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Driving safety systems
66
ignition. It goes out when the engine is
running.
Braking
At the instant one of the wheels is about to
lock up, a slight pulsation can be felt in the
brake pedal, indicating that the ABS is in the
regulating mode.
X
Keep firm and steady pressure on the brake
pedal while you feel the pulsation.
Continuous, steady brake pedal pressure
yields the advantages provided by the ABS,
namely braking power and the ability to steer
the vehicle.
The pulsating brake pedal can be an
indication of hazardous road conditions and
functions as a reminder to take extra care
while driving.
Emergency brake maneuver
X
Keep continuous full pressure on the brake
pedal.
G
Warning!
If the ABS malfunctions, other driving
safety systems such as the BAS or the
ESP
®
are also switched off. Observe
indicator and warning lamps that may come
on as well as messages in the multifunction
display that may appear.
If the ABS malfunctions, the wheels may
lock during hard braking, reducing steering
capability and extending the braking
distance.
For more information, see “What to do
if …?” (Y page 528).
BAS
G
Observe Safety notes, see
page 65.
The Brake Assist System (BAS) operates in
emergency situations. If you apply the brakes
very quickly, the BAS automatically provides
full brake boost, thereby potentially reducing
the braking distance.
X
Apply continuous full braking pressure until
the emergency braking situation is over.
The ABS will prevent the wheels from
locking.
When you release the brake pedal, the brakes
function again as normal. The BAS is then
deactivated.
G
Warning!
If the BAS malfunctions, the brake system
still functions, but without the additional
brake boost available that the BAS would
normally provide in an emergency braking
maneuver. Therefore, the braking distance
may increase.
BAS Plus (USA only)
The Brake Assist System Plus (BAS Plus)
operates in emergency braking situations and
uses radar sensors to assess the traffic
situation. BAS Plus assists you in braking at
speeds above approximately 20 mph
(30 km/h).
When traveling in Canada in a vehicle not
registered in Canada, you must switch off the
radar sensor system (Y page 247). Canadian
law does not permit the use of the radar
sensor system for vehicles from outside of
Canada.
When you switch off the radar system, the
following functions are deactivated:
R
BAS Plus
R
PRE-SAFE
®
Brake (Y page 72)
R
DISTRONIC Plus (Y page 350)
R
Park Assist (Y page 369)
R
Blind Spot Assist (Y page 382)
R
Advanced Parking Guidance (Y page 373)
Safety and security