Seat Leon Owner's Manual page 260

Tractor-trailer sway mitigation*
If the vehicle is pulling a trailer, it will control
the following: tractor-trailers tend to sway.
When the swaying of the trailer is felt by the
vehicle and detected by the ESC, it will auto-
matically brake the towing vehicle within the
limits of the system and mitigate the sway.
Tractor-trailer sway mitigation is not available
›››
in all countries page
Electronic engine torque management
(XDS)
When taking a curve, the driveshaft differen-
tial allows the outer wheel to turn at a higher
speed than the inner wheel. In this way, the
wheel that is turning faster (outer wheel) re-
ceives less drive torque than the inner wheel.
This may mean that in certain situations the
torque delivered to the inner wheel is too
high, causing the wheels to spin. On the other
hand, the outer wheel is receiving a lower
drive torque than it could transmit. This can
cause a loss of grip on the drive axle, in this
case the front axle, which results in under-
steer or "lengthening" of the trajectory.
The XDS can detect and correct this effect
via the sensors and signals of the ESC.
Via the ESC, the XDS will brake the inside
wheel and counter the excess driving torque
of that wheel. This means that the requested
trajectory is much more precise.
258
XDS works in combination with the ESC and is
always active, even when TCS is disconnec-
ted, or when the ESC is in Sport mode or dis-
connected.
Multi-collision brake
In an accident, the multi-collision brake can
help the driver by braking to avoid the risk of
281.
skidding during the accident and causing
other collisions.
The multi-collision brake works for front, side
or rear accidents, when the airbag control
unit records its activation level and the acci-
dent takes place at a speed of over 10 km/h
(6 mph). The ESC automatically brakes the
vehicle, as long as the accident has not dam-
aged the ESC, the brake hydraulics or the on-
board network
The following actions control automatic brak-
ing during the accident:
When the driver presses the accelerator,
●
the automatic braking does not take place.
When the braking pressure through press-
●
ing the brake pedal is greater than the sys-
tem's braking pressure the vehicle will brake
automatically.
Multi-collision braking will not be available
●
if ESC is malfunctioning.
Driving
Electromechanical brake servo (eBKV)
With the ignition switched on, the electrome-
chanical brake servo supports the force of
the foot by increasing the pressure that the
driver exerts on the brake pedal. After discon-
necting the ignition, the assistance of the
brake servo is progressively reduced. Once
stopped, immobilise the vehicle to prevent it
from moving.
If the electromechanical brake servo does
not work, the red symbol
in the brake system appears in the instrument
panel. When braking with the faulty electro-
mechanical brake servo, vibration of the
brake pedal may occur.
If the electromechanical brake servo is not
working, the brake pedal must be pressed
harder, as the braking distance increases due
to the lack of assistance from the servo brake.
indicating failure

WARNING
Driving at high speed on icy, slippery wet
ground can result in loss of vehicle control
and serious injury to the driver and passen-
gers.
The ESC, ABS, TCS, EDS and the electron-
●
ic torque control systems cannot exceed
the limits imposed by the laws of physics.
Always bear this in mind, especially on wet
or slippery roads. If you notice the systems
cutting in, you should reduce your speed
immediately to suit the road and traffic
conditions. Do not be encouraged to take