B340714

10/19/23, 9:25 AM
34 07 14_Carbon Ceramic Brake Noise
SIB 34 07 14
Carbon Ceramic Brake Noise
2023-10-13
This Service Information Bulletin (Revision 3) replaces SI B34 07 14 dated January 2015.
What’s New (Specific text highlighted):
Model: All with carbon ceramic brake option 2NK
☐
THIS REPAIR IS MOBILE FRIENDLY
MODEL
E-Series
ALL
Model Description
Motorsport “M”
Affected Option Code
SA2NK M Carbon Ceramic Brake
SITUATION
Functional noises (squealing/honking) when braking shortly before the vehicle comes to a stop.
CAUSE
Material-specific properties of the brake components
INFORMATION
“M” vehicles are designed for high-performance, spirited driving. To accommodate this type of driving profile,
a braking system which exceeds the standards for handling heavy brake forces, extreme temperatures, and
excellent stopping power at high speeds is required. “M” vehicles can be ordered with the optional ultra-high
performance braking system, featuring perforated carbon ceramic brake discs designed for circumstances
similar to those encountered on racetracks. The carbon ceramic brakes were designed to improve braking
efficiency, and dramatically increase braking performance along with a significant reduction in weight. When
developing the carbon ceramic brake system, the main focus was on braking performance for the sportyminded driver, while accepting the comfort limitations of functional noises at slower speeds and when
coming to a stop.
Please inform the customer that the carbon ceramic brake systems functional noises (squealing/honking),
are a known characteristic for this type of material, and are only a small trade-off for the improved braking
performance. These functional noises have no effect on the performance, operational reliability and
durability of the brakes.
Part replacement will not provide a remedy for the noise; this is a known characteristic of the highperformance brake system.
More information on the performance and operation of these brakes can be found in the Owner’s Manual
under “M carbon ceramic brake.”
CLAIM INFORMATION
Not applicable
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34 07 14_Carbon Ceramic Brake Noise
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