One problem related to brake disc pads has been reported for the 2004 Mercedes Benz E320. The most recently reported issues are listed below.
A warning signal appeared on by dash board citing brakes, take to shop. The Mercedes Benz service center put on front brakes pads and rotors. I was told toded to replace the sbc united because it was "timed out" and the brakes could fail. The cost of unit is $2418. 32. This is life threatening. There should be a recall.