2012 MERCEDES-BENZ G-Class brake light

Wet roads
G
WARNING
After driving in heavy rain for some time
without applying
the brakes or through water
deep enough to wet brake components, the
first braking action may be somewhat
reduced. You have to depress the brake pedal
more firmly. Maintain a safe distance from
vehicles in front.
After driving on a wet road or having the
vehicle washed, brake firmly while paying
attention to the traffic conditions. This will
warm up the brake discs, thereby drying them
more quickly and protecting them against
corrosion. G
WARNING
Make sure that you do not endanger other
road users when you apply the brakes.
Limited braking performance on salt-
treated roads G
WARNING
The layer of salt on the brake discs and the
brake pads/linings may cause a delay in the
braking effect, resulting in a significantly
longer braking distance, which could lead to
an accident.
To avoid this danger, you should:
R occasionally brake carefully, without
putting other road users at risk, when you
are driving on salted roads. This helps to
remove any salt that may have started to
build up on the brake discs and the brake
pads/linings.
R maintain a greater distance to the vehicle
ahead and drive with particular care.
R carefully apply the brakes at the end of a
trip and immediately after commencing a
new trip,

so that salt residues are removed
from the brake discs. Servicing the brakes G
WARNING
If brake pads or brake fluid other than those
recommended are used, the braking
properties of the vehicle can be degraded to
an extent that safe braking is substantially
impaired. This could result in an accident. G
WARNING
Make sure that you do not endanger other
road users when you apply the brakes.
! If the

brake warning lamp lights up in the
instrument cluster and you hear a warning
tone even though the parking brake has
been released, the brake fluid level may be
too low. Observe additional warning
messages in the multifunction display.
The brake fluid level may be too low due to
brake pad wear or leaking brake lines.
Have the brake system checked
immediately. Have this work carried out at
an authorized Mercedes-Benz Center.
! A function or performance test should
only be carried out on a 2-axle
dynamometer. If you are planning to have
the vehicle tested on such a dynamometer,
contact an authorized Mercedes-Benz
Center to obtain further information first.
Otherwise, you could damage the drive
train or the brake system.
! As the ESP ®
system operates
automatically, the engine and the ignition
must be switched off (the SmartKey must
be in position 0 or 1 in the ignition lock) if
the parking brake is tested on a brake
dynamometer (for a maximum of ten
seconds).
Braking applications triggered
automatically by ESP ®
may otherwise
seriously damage the brake system.
All checks and maintenance work on the
brake system must be carried out at a
qualified specialist workshop. Driving tips
131
Driving and parking Z

Have brake pads installed and brake fluid
replaced at a qualified specialist workshop.
If your brake system is subject only to
moderate loads, you should test the
functionality of your brakes at regular
intervals
by
pressing firmly on the brake pedal
at high speeds. This improves the grip of the
brake pads.
You can find a description of Brake Assist
(BAS) on ( Y page 54).
High-performance brake system for
AMG vehicles The high-performance brake system is
installed only on the G 55 AMG.
G
WARNING
New vehicle brake pads and discs, and
replacement brake pads and discs may take
several hundred miles of driving until they
provide optimum

braking efficiency. Until that
time, you may need to use increased brake
pedal pressure while braking. Please be aware
of this and adjust your driving and braking
accordingly during this break-in period.
Excessive high-demand braking will cause
correspondingly high brake wear. Please be
attentive to the brake warning lamp in the
instrument cluster and brake condition
messages in the multifunction display.
Especially for high performance driving, it is
important to maintain and have the brake
system checked regularly.
The high-performance brake system is
designed for heavy loads. This may lead to
noise when braking. This will depend on:
R speed
R braking force
R environmental conditions, such as
temperature and humidity
The wear of individual components of the
brake system, such as the brake pads/linings
or brake discs, depends on the individual
driving style and operating conditions. For this reason, it is impossible to state a
mileage that will be valid under all
circumstances. An aggressive driving style
will
lead

to high wear. You can obtain further
information about this from your authorized
Mercedes-Benz Center.
Parking brake G
WARNING
While performing this procedure please
assure that the vehicle is stopped before
applying the parking brake. Otherwise the
rear wheels could lock up. You could lose
control of the vehicle and cause an accident.
In addition, the vehicle's brake lights do not
light up when the parking brake is engaged.
Make sure not to endanger any other road
users when you engage the parking brake.
If you drive on wet roads or dirt-covered
surfaces, road

salt and/or dirt could get into
the parking brake.
In order to prevent corrosion and a reduction
in the braking power of the parking brake,
observe the following:
R pull the parking brake upwards with the
release button depressed from time to time
before beginning the journey
(Y page 128).
R Drive a distance of approximately 110 yds
(100 m) with a maximum speed of 12 mph
(20 km/h). Driving on wet roads
Hydroplaning If water has accumulated to a certain depth
on the road surface, there is a danger of
hydroplaning occurring, even if:
R
you drive at low speeds.
R the tires have adequate tread depth.132
Driving tips
Driving and parking

Winter driving
General notes G
WARNING
If the vehicle becomes trapped in snow,
ensure that snow is kept away from the
exhaust pipe and from around the vehicle as
long as the engine is running. Otherwise,
poisonous carbon monoxide (CO) may enter
the vehicle,
resulting in loss of consciousness
and even death.
To assure sufficient fresh air ventilation, open
a window slightly on the side of the vehicle
not facing the wind.
Have your vehicle winterproofed at a qualified
specialist workshop at the onset of winter.
Observe the notes in the "Winter operation"
section ( Y page 244).
Driving with summer tires Observe the notes in the "Winter operation"
section (
Y
page 244).
Slippery road surfaces G
WARNING
The outside temperature indicator is not
designed to serve as an ice-warning device
and is therefore unsuitable for that purpose.
Indicated temperatures just above the
freezing point

do not guarantee that the road
surface is free of ice. The road may still be icy,
especially in wooded areas or on bridges. G
WARNING
On
slippery road surfaces, never downshift in
order to obtain braking action. This could
result in

drive wheel slip and reduced vehicle
control. Your vehicle's ABS will not prevent
this type of control loss.
Do not engage the transfer case in position
LOW when driving on ice or packed snow. At
speeds below 18 mph (30 km/h) vehicle steering
is adversely affected by the Off-road
ABS.
Drive particularly carefully on slippery road
surfaces. Avoid

sudden acceleration, steering
and braking maneuvers. Do not use cruise
control.
If the vehicle threatens to skid or cannot be
stopped when moving at low speed:
X Shift the transmission to position N.
X Try to bring the vehicle under control using
corrective steering.
i For more information on driving with
snow chains, see ( Y page 245). G
WARNING
Make sure that you do not endanger other
road users when you apply the brakes. Off-road driving
Important safety notes G
WARNING
Grains of sand, particles of dirt and other
abrasive materials can enter the brake
system. This can lead to excessive wear and
unpredictable braking efficiency.
After the brakes have been exposed to dirty
conditions, have them checked and cleaned
at a

qualified specialist workshop. Otherwise,
there is a risk that braking power may be
insufficient in the event of an emergency, or
that the braking effect may be unpredictable. G
WARNING
Do
not load items on the basic carrier bars. It
may cause

instability during some maneuvers
which could result in an accident.
Drive slowly in unknown terrain. This will
make it easier to recognize unexpected
obstacles and avoid damage to the vehicle.
To help avoid the vehicle rolling over, never
turn it around on steep inclines. If the vehicle 134
Driving tips
Driving and parking

R
Avoid high engine speeds. Drive at
appropriate engine speeds (maximum
3000 rpm).
R Do not shift the automatic transmission to
transmission position N.
R Always check the vehicle for damage after
off-road driving.
i Information about retrofitting special all-
terrain tires is available from any
authorized Mercedes-Benz Center. H
Environmental note
Protection of the environment is of primary
importance. Treat nature with respect.
Observe all prohibiting signs.
Checklist before driving off-road X
Engine oil level: check the engine oil level
and add oil if necessary.
Only then does the engine receive enough
oil when the vehicle is standing on a steep
incline.
! If the engine oil warning lamp lights up
while the vehicle is in motion, stop the
vehicle in

a safe place as soon as possible.
Check the engine oil level. The engine oil
warning lamp warning must not be ignored.
Continuing the journey while the symbol is
displayed could lead to engine damage.
X Wheel-changing tool kit: check that the
jack is

working and make sure you have the
lug wrench, a robust tow cable and a folding
spade in the vehicle.
X Wheels and tires: check the tire tread
depth and tire pressure.
X Check for damage and remove any foreign
objects, e.g. small stones, from the
wheels/tires.
X Replace any missing valve caps.
X Replace dented or damaged wheels.
X Carry a sound spare wheel. Checklist after driving off-road G
WARNING
If you notice sudden significant vibrations or
unusual handling performance or if you
suspect that damage has occurred to the
vehicle, you should activate the hazard
warning lamps, gently reduce speed and
carefully head for an area that is located at a
safe distance from the road.
Check the tires and the underside of the
vehicle for damage. If the vehicle seems
unsafe, have the vehicle towed away to the
nearest Mercedes-Benz Center or tire dealer
to be repaired.
Driving over rough terrain places greater
demands on your vehicle than driving on
normal roads. After driving off-road, check
the vehicle.

This allows you to detect damage
promptly and reduce the risk of an accident
to yourself and other road users.
X Shift the transfer case to HIGH
(Y page 145).
X Disengage the differential locks
(Y page 148).
X Clean the headlamps and rear lights and
check for damage.
X Clean the front and rear license plates.
X Clean the wheels and tires with a water jet
and remove any foreign objects.
X Clean the wheels, tires, wheel arches and
the vehicle underside with a water jet;
check for

any foreign objects and damage.
X Check whether twigs or other parts of
plants have become trapped. These
increase the risk of fire and can damage
fuel pipes, brake hoses or the rubber
bellows of the axle joints and propeller
shafts.
X After the trip, examine without fail the
entire undercarriage,

wheels, tires, brakes,
bodywork structure, steering, chassis and
exhaust system for damage. 136
Driving tips
Driving and parking

i
Hill start assist will aid you when pulling
away on a hill.
For further information, see "Hill start
assist" ( Y page 117).
Maximum gradient-climbing capability On good road surface conditions, the
maximum
gradient-climbing
capability is 80%,
which corresponds to an approach/
departure angle of 38°. Note that the
vehicle's gradient-climbing capability
depends on the off-road conditions.
Accelerate carefully and make sure that the
wheels do not spin when driving on steep
terrain.
i If the load on the front axle is reduced
when pulling away on a steep uphill slope,
the front wheels have a tendency to spin.
4ETS detects this and brakes the wheels
accordingly. The rear wheel torque is
increased, making it easier to drive off.
Brow of hill When driving on an uphill gradient, reduce
pressure slightly on the accelerator
immediately
before

reaching the top of the hill
(do not shift the transmission to position N).
Use the vehicle's own impetus to drive over
the top of the hill.
This style of driving prevents:
R the vehicle from lifting off the ground on the
brow of a hill
R loss of traction
R the vehicle from traveling too quickly down
the other side
Driving downhill R
Before tackling steep downhill gradients,
select shift range 1 (Y page 121).
This way you use the engine's braking
effect to reduce the speed. If this is not
sufficient, brake gently. When doing so, make sure that the vehicle is facing in the
direction of the line of fall.
R Observe the notes on driving in
mountainous terrain (Y page 139).
R Drive slowly.
R Do not drive at an angle down steep
inclines. Steer

into the line of fall and drive
with the front wheels aligned straight.
Otherwise, the vehicle could slip sideways,
tip and roll over.
R Check that the brakes are working normally
after a long downhill stretch.
i The special off-road ABS(Y page 54)
enables accurate, brief and repeated
locking of the front wheels, causing them
to dig into the loose ground. Note that when
the front wheels are fully braked, they slide
easily over the surface of the ground,
making it difficult to steer. Driving systems
Cruise control
Important safety notes Cruise control maintains a constant road
speed for you. On long and steep downhill
gradients, especially if the vehicle is laden,
you must select shift range 1, 2 or 3 in good
time. By doing so, you will make use of the
braking effect of the engine, which relieves
the load on the brake system and prevents
the
brakes

from overheating and wearing too
quickly.
Use cruise control only if road and traffic
conditions make it appropriate to maintain a
steady speed for a prolonged period. You can
set any road speed above 20 mph
(30 km/h). G
WARNING
The cruise control is a convenience system
designed to assist the driver during vehicle
operation. The driver is and must always Driving systems
139
Driving and parking
Z

Lights
Display messages Possible causes/consequences and
M Solutions
b
Low-Beam Left
 or 
Low-Beam Right The left or right-hand low-beam headlamp is defective.
X
Visit a qualified specialist workshop. b
AUTO-Light
Inoperative The light sensor is defective. The low-beam headlamps are
switched on.
X
USA only: set the lights to manual operation in the on-board
computer ( Y page 160).
X Switch the lights on and off using the light switch.
X Visit a qualified specialist workshop. b
Turn signal rear
left Back-up bulb
on
  or  

Turn signal
rear right Back-up
bulb on The rear left-hand or rear right-hand turn signal is defective.
Another lamp has taken over its function.
X
Replace the bulb
(
Y page 94). b
Turn signal left
mirror
  or  Turn
signal right

mirror The turn signal in the left-hand or right-hand exterior mirror is
defective.
These
messages will only appear if all of the turn signal's
LEDs have failed.
X Visit a qualified specialist workshop. b
Turn signal front
left Back-up bulb
on

  or
 

Turn signal
front right Back-
up bulb on The front left-hand or front right-hand turn signal is defective.
Another lamp has taken over its function.
X
Replace the bulb
(
Y page 94). b
Brake lamp left
  or
 Brake lamp right The left or right-hand brake lamp is defective.
X
Replace the bulb (
Y page 94). b
High-mounted
brake
lamp The high-mounted brake lamp is faulty. This message will only
appear if all of the brake lamp's LEDs have failed.
X
Visit a qualified specialist workshop.168
Display messages
On-board computer and displays

Display messages Possible causes/consequences and
M Solutions©
TC
Shift
Procedure
Canceled The gear change process was not carried out.
X
Repeat the gearshift process. ©
TC Shift
Conditions Not
Fulfilled One or more conditions to shift the transfer case have not been
fulfilled.
X
Repeat the gearshift process. ©
TC In Neutral The transfer case is in the neutral position.
X
Shifting the transfer case into HIGH or LOW.©
Transfer Case
Service Required There is a malfunction in the transfer case.
X
Do not shift the transfer case.
X Have the vehicle checked as soon as possible at a qualified
specialist workshop. G
WARNING
If the transfer case is in Neutral,
the
park position P of the automatic transmission will not hold
the vehicle. The parking brake must be engaged to hold the vehicle in place. Warning and indicator lamps in the instrument cluster
Seat belts
Problem Possible causes/consequences and
M Solutions7
After starting the
engine, the red seat
belt
warning

lamp lights
up for six seconds. The seat belt warning lamp reminds the driver and front passenger
to fasten their seat belts.
X
Fasten your seat belt ( Y page 41).7
After starting the
engine, the red seat
belt
warning

lamp lights
up. In addition, a
warning tone sounds
for up to six seconds. G
Risk of injury
The driver's seat belt is not fastened.
X Fasten your seat belt ( Y page 41).
The warning tone ceases. 178
Warning and indicator lamps in the instrument cluster
On-board computer and displays

Problem Possible causes/consequences and
M Solutions!
The
yellow
ABS warning
lamp is lit while the
engine is running. G
Risk of accident
ABS (Anti-lock Brake System) is deactivated due to a malfunction.
Therefore, BAS

(Brake Assist), ESP ®
(Electronic Stability Program),
EBD (electronic brake force distribution) and 4ETS are also
deactivated.
The brake system continues to function normally, but without the
functions listed above. The wheels could therefore lock if you
brake hard, for example.
X Observe the additional display messages in the multifunction
display.
X Drive on carefully.
X Visit a qualified specialist workshop.
If the ABS control unit is defective, other systems, such as the
navigation system or the automatic transmission, may also be
unavailable. !
The
yellow

ABS warning
lamp is lit while the
engine is running. G
Risk of accident
The on-board voltage is too low. ABS has been deactivated due to
undervoltage.
ESP ®
, BAS, EBD and 4ETS are therefore also deactivated, for
example.
The brake

system continues to function normally, but without the
functions listed above. The wheels could therefore lock if you
brake hard, for example.
X Observe the additional display messages in the multifunction
display.
X Drive on carefully.
X Switch off consumers that are not required, e.g. the rear window
defroster or interior lighting.
ABS will be available again as soon as the vehicle's on-board
electrical system voltage increases.
If the warning lamp is still on:
X Have the battery and alternator checked at a qualified specialist
workshop. !
The
yellow

ABS warning
lamp is lit while the
engine is running. You have engaged the differential locks. ABS, BAS, EBD, ESP
®
and
4ETS are deactivated.
X Disengage the differential locks.
Subsequently, ABS, BAS, EBD, ESP ®
and 4ETS are reactivated. Warning and indicator lamps in the instrument cluster
181
On-board computer and displays Z