Mercedes-Benz C-Class Saloon 2022 Owner's Manual page 256

If you do not react to the warning, autonomous
braking can be initiated in critical situations.
In particularly critical situations, Active Brake
Assist can also initiate autonomous braking
directly. In this case, the warning tone is sounded
and the L distance warning lamp lights up
simultaneously with the brake application.
If you apply the brake yourself in a critical situa-
tion or apply the brake during autonomous brak-
ing, situation-dependent brake force boosting
occurs. The brake pressure increases up to maxi-
mum full-stop braking if necessary.
If autonomous braking or situation-dependent
brake force boosting has occurred, pop up
appears in the driver's display and then automati-
cally goes out after a short time.
If the autonomous braking function or situation-
dependent brake force boosting is triggered, addi-
tional preventive measures for occupant protec-
®
tion (PRE-SAFE ) may also be initiated.
& WARNING Risk of an accident caused by
limited detection performance of Active
Brake Assist
Active Brake Assist cannot always clearly iden-
tify objects and complex traffic situations.
In such cases, Active Brake Assist might:
Give a warning or brake without reason
R
Not give a warning or not brake
R
Active Brake Assist is only an aid. The driver is
responsible for maintaining a sufficiently safe
distance to the vehicle in front, vehicle speed
and for braking in good time.
Always pay careful attention to the traffic
#
situation; do not rely on Active Brake
Assist alone.
1
Driving and parking 253
Be prepared to brake or swerve if neces-
#
sary.
If Active Brake Assist is deactivated or the func-
tions are restricted, e.g. due to activation of
another driving system, the ê Active Brake
Assist warning lamp appears in the driver's dis-
play.
If the system is unavailable due to dirty or dam-
aged sensors or due to a fault, or if the functions
are restricted, the Ó Active Brake Assist warn-
ing lamp appears in the driver's display.
Also observe the system limits of Active Brake
Assist.
The individual subfunctions are available in the fol-
lowing speed ranges:
Distance warning function
You are warned by the distance warning function
from approximately 30 km/h if, over several sec-
onds, the distance maintained to the vehicle trav-
elling in front is insufficient for the driven speed.
In this case, the L distance warning lamp in
the driver's display lights up. If the distance to the
vehicle in front continues to decrease at higher