Mercedes-Benz GLC 200 4MATIC Owner's Manual page 502

Display messages
!
Parking brake Switch on
vehicle to release
J
Brake immediately
J
Malfunction See Owner's
Manual
Possible causes/consequences and
* The red ! indicator lamp is lit.
You have attempted to release the electric parking brake with the vehicle switched off.
Switch on the vehicle.
#
* A malfunction has occurred while the HOLD function was activated.
A horn may also sound at regular intervals.
You cannot start the vehicle system.
Immediately depress the brake pedal firmly until the display message disappears.
#
You cannot start the vehicle system again.
* The brake force boosting function is impaired.
Hill Start Assist may be impaired.
& WARNING Risk of an accident due to a brake system malfunction
If the brake system is malfunctioning, braking characteristics may be impaired.
Drive on carefully.
#
Have the brake system checked immediately at a qualified specialist workshop.
#
Solutions
M
Display messages and warning/indicator lamps 499