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Mercedes SBC
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Mercedes Benz employs a system called sensotronic brake control (SBC) for the W211 E, W230 SL,and W219 CLS class variants.
This is a brake by wire system that no longer relies on the driver to produce the hydraulic pressure required to operate theÂ
brakes.
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Sensors on the brake pedal inform the computer how the pedal is pressed, eg how far, how fast etc. The computer will then
dissipate the required force to each wheel.
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The control units have a factory set service life after which an error
 such as:
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CODE C249F,
OPERATING TIME OF COMPONENT A7/3 IS EXCEEDED
(SBC HYDRAULIC UNIT).
C2358 service threshold reached
ABS defective
ESP defective
STOP Brakes Defective
is displayed
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Please see Pics
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In many cases this simply means that the number of preset brake pedal presses has been exceeded and the unit needs replacing
at a cost of £1000+, regardless of its operating condition, However it is now possible to reset the existing unit forÂ
considerably less than the price of replacement.