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Vehicles with 4MATIC:
®
Because the ESP
operates automatically, the
engine and ignition must be shut off (SmartKey
in starter switch position 0 or 1 or KEYLESS-GO*
start/stop button in position 0 or 1) when test-
ing the parking brake on a brake test dynamom-
eter and such testing should be no longer than
10 seconds.
Active braking action through the ESP
otherwise seriously damage the brake system
which is not covered by the Mercedes-Benz
Limited Warranty.
To help prevent brake disk corrosion after
driving on wet road surfaces (particularly
salted roads), it is advisable to brake the
vehicle with considerable force prior to
parking. The heat generated serves to dry
the brakes.
If your brake system is normally only
subjected to moderate loads, you should
occasionally test the effectiveness of the
brakes by applying above-normal braking
pressure at higher speeds. This will also
enhance the grip of the brake pads.
Warning!
Make sure not to endanger any other road
users when carrying out these braking
maneuvers.
Refer to the description of the Brake Assist
®
may
System (BAS) ( page 101).
Brake pad wear or a leak in the system may
be the reason for low brake fluid level in
the reservoir.
The brake fluid level in the reservoir may
be too low if the brake warning lamp
in the instrument cluster comes on and an
acoustic warning sounds although the
parking brake is released ( page 415).
Observe additional messages in the multi-
function display that may appear
( page 447).
Have the brake system inspected
immediately. Contact an authorized
Mercedes-Benz Light Truck Center.
Driving instructions
All checks and service work on the brake
G
system should be carried out by qualified
technicians only. Contact an authorized
Mercedes-Benz Light Truck Center.
Only install brake pads and brake fluid
recommended by Mercedes-Benz.
Warning!
If other than recommended brake pads are
installed, or other than recommended brake
fluid is 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.
Operation
G
341
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