Mercedes-Benz E-Class Sedan Operator's Manual page 391

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Possible causes/consequences and
If you do not wish the electric parking brake to be applied, leave the ignition switched on, e.g. when washing the
vehicle in an automatic car wash or when having the vehicle towed away. This is not necessary when towing the
vehicle away with the rear axle raised.
If the electric parking brake is not applied automatically:
Switch off the ignition and turn it back on.
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Release and then apply the electric parking brake manually .
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If it is still not possible to apply the electric parking brake:
Consult a qualified specialist workshop.
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Where necessary, also safeguard the parked vehicle against rolling away.
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To release:
If the conditions for automatic release are fulfilled and the electric parking brake is not released automatically,
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release the electric parking brake manually .
If it is still not possible to release the electric parking brake:
Do not continue driving under any circumstances. Consult a qualified specialist workshop.
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Display messages and warning/indicator lamps 389
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