How do you change the rear brakes on a 2003 Mercedes C320?

Answer 1

Yes these cars do have sbc (electronic brakes) but you do not need to de-activate the system before you replace the brake pads.

Take key out of ignition

You should have a 'floating' type caliper, remove the rear wheels and remove the brake calipers, should be either a torx bolt or a Allen bolt? don't remember. unscrew those 2 bolts on the backside of the caliper. remove the caliper and replaced the pads, re-install in oposite direction.

*note* after your finished start engine but do not press the brake pedal until after you hear the sbc/brake pump prime itself, if you touch the brake pedal to soon, you will sometimes cause a red warning message in the cluster because it thinks the pressure is to low, which you will then have to clear the codes for.

Is a good choice to have done at the dealer, but you can do it yourself.