CITROËN DS 5 Handbook page 184

Electronic stability control (ESC)
A set of the following Electronic Stability
systems:
- anti-lock braking system (ABS) and
electronic brake force distribution (EBFD),
- emergency braking assistance,
- wheel anti-slip regulation (ASR) or traction
control,
- dynamic stability control (DSC).
definitions
Anti-lock braking system (ABS)
and electronic brake force
distribution (EBFd)
These systems improve the stability and
manoeuvrability of your vehicle when braking
and contribute towards improved control in
corners, in particular on poor or slippery road
surfaces.
The ABS prevents wheel lock in the event of
emergency braking.
The electronic brake force distribution system
manages the braking pressure wheel by wheel.
Emergency braking
assistance
In an emergency, this system enables you to
reach the optimum braking pressure more
quickly and therefore reduce the stopping
distance.
It is triggered in relation to the speed at which
the brake pedal is pressed. This is felt by a
reduction in the resistance of the pedal and an
increase in the effectiveness of the braking.
Anti-slip regulation (ASR)
This system (also known as Traction Control)
optimises traction in order to avoid wheel
slip by acting on the brakes of the driving
wheels and on the engine. It also improves
the directional stability of the vehicle on
acceleration.
dynamic stability control
(dSc)
If there is a difference between the path
followed by the vehicle and that required by the
driver, this system monitors each wheel and
automatically acts on the brake of one or more
wheels and on the engine to return the vehicle
to the required path, within the limits of the laws
of physics.