Sensotronic Brake Control (SBC™) works electronically, and thus
faster and more precisely, than a conventional hydraulic braking system. As soon as you press the brake pedal
and the sensors identify the driving situation in hand, the computer makes an exact calculation of the brake
force necessary and distributes it between the wheels as required. This allows SBC™ to critically reduce
stopping distances. SBC™ also helps to optimise safety functions such as ESP®, ASR, ABS and
With Sensotronic Brake Control, electric impulses are used to
pass the driver's braking commands onto a microcomputer which processes various sensor signals simultaneously
and, depending on the particular driving situation, calculates the optimum brake pressure for each wheel. As a
result, SBC offers even greater active safety than conventional brake systems when braking in a corner or on a
A high-pressure reservoir and electronically controllable
valves ensure that maximum brake pressure is available much sooner. Moreover, the system offers innovative
additional functions to reduce the driver's workload. These include Traffic Jam Assist, which brakes the
vehicle automatically in stop-and-go traffic once the driver takes his or her foot off the accelerator. The
Soft-Stop function - another first - allows particularly soft and smooth stopping in town
When drivers hit the brake pedal today, their foot moves a
piston rod which is linked to the brake booster and the master brake cylinder. Depending on the pedal force,
the master brake cylinder builds up the appropriate amount of pressure in the brake lines which - in a tried
and tested interaction of mechanics and hydraulics - then presses the brake pads against the brake discs via
the wheel cylinders.
By contrast, in the Mercedes-Benz Sensotronic Brake Control, a
large number of mechanical components are simply replaced by electronics. The brake booster will not be needed
in future either. Instead sensors gauge the pressure inside the master brake cylinder as well as the speed with
which the brake pedal is operated, and pass these data to the SBC computer in the form of electric impulses. To
provide the driver with the familiar brake feel, engineers have developed a special simulator which is linked
to the tandem master cylinder and which moves the pedal using spring force and hydraulics.
In other words: during braking, the actuation unit is completely disconnected
from the rest of the system and serves the sole purpose of recording any given brake command. Only in the event
of a major fault or power failure does SBC automatically use the services of the tandem master cylinder and
instantly establishes a direct hydraulic link between the brake pedal and the front wheel brakes in order to
decelerate the car safely.
The central control unit under the bonnet is the centrepiece of
the electrohydraulic brake. This is where the interdisciplinary interaction of mechanics and electronics
provides its greatest benefits - the microcomputer, software, sensors, valves and electric pump work together
and allow totally novel, highly dynamic brake management:
In addition to the data relating to the brake pedal actuation, the SBC computer
also receives the sensor signals from the other electronic assistance systems.
For example, the anti-lock braking system (ABS) provides
information about wheel speed, while Electronic Stability Program (ESP®) makes available the data from its
steering angle, turning rate and transverse acceleration sensors. The transmission control unit finally uses
the data highway to communicate the current driving range. The result of these highly complex calculations is
rapid brake commands which ensure optimum deceleration and driving stability as appropriate to the particular
driving scenario. What makes the system even more sophisticated is the fact that SBC calculates the brake force
separately for each wheel.
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Call (310) 441-1956 For A Free Diagnostic.