BMW 3 (E46). Manual — part 124
When DBC function is activated, braking
pressure will increase at all wheels up to
the ABS regulation point. DBC will
continue until the driver releases the
brake pedal, brake pressure drops, or
the vehicle slows to under 3 mph.
Maximum brake control (MBC)
Maximum brake control is designed to
assist in stability control by increasing
rear brake pressure when the front
wheels are under ABS regulation. MBC
intervention is triggered when the brakes
are applied too slowly to reach DBC
threshold.
MBC triggering conditions:
Both front wheels in ABS regulation
Vehicle speed above 3 mph
DBC and pressure sensor self test
completed and OK
Vehicle travelling forward
Rear wheels not under ABS
regulation
MBC will activate the return pump to
increase rear wheel pressure build up.
The function will be terminated under
the following conditions:
Front wheels drop out of ABS
regulation
Driver releases brake pedal
Brake pressure falls below
threshold
Vehicle road speed drops below 3
mph
Teves MK 20 ASC diagram
Teves MK 20 DSC Diagram
Vehicle network
The hydraulic unit/control module
communicates with some sensors and
many other control modules over the
CAN-bus. The CAN-bus is a system of
wiring that functions like a computer
network, allowing different components
to communicate over the same data line,
at the same time, by varying electronic
signals.
Component communication dialogs take
place between multiple control units and
sensors over the CAN-bus:
Engine control module (ECM)
provides current engine torque to
ABS control module.
ABS control module provides wheel
speed sensor signals (vehicle
speed) to other modules
ABS control module signals ECM to
increase/reduce torque, ECM
adjusts motor driven throttle
(MDK/EDK)
ABS control module commands
transmission control module (AGS)
to suppress shifts during ASC/DSC
regulation
DSC receives yaw, lateral
acceleration & steering angle
sensor information
ABS control module receives signal
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