to brake light on has been reported for the 2004 Mercedes Benz SL55. The most recently reported issues are listed below.
The vehicle has 70000 miles and on January 10, 2019 I was approaching a stop light and suddenly with no warning (until after the fact ) had no brakes, fortunately I was able to accelerate through the light immediately after brake warning light and beeping. I was able to stop the vehicle on the roadside. Codes indicated failed sbc.