Mercedes-Benz GLK 300 4MATIC 2012 Owner's Manual page 179

Driving systems
176
SPEEDTRONIC
Important safety notes
G
WARNING
Never depress the brake pedal continuously
while the vehicle is in motion, e.g. never cause
the brakes to rub by applying constant slight
pedal pressure. This causes the brake system
to overheat, increases the braking distance
and can lead to the brakes failing completely.
G
WARNING
Do not change down for additional engine
braking on a slippery road surface. This could
cause the drive wheels to lose their grip and
the vehicle could skid.
G
WARNING
SPEEDTRONIC is only an aid designed to
assist driving. You are responsible for the
vehicle's speed and for braking in good time.
SPEEDTRONIC brakes automatically so that
you do not exceed the set speed. On long and
steep downhill gradients, especially if the
vehicle is laden or towing a trailer, you must
shift to a lower gear in good time or select
shift range 1, 2 or 3 on vehicles with auto-
matic transmission. By doing so, you will
make use of the braking effect of the engine.
This relieves the load on the brake system and
prevents the brakes from overheating and
wearing too quickly. If you need additional
braking, depress the brake pedal repeatedly
rather than continuously.
You can set a variable or permanent limit
speed:
variable for speed limits, e.g. in built-up
R
areas
permanent for long-term speed restric-
R
tions, e.g. when driving with winter tyres
fitted ( page 178)
Y
i
The speed indicated in the speedometer
may differ slightly from the limit speed
stored.
Variable SPEEDTRONIC
General notes
With the cruise control lever, you can operate
cruise control or DISTRONIC PLUS and vari-
able SPEEDTRONIC.
The LIM indicator lamp on the cruise control
lever indicates which system you have selec-
ted:
LIM indicator lamp off: cruise control or
R
DISTRONIC PLUS is selected.
LIM indicator lamp on: variable SPEED-
R
TRONIC is selected.
You can use the cruise control lever to limit
the speed to any speed above 30 km/h while
the engine is running.
To store the current speed or a higher
:
speed
LIM indicator lamp
;
To store the current speed and call up the
=
last stored speed
To store the current speed or a lower
?
speed
To switch between cruise control and var-
A
iable SPEEDTRONIC
To deactivate variable SPEEDTRONIC
B
Selecting variable SPEEDTRONIC
Check whether LIM indicator lamp ; is on.
X
If it is on, variable SPEEDTRONIC is already
selected.