Two additional points:

1. There are two different types of sensors on the new E-class brakes. One of the front wheels has a normal brake wear indicator saying the brakes need replacing. The other front wheel has a sensor at half of the normal wear. If the half wear sensor is on, when it is time for the normal service, I believe your display will read something like "carry out service b+" with the "+" indicating to pay particular attention to the brakes as well as the other service checks. It is more or less to say "if you do the normal service now, you will not make it until the next service before the brakes need changed".

2. I am not saying to do this; just giving information. The new E-class has two batteries so if you were wanted to power down the brake system, you would have to disconnect both batteries. The second one is under the hood, passenger side close to the firewall, and is a small one which I understand is for the brakes in case the other battery suddenly dies.