BMW 3 (E46). Manual — part 121
300-2
Electronic Brake and
Stability Control
Systems
All E46 vehicles are equipped with an
Antilock Braking System (ABS). Early
production models featured ABS with
Automatic Stability Control (ABS/ASC).
Later models came equipped with ABS
and Dynamic Stability Control
(ABS/DSC). DSC builds upon the
existing ABS/ASC system to provide
electronic control of drive and braking
systems to insure vehicle stability.
This manual will refer to these systems
as ABS. ASC or DSC will be specified
when necessary. See the
accompanying illustrations for
individual system identification.
E46 Electronic braking and
stability control systems
ASC
1999 - 2000 Automatic Stability Control
Teves MK 20 ASC
1 - Brake master cylinder and fluid
reservoir, left rear of engine
compartment
2 - ASC control module and hydraulic
unit, left rear of engine
compartment under master
cylinder
3 - Rear wheel speed sensor, at each
rear wheel hub
4 - Front wheel speed sensor, at each
front steering arm
DSC
1999 - 2000 Dynamic Stability Control
Teves MK 20 DSC
1 - DSC control module and hydraulic
unit, right rear of engine
compartment
2 - Brake fluid reservoir, master
cylinder and DSC brake pressure
sensors, left rear of engine
compartment
3 - DSC precharge pump, left rear of
engine compartment, under brake
master cylinder
4 - Rear wheel speed sensor, at each
rear wheel hub
5 - Front wheel speed sensor, at each
front steering arm
6 - Steering angle sensor, at base of
upper steering column
7 - Lateral acceleration sensor,
behind driver’s kickpanel
8 - Rotational acceleration (yaw)
sensor, under driver’s seat,
underneath rug
2001 rear wheel drive Dynamic Stability
Control Teves MK 60 DSC
1 - Brake fluid reservoir and master
cylinder, left rear of engine
compartment
2 - DSC control module and hydraulic
unit, left rear of engine
compartment, under brake master
cylinder
3 - Rear wheel speed sensor, at each
rear wheel hub
4 - Front wheel speed sensor, at each
front steering arm
5 - Steering angle sensor, at base of
upper steering column
6 - Lateral acceleration sensor,
behind driver’s kickpanel
7 - Rotational acceleration (yaw)
sensor, under driver’s seat,
underneath rug
Note:
There is no precharge pump in this
system.
2001 all wheel drive Dynamic Stability
Control Bosch DSC III 5.7
1 - DSC control module, hydraulic
unit and DSC brake pressure
sensor, right rear of engine
compartment
2 - Brake fluid reservoir and master
cylinder, left rear of engine
compartment
3 - DSC precharge pump, left rear of
engine compartment, under brake
master cylinder
4 - Rear wheel speed sensor, at each
rear wheel hub
5 - Front wheel speed sensor, at each
front steering arm
6 - Steering angle sensor, at base of
upper steering column
7 - Lateral acceleration sensor and
rotational acceleration (yaw)
sensor, under driver’s seat,
underneath rug
ABS system description
The electronically controlled ABS
maintains vehicle stability and control
during emergency braking by
preventing wheel lock-up. ABS
provides optimum deceleration and
stability during adverse conditions. It
automatically adjusts brake system
hydraulic pressure at each wheel to
prevent wheel lock-up.
The system's main components are the
wheel speed (pulse) sensors, the
ABS/ASC or ABS/DSC control module,
and the hydraulic control unit.
The wheel speed sensors continuously
send wheel speed signals to the
control module. The control module
compares these signals to determine,
in fractions of a second, whether any of
the wheels are about to lock. If any
wheel is nearing a lock-up condition,
the module signals the hydraulic unit to
maintain or reduce pressure at the
appropriate wheel(s). Pressure is
modulated by electrically-operated
solenoid valves in the hydraulic unit.
Automatic Stability Control
(ASC)
The Automatic Stability Control (ASC)
system works in conjunction with the
Antilock Brake System (ABS) and the
engine management system to
enhance vehicle control. The main
function of the ASC system is to
maintain the rolling contact between
the tires and the road surface under all
driving conditions. This is achieved
through exact application and
management of braking and drivetrain
forces.
Note:
The traction control system referred to
as ASC (Automatic Stability Control)
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