Mercedes-Benz 2008 M-Class Operator's Manual page 402

Problem
-
The yellow ABS indicator lamp comes on while
the engine is running.
;
(USA only) The red brake warning lamp
comes on while driving and an
3
(Canada only)
acoustic warning sounds.
Warning!
Driving with the brake warning lamp illumi-
nated can result in an accident. Have your
brake system checked immediately if the
brake warning lamp stays on.
Possible cause/conse-
quence
The self-diagnosis has not yet
been completed yet.
You are driving with the
parking brake set.
There is insufficient brake fluid
in the reservoir.
G
Do not add brake fluid before checking the
brake system. Overfilling the brake fluid res-
ervoir can result in spilling brake fluid on hot
engine parts and the brake fluid catching
fire. You can be seriously burned.
Practical hints
What to do if ...
Suggested solution
The display will clear after driving a short
distance at a vehicle speed of above
12 mph (20 km/h).
Release the parking brake
( page 57).
Risk of accident! Carefully stop the
vehicle in a safe location or as soon as
it is safe to do so.
Apply the parking brake ( page 65).
Contact an authorized
Mercedes-Benz Light Truck Center.
Do not add brake fluid! This will not
solve the problem.
!
If you find that the brake fluid in the brake
fluid reservoir has fallen to the minimum mark or
below, have the brake system checked for brake
pad thickness and leaks.
401