One problem related to brake light on has been reported for the 2013 Mercedes Benz E350. The most recently reported issues are listed below.
I was driving and almost hit the car in front of me and the brakes light went on "low fluid" taking it to manhattan benz and they charge me $8614. 50 because they have to replace all the rusted brake lines. Iam 80 and max. Driving 5000miles/yr.