CORNER BRAKING CONTROL (CBC)
Corner Braking Control (CBC) was an additional feature first added to the ASC/5 system of
the E39 at introduction. CBC improves stability control while braking through curves.
As the vehicle enters a curve, the weight of the car shifts to the outside of the curve. With
non CBC equipped vehicles if the driver brakes while driving through a curve an equal
hydraulic force is applied to each wheel. Though the pressure is equal, the braking effort
is unequal at the tire footprint due to the increased weight of the vehicle on the outside
curve.
With a CBC equipped sys-
tem, the feature regulates
the apply pressure to the
wheels based on the turn-
ing angle (curve recogni-
tion). When the driver
brakes in the same situa-
tion, an unequal hydraulic
pressure is applied to each
side of the vehicle.
Though the apply pressure
is unequal, the dynamic of
the vehicle’s weigh transfer
compensates for the
unequal apply pressure, as
a result braking effort is
equal at the tire footprint.
The ASC control module
monitors the speed signals
from all four wheels to
determine when this regu-
lation is required.
This is a feature found on
vehicles equipped with the
Dynamic Stability Control
System (DSC), however
this ASC/5 system does
not incorporate full DSC
control.
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