brakes Citroen JUMPER 2008 2.G Owner's Manual

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Starting and stopping
Hill start assistance
This function, linked with the ESP, makes
starting on a hill easier and is activated in
the following conditions:
- the vehicle must be stationary, with the engine running,
- the gradient of the road must be greater than 5 %, With the brake pedal pressed and the clutch
pedal pressed, when you release the brake
pedal you have approximately 2 seconds
without rolling back and without using the
handbrake within which to move off.
During the moving off phase, the function
is deactivated automatically with gradual
reduction of the braking pressure.
During this phase, a typical noise of
mechanical releasing of the brakes may be
heard, signalling the imminent movement of
the vehicle.

102
Driving safety
TRACTION CONTROL (ASR) AND DYNAMIC STABILITY CONTROL (ESP)
These systems are linked and complement
the ABS.
The ASR system is very useful for
maintaining optimum drive and avoiding
losses of control of the vehicle on
acceleration.
The system optimises drive to prevent the
wheels skidding, by acting on the brakes of
the drive wheels and on the engine. It also
allows the directional stability of the vehicle
to be improved on acceleration.
Use the ESP to hold your course without
attempting to countersteer. If there is a variation between the trajectory
followed by the vehicle and that required
by the driver, the ESP system automatically
acts on the engine and the brake of one
or more wheels, in order to put the vehicle
back on course.
In certain exceptional conditions (when
starting a vehicle stuck in mud or snow, or
on loose ground...), it could prove useful to
disarm the ASR system to make the wheels
spin and regain grip.
Operation of the ASR and ESP
systems The luminous diode flashes when
the ASR or ESP is triggered. Press this button.
The diode on the button comes on: the
ASR system no longer acts on the engine
operation, but continues to act on the brakes.
MALFUNCTION
When a malfunction of the ASR
system occurs, this warning light
comes on, accompanied by an
audible signal and confirmed by a
message on the display.

117
6
ACCESSORIES
Towing a trailer

Cooling: towing a trailer on a slope
increases the coolant temperature.
As the fan is electrically controlled, its
cooling capacity is not dependent on the
engine speed.
On the contrary, use a high gear to lower the
engine speed and reduce your speed.
In all cases, pay attention to the coolant
temperature.
Tyres: check the tyre pressures of the
towing vehicle (see the "Identification
features" section of chapter 9) and of
the trailer, observing the recommended
pressure.
Towbar
We recommend the use of original
CITROËN towbars and their harnesses,
which have been tested and approved from
the design stage of your vehicle and that
the fitting of this equipment is entrusted to a
CITROËN dealer.
If this equipment is not fitted by a
CITROËN dealer, it is imperative that it is
fitted using the electrical pre-equipment
installed at the rear of the vehicle and
in accordance with the manufacturer ’s
instructions.
Good practice
In certain cases of particularly arduous
use (towing the maximum load up a steep
slope in high temperatures), the engine
automatically limits its power. In this
case, the automatic cutting off of the air
conditioning allows the engine power to be
recovered.
If the coolant temperature
warning light comes on, stop the
vehicle and switch off the engine
as soon as possible.
See the "Levels" section of chapter 7.
Brakes: towing increases the braking
distance. Drive at a moderate speed,
change down early and brake gradually.

Side wind: sensitivity to side wind is
increased. Drive smoothly and at a
moderate speed.

ABS: the system only controls the vehicle,
not the trailer.

Rear parking assistance: the assistance
does not function while the vehicle is towing.