2020 Seat Leon Owner's manual

Braking and parking
Brake assist systems Electronic Stability Control (ESC)
The ESC helps t
o impr
ove safety. It reduces
the tendency to skid and improves the stabili-
ty and roadholding of the vehicle. The ESC
detects critical handling situations, such as
vehicle understeer or oversteer, or wheelspin
on the driving wheels. It stabilises the vehicle
by braking individual wheels or by reducing
the engine torque. The warning lamp will
flash on the instrument panel when the ESC is
intervening !.
The ESC includes the anti-lock brake system
(ABS), the hydraulic brake assist (HBA), the
traction control system (TCS), electronic dif-
ferential lock (EDS), electronic torque control
(XDS) and the tractor-trailer sway mitiga-
tion*.
ESC also helps stabilise the vehicle by
changing the torque.
The TCS can be deactivated when wheel
spin is desirable ››› page 281
.
Anti-lock brake system (ABS)
ABS prevents the wheels from locking up un-
der braking until the vehicle has reached a
virtual standstill. You can continue to steer the
vehicle even when the brakes are on full.
Keep your foot on the brake pedal and do not
pump the brakes. You will feel the brake pedal
pulsate while the ABS is working. If the running gear or brake system is modi-
fied, the eff
ectiv

eness of the ABS could be se-
verely limited.
Hydraulic Brake Assist (HBA)
The brake assist system can reduce the re-
quired braking distance. The braking force is
automatically boosted if you press the brake
pedal quickly in an emergency. You must
keep pressing the brake pedal until the dan-
ger has passed.
Traction control (TCS)
In the event of the wheels spinning, the TCS
reduces the engine torque to adapt to the
road condition. This helps the car to start
moving, accelerate or climb a gradient.
Electronic differential lock (EDL)
When the EDL detects wheelspin, it brakes
the spinning wheel and directs the power to
the other driven wheel. This function is active
up to approximately 100 km/h (62 mph).
To prevent the disc brake of the braked wheel
from overheating, the EDL cuts out automati-
cally if subjected to excessive loads. The ve-
hicle can still be driven. The EDL will switch on
again automatically when the brake has
cooled down. Tractor-trailer sway mitigation*
If the vehicl
e 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 303
.
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. »
279

Driving
XDS works in combination with the ESC and is
al w
ays active, even when TCS is switched off,
or when the ESC is in Sport mode or discon-
nected.
Multi-collision brake
The multi-collision brake consists of automat-
ic braking activated by the Airbag control
unit. It is activated when, in the event of an
accident, the Airbag control unit detects de-
celerations above the activation level, and
braking is managed by the ESC system.
In the event of an accident, the multi-collision
brake can help the driver by braking to avoid
the risk of skidding during the accident and
causing other collisions.
The following actions control automatic brak-
ing during the accident:

Braking and parking
risks by the presence of more safety sys-
t
ems. If you do
, an accident may occur.

Driving

Help with parking and manoeuvring
WARNING
The technology used in the park assist sys-
t em inv
olves a series of limitations inherent
in the actual system and in the use of ultra-
sonic sensors. The use of Park Assist should
never tempt you to take any risk that may
compromise safety. The system is not a re-
placement for driver awareness.

Driving

Help with parking and manoeuvring
Trailer mode
The P ark Assist syst
em cannot be switched
on if the factory-fitted towing bracket
››› page 298 is electrically connected to a
trailer.
After changing a wheel
If, after changing a wheel, the vehicle stops
entering and exiting parking spaces correct-
ly, the circumference of the new wheel may
be different and the system may need to
adapt to it. The adaptation is automatic and
takes place during driving. Making turns slow-
ly and in both directions (20 km/h [12 mph])
for a few minutes may contribute to this
adaptation process ››› in Introduction on
page 283.
Selecting a parking type Fig. 197
On the instrument panel display: view
of the parking assist syst em with r

educed view. Fig. 198
On the instrument panel display: indi-
cation of parking modes. Park assist has the following 5 parking types:
Re

verse parallel parking.
Reverse angle parking.
Forward angle parking.
Reverse parallel parking without driving
past first: “Help me”.
Forward parking in a parking bay without
driving past first.
Selecting a parking type after passing in
front of the space
After activating the Park Assist system and af-
ter detecting a parking space, the display on
the instrument panel proposes a parking
type. The Park Assist system selects the park-




 ing type automatically. The selected type is
displayed on the instrument clust

er display
››› Fig. 197 and on the infotainment system
display.

Driving
manoeuvre that has been started, the system
itself will driv e out of the parking space be-
f
ore starting parking in a similar way to type
.
Special case of driving forwards into a
type  parking bay without driving past first