The ESP and BAS warning lights may illuminate due to a failed brake light switch. Replacement of the failed switch should correct this concern.Google+
Car Problem Reports
Mercedes-Benz CLK320 Brake Light Switch Failure May Cause ESP/BAS Warning Lights
Mercedes-Benz CLK320 Problem
Average Mileage: 126,863 mi (87,850 mi - 168,000 mi)
Visitor, 2001 Mercedes-Benz CLK320, 109,000 mi
The following dashboard warning lights come on together, displayed sequentially: ESP, BAS, Bulb failure when brake pedal depressed. This is an intermittent problem, sometimes the problem disappears for several days only to reappear again. Have replaced brake limit switch under brake pedal twice already (with new Beck/Arnley replacement part from RockAuto), but problem has come back after a few weeks to months after each replacement. I have another new switch ready, but it is also a Beck/Arnley, so I don't know if it will fail soon as well. Could the problem be elsewhere in the electrical system?
Today I went to MB dealer purchased new switch cost 22.50
Labor: put in by myselef cost 15 mins time
Thanks you very much for your info.
Visitor, 2000 Mercedes-Benz CLK320, 100,329 mi
Yes i have this problem as well with my brake light switch.
The part has been changed and yet still the warning light comes on and
the car still don't go into park until you cut-off the car then put it in park.
What is this?
Visitor, 2002 Mercedes-Benz CLK320, 168,000 mi
Brake lights wouldn't light up when brakes were used.also caused ABS /bas and ESP indicators to come on. I had a mechanic fix the brake switch. Now the brake lights work when brake pedal is pressed.