On the abs warning lamp, Brakes, On-board computer and displays – Mercedes-Benz 2013 M Class User Manual
Page 320
Safety systems
Problem
Possible causes/consequences and M Solutions
$ (USA only)
J (Canada only)
The red brake system
warning lamp comes on
while the engine is
running. A warning tone
also sounds.
G
WARNING
The brake boosting effect is malfunctioning and the braking
characteristics may be affected.
There is a risk of an accident.
X
Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions. Do not continue driving
under any circumstances.
X
Secure the vehicle against rolling away (
X
Consult a qualified specialist workshop.
X
Observe the additional display messages in the multifunction
display.
$ (USA only)
J (Canada only)
The red brake system
warning lamp comes on
while the engine is
running. A warning tone
also sounds.
There is not enough brake fluid in the brake fluid reservoir.
G
WARNING
The braking effect may be impaired.
There is a risk of an accident.
X
Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions. Do not continue driving
under any circumstances.
X
Secure the vehicle against rolling away (
X
Do not add brake fluid. Adding more will not remedy the
malfunction.
X
Consult a qualified specialist workshop.
X
Observe the additional display messages in the multifunction
display.
318
Warning and indicator lamps in the instrument cluster
On-board computer and displays