2020 Seat Leon brake

Driving
Advance warning
If the syst em det
ects a possible collision with
the vehicle in front, it alerts the driver by
means of an audible warning and an indica-
tion on the instrument panel display {
››› Fig. 176.
The warning moment varies depending on
the traffic situation and driver behaviour. At
the same time, the vehicle will prepare for a
possible emergency braking ››› in Intro-
duction on page 2 49

.
When Front Assist is connected, the indica-
tions of other functions on the screen may be
hidden.
Critical warning
If the driver fails to react to the advance
warning, the system may actively intervene
in the brakes and generate a brief jolt to warn
the driver of the imminent danger of a colli-
sion.
Automatic braking
If the driver also fails to react to the critical
warning, the system may initiate independ-
ent emergency braking by progressively in-
creasing the braking in accordance with the
criticality of the situation. Driver emergency braking assistance sys-
tem
If the driv

er, after the critical warning, starts
braking but the system detects that the brake
is not being applied with sufficient force, the
braking intensity will be increased. This brake
assist only occurs if the pedal is pressed firm-
ly. WARNING

Driver assistance systems
the side of the vehicle towards which traffic is
appr oaching in tr
ansverse direction 1)
.
Automatic braking to reduce damages
If the rear cross traffic alert detects that
someone else on the road is approaching the
rear of the vehicle and the driver does not
step on the brake, the system will engage the
brakes automatically.
The parking system helps the driver by auto-
matically engaging the brakes to reduce any
damage. The automatic intervention on the
brakes takes place when driving in reverse at
approx. 1-12 km/h (1-7 mph). After detecting
that the vehicle is stationary, the system
keeps it that way for around 2 seconds.
After automatically braking to reduce dam-
age, the system will not be able to automati-
cally brake again for approximately 10 sec-
onds.
You can interrupt the automatic braking by
stepping hard on the accelerator pedal or
the brake pedal in order to regain control of
the vehicle. WARNING
The smart technology incorporated into
the r ear cr

oss traffic alert cannot over- come the limits imposed by the laws of
physics; it only w
orks within the limits of the
syst

em. The parking assistant function
should not tempt you into taking any risks.
The system is not a replacement for driver
awareness.

Braking and parking
harder, as the braking distance increases due
t o the l
ack of assistance from the servo brake. WARNING
Any anomaly in the brake system can in-
cr ease the br

aking distance, with the re-
sulting risk of an accident.

Braking and parking
CAUTION
To prevent the vehicle from unintentionally
mo ving when parking it, first apply the
el
ectronic parking brake and then remove
your foot from the brake pedal. Note

Driving
ignition, the function will remain on the next
time the ignition is s wit
ched on.
If the Auto Hold function was not switched on,
it will automatically remain off next time the
ignition is engaged.
The Auto Hold function connects automat-
ically if the following conditions are met
(all points must be met at the same time
››› ):
The v ehicl

e is kept stationary with the
brake pedal on a flat surface or on a
slope.
The engine rotates “correctly”.
The Auto Hold function is automatically
turned off if the following conditions are
met: If any of the conditions mentioned on
››› page 277, Conditions for keeping
the vehicle stationary with the Au-
to Hold function are no longer met.
If the engine is running irregularly or an
anomaly is detected.
If the engine stalls.
Manual gearbox: The clutch and the ac-
celerator are pressed at the same time.
Automatic gearbox: If the accelerator is
pressed
Automatic gearbox: If any of the tyres
has only minimal contact with the
1.
2.
1.
2.
3.
4.
5. ground, e.g. in the case of axle articula-
tion. WARNING
The smart technology incorporated into
the Aut o Hol

d function cannot defy the
laws of physics; it only works within the lim-
its of the system. The greater convenience
provided by the Auto Hold function should
never tempt you to take any risk that may
compromise safety.

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:

Help with parking and manoeuvring
Parking with the parking assist system Fig. 199
On the instrument panel display: paral-
l el parking.  Finding a parking space
.  Park-
ing position.  Manoeuvring. Fig. 200
On the instrument panel display: angle
parking.  Finding a parking space .  P

arking
position.  Manoeuvring. Message to move forwards
Y
our v

ehicle
Parking space detected
Message to park
Message to press the brake pedal
Progress bar
1 2
3
4
5
6 The necessary conditions have to be met to
park with P
ark Assist
›
›› page 284
and the
parking mode must be selected ››› page 285
.
Parking