Mercedes-Benz GLB 2021 Series Operator's Manual page 171

In the following situations, the electric parking
brake is also applied:
Active Distance Assist DISTRONIC is bringing
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the vehicle to a standstill.
The HOLD function is keeping the vehicle sta‐
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tionary.
Active Parking Assist is keeping the vehicle
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stationary.
This is the case if one of the following conditions
is also fulfilled:
The engine is switched off.
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The seat belt tongue is not inserted in the
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seat belt buckle of the driver's seat and the
driver's door is opened.
There is a system malfunction.
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The power supply is insufficient.
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The vehicle is stationary for a lengthy period.
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When the electric parking brake is applied, the
red F (USA) or ! (Canada) indicator lamp
appears in the instrument cluster.
The electric parking brake is not automatically
applied if the engine is switched off by the ECO
start/stop function.
Electric parking brake function (releasing
automatically)
The electric parking brake is released when the
following conditions are fulfilled:
The driver's door is closed.
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The engine is running.
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Vehicles with automatic transmission:
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The transmission is in position h or k and
you depress the accelerator pedal or you
shift from transmission position j to h or
k when on level ground with the driver's
door closed.
If the transmission is in position k, the tail‐
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gate must be closed.
The seat belt tongue is inserted into the seat
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belt buckle of the driver's seat.
Driving and parking 169
Vehicles with automatic transmission: if the seat
belt tongue is not inserted into the seat belt
buckle of the driver's seat, one of the following
conditions must be fulfilled:
You shift from transmission position j.
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You have previously driven at speeds greater
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than 2 mph (3 km/h).
When the electric parking brake is released, the
red F (USA) or ! (Canada) indicator lamp
in the instrument cluster goes out.