1. Initial Visual Inspection:

• Check for any visible damage or obstructions around the brake area.
• Ensure that there are no warning lights on the dashboard indicating a malfunction.
• Verify that the brake components, such as the calipers and discs, are in good condition and free from rust or debris.

2. Verify Operation:

• Engage and release the electronic parking brake (EPB) several times to check for consistent operation.
• Listen for any unusual noises such as grinding or clicking when the EPB is activated or released.

3. Check Battery Voltage:

• Ensure the vehicle’s battery has sufficient charge, as low voltage can affect the functioning of the EPB system.
• Measure the battery voltage using a multimeter. It should typically be around 12.6 volts with the engine off.

4. Scan for Error Codes:

• Use an OBD-II scanner to check the vehicle's ECU for any error codes related to the EPB system.
• Note down any codes and refer to the Mercedes-Benz repair manual or documentation for specific troubleshooting steps based on the codes retrieved.

5. Inspect EPB Switch:

• Inspect the EPB switch in the center console for any signs of damage or wear.
• Ensure the switch is connected properly and is functioning as intended when pressed.

6. Inspect Electrical Connections:

• Check the wiring and connectors associated with the EPB system for any signs of corrosion, damage, or loose connections.
• Ensure that all connectors are properly seated and secure.

7. Test Actuators:

• Test the EPB actuators to ensure they are receiving power and operating correctly.
• Use a diagnostic tool to activate the actuators and monitor their response.

8. Reset the EPB System:

• Follow the specific procedure outlined in the vehicle’s manual to reset the EPB system.
• This can often clear minor issues and restore proper functionality.

9. Software Update:

• Check if there are any software updates available for the vehicle, especially those related to the EPB system.
• Use the appropriate diagnostic tool to update the vehicle’s software if needed.

10. Seek Professional Help:

• If the issue persists after performing the above steps, it may be necessary to take the vehicle to a qualified Mercedes-Benz technician for a more in-depth diagnosis and repair.
• Provide the technician with all the details of the steps you have already taken to troubleshoot the issue.