Parking brake function - Release not possible
â–¶ How to fix
Switch ignition off and wait 5 minutes or switch battery main switch off and retry to release the parking brake. Try to release parking brake at maximum supply pressure. Check pneumatics of vehicle (e.g. blockage in pipings) if no problem found in the pneumatics replace EPB ECU.
What you'll see
No driver-visible symptom recorded.
System reaction
No user functions are available. Red warning lamp.
Diagnostic depth
Detection
Release timeout failure occurred more times than allowed.
Possible cause
Insufficient supply pressure, or sticking piston or faulty pressure sensor.