Mercedes Benz 2009 M-Class User Manual

The high-performance brake system is de-
signed to operate under the extremely high 
operating demands required to accommo-
date the performance capabilities of the 
vehicle. The brakes may produce a squeak-
ing-type noise depending on the

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vehicle speed

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brake force applied

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ambient conditions, e.g. temperature 
and humidity

As with any brake system, the wear of indi-
vidual brake system components such as 
brake pads or disks strongly depends on 
your driving style and the conditions under 
which you operate the vehicle. Thus, a driv-
ing style calling for high demand braking 
will cause your vehicle’s brakes to wear 
more quickly.

When driving on wet roads or dirt covered 
surfaces, road salt and/or dirt can get into 
the parking brake. To prevent corrosion 
and a reduction in the braking power of the 
parking brake, observe the following:

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From time to time, lightly engage the 
parking brake before driving off.

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Drive a distance of approximately 
110 yds (100 m) at a maximum speed 
of 12 mph (20 km/h).

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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 mes-

sages in the multifunction display. Especial-

ly for high performance driving, it is 

important to maintain and have the brake 

system checked regularly.

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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.