How to Reset a C320 Brake amp; Service Message
1. Turn the ignition switch to position 2. Do not start the engine.
2. Press the menu button on the left side of the steering wheel until the odometer is displayed.
3. Press the arrow keys on the left side of the steering wheel until either the service or brake message is displayed.
4. Press and hold the trip odometer reset button on the left side of the instrument cluster until the reset confirmation message appears on the instrument panel.
5. Press and release the trip odometer reset button to confirm and complete the reset.