brake HYUNDAI SONATA 2023 Service Manual

While Driving
6-18
Good Driving Practices
• Never shift the gear from P (Park) or
N (Neutral) to any other position with
the accelerator pedal depressed.
• Never shift the gear into P (Park) when
the vehicle is in motion.
Be sure the vehicle is completely
stopped before you attempt to shift
into R (Reverse) or D (Drive).
• Do not shift the gear to N (Neutral)
when driving. Doing so may result
in an accident because of a loss of
engine braking and the transmission could be damaged.
• While driving up or downhill, check
the gear position, indicated on the
cluster, to ensure the vehicle is
driving forward while in D (Drive), or
backward while in R (Reverse). If you
drive in the opposite direction of the
selected gear, the engine will turn off
and a serious accident may occur due
to the degraded brake performance.
• Do not drive with your foot resting
on the brake pedal. Even light, but
consistent pedal pressure can result
in the brakes overheating, brake wear
and possibly even brake failure.
• When driving in the manual shift
mode, slow down before shifting to a
lower gear. Otherwise, the lower gear
may not be engaged if the engine
rpms are outside of the allowable
range.
• Always apply the parking brake when
leaving the vehicle. Do not depend on
placing the transmission in P (Park) to
keep the vehicle from moving.
• Exercise extreme caution when
driving on a slippery surface. Be
especially careful when braking,
accelerating or shifting gears. On a
slippery surface, an abrupt change
in vehicle speed can cause the drive
wheels to lose traction and may cause
loss of vehicle control resulting in an
accident •
Optimum vehicle performance and
economy is obtained by smoothly
depressing and releasing the
accelerator.
WARNING
To reduce the risk of SERIOUS INJURY
or DEATH: • ALWAYS wear your seatbelt. In a
collision, an unbelted occupant
is significantly more likely to be
seriously injured or killed than a
properly belted occupant.
• Avoid high speeds when cornering or turning.
• Do not make quick steering wheel
movements, such as sharp lane
changes or fast, sharp turns.
• The risk of rollover is greatly
increased if you lose control of your
vehicle at highway speeds.
• Loss of control often occurs if two or
more wheels drop off the roadway
and the driver over steers to reenter
the roadway.
• In the event your vehicle leaves
the roadway, do not steer sharply.
Instead, slow down before pulling
back into the travel lanes.
• HYUNDAI recommends you follow all
posted speed limits.
Information
Kickdown Mechanism (if equipped)
If you depress the accelerator pedal equipped with Kickdown device beyond
the pressure point, it maximizes the engine
power. You may feel when the Kickdown
equipment starts to work and hear the sound of Kickdown operation. It is normal
operation, not a failure.

06
6-21
•
The dual clutch transmission can be
thought of as an automatically shifting
manual transmission. It gives the
driving feel of a manual transmission,
yet provides the ease of a fully
automatic transmission.
• When D (Drive) is selected, the
transmission will automatically
shift through the gears similar to a
conventional automatic transmission.
Unlike a traditional automatic
transmission, the gear shifting can
sometimes be felt and heard as the
actuators engage the clutches and the
gears are selected.
• The dual clutch transmission
incorporates a wet-type dual clutch
mechanism, which allows for better
acceleration performance and
increased fuel efficiency while driving.
But it differs from a conventional
automatic transmission because
it does not incorporate a torque
converter. Instead, the transition from
one gear to the next is managed by
clutch slip, especially at lower speeds.
As a result, shifts are sometimes more
noticeable, and a light vibration can
be felt as the transmission shaft speed
is matched with the engine shaft
speed. This is a normal condition of
the dual clutch transmission.
• The wet-type clutch transfers torque
more directly and provides a direct-
drive feeling which may feel different
from a conventional automatic
transmission. This may be more
noticeable when launching the vehicle
from a stop or when traveling at low,
stop-and-go vehicle speeds. •
When rapidly accelerating from a
lower vehicle speed, the engine
rpm may increase dramatically as a
result of clutch slip as the dual clutch
transmission selects the correct gear. This is a normal condition.
• When accelerating from a stop on
an incline, press the accelerator
smoothly and gradually to avoid any
shudder feeling or jerkiness.
• When traveling at a lower vehicle
speed, if you release the accelerator
pedal quickly, you may feel engine
braking before the transmission
changes gears. This engine braking
feeling is similar to operating a
manual transmission at low speed.
• When driving downhill, you may wish
to move the gear shift lever/button to
Manual Shift mode and downshift to
a lower gear in order to control your
speed without using the brake pedal
excessively.
• When you turn the engine on and off,
you may hear clicking sounds as the
system goes through a self-test. This
is a normal sound for the dual clutch
transmission.
• During the first 1,500 km (1000 miles),
you may feel that the vehicle may not
be smooth when accelerating at low
speed. During this break-in period, the
shift quality and performance of your
new vehicle is continuously optimized.

While Driving
6-22
WARNING
To reduce the risk of serious injury or
death: • ALWAYS check the surrounding
areas near your vehicle for people,
especially children, before shifting a
vehicle into D (Drive) or R (Reverse).
• Before leaving the driver’s seat,
always make sure the shift lever/
button is in the P (Park) position,
then set the parking brake, and place
the ignition switch in the LOCK/OFF
position. Unexpected and sudden
vehicle movement can occur if these
precautions are not followed.
• Do not use aggressive engine braking
(shifting from a higher gear to a
lower gear) on slippery roads. This
could cause the tires to slip and may
result in an accident.
NOTICE
• Always come to a complete stop
before shifting into D (Drive) or R
(Reverse).
• Do not put the shift lever/button in N
(Neutral) while driving.
WARNING
Due to transmission failure, you may
not continue to drive and the position
indicator and the position indicator (D,
P) on the instrument cluster will blink.
We recommend that you contact an
authorized HYUNDAI dealer and have
the system checked. DCT warning messages
This warning message is displayed when
vehicle is driven slowly on a grade and
the vehicle detects that the brake pedal
is not applied.
OOSH069010L
Steep grade! Press brake pedal
Driving up hills or on steep grades: •
To hold the vehicle on an incline use
the foot brake or the parking brake.
• When in stop-and-go traffic on an
incline, allow a gap to form ahead
of you before moving the vehicle
forward. Then hold the vehicle on the
incline with the foot brake.
• If the vehicle is held or creeping
forward on an incline by applying
the accelerator pedal, the clutch and
transmission may overheat which
can result in damage. At this time, a
warning message will appear on the
LCD display.
• If the LCD warning is active, the foot
brake must be applied.
• Ignoring the warnings can lead to
damage to the transmission.

06
6-23
OOSH069012L
Transmission high temperature
• Under certain conditions, such as
repeated stop-and-go launches
on steep grades, sudden take off
or acceleration, or other harsh
driving conditions, the transmission
clutch temperatures will increase
excessively.
• When the clutch temperatures are too
high, the “Transmission temp. is high!
Stop safely” warning message will
appear on the LCD display, a chime
will sound, and the transmission
shifting may not be smooth.
• If this occurs, pull over to a safe
location, stop the vehicle with the
engine running, apply the brakes and
shift the vehicle to P (Park), and allow
the transmission to cool.
• If you ignore this warning, the driving
condition may become worse.
You may experience abrupt shifts,
frequent shifts, or jerkiness.
• When the message “Trans cooled.
Resume driving.” appears you can
continue to drive your vehicle.
• When possible, drive the vehicle
smoothly.
„„Type A „„Type B
OOSH069007LOOSH069013L
OOSH069014L
Transmission overheated
• If the vehicle continues to be driven
and the clutch temperatures reach
the maximum temperature limit, the
“Transmission Hot! Park with engine
on” warning will be displayed. When
this occurs the clutch is disabled
until the clutch cools to normal
temperatures.
• The warning will display a time to wait
for the transmission to cool.
• If this occurs, pull over to a safe
location, stop the vehicle with the
engine running, apply the brakes and
shift the vehicle to P (Park), and allow
the transmission to cool.

While Driving
6-24
•
When the message “Trans cooled.
Resume driving.” appears you can
continue to drive your vehicle.
• When possible, drive the vehicle
smoothly.
If any of the warning messages in the
LCD display continue to blink, for your
safety, we recommend that you contact
an authorized HYUNDAI dealer and have
the system checked.
Transmission ranges
The indicator in the instrument cluster
displays the shift lever⁄button position
when the ignition switch is in the ON position.
P (Park)
Always come to a complete stop before
shifting into P (Park).
To shift from P (Park), you must depress
firmly on the brake pedal and make sure
your foot is off the accelerator pedal.
The shift lever/button must be in P (Park)
before turning the engine off.
WARNING
• Shifting into P (Park) while the
vehicle is in motion may cause you to
lose control of the vehicle.
• After the vehicle has stopped, always
make sure the shift lever/button is in
P (Park), apply the parking brake, and
turn the engine off.
• When parking on an incline, place
the shift lever/button in P (Park) and
apply the parking brake to prevent
the vehicle from rolling downhill.
• For safety, always engage the
parking brake with the shift lever/
button in the P (Park) position except
for the case of emergency parking.
R (Reverse)
Use this position to drive the vehicle
backward.
NOTICE
Always come to a complete stop before
shifting into or out of R (Reverse); you
may damage the transmission if you
shift into R (Reverse) while the vehicle is
in motion.
When the vehicle is stopped in
R (Reverse) position, if you open
the driver’s door with the seat belt
unfastened, the gear is shifted to P (Park)
position automatically.
However when the vehicle moves
in R (Reverse) position, if you open
the driver’s door with the seat belt
unfastened, the gear may be not shifted
to P (Park) position automatically for
protecting the dual clutch transmission.
N (Neutral)
The wheels and transmission are not engaged.
Use N (Neutral) if you need to restart a
stalled engine, or if it is necessary to stop
with the engine ON. Shift into P (Park)
if you need to leave your vehicle for any
reason.
Always depress the brake pedal when
you are shifting from N (Neutral) to
another gear.

06
6-25
WARNING
Do not shift into gear unless your foot is
firmly on the brake pedal. Shifting into
gear when the engine is running at high
speed can cause the vehicle to move
very rapidly. You could lose control of
the vehicle and hit people or objects.
To stay in N (Neutral) when vehicle is
OFF (button type)
ODN8069006
„„Type A
ODN8069007
„„Type B
ODN8069008
If you want to stay in N (Neutral) after the
engine is OFF (in the ACC state), do the
following.
1. Turn off Auto Hold and release Electronic Parking Brake when the engine is running.
2. Push the N(Neutral) button by depressing the brake pedal. If the
message (“Press and hold the OK
button on the steering wheel to stay in
Neutral ”) appears on the cluster LCD
display, press and hold the OK button
on the steering wheel for more than 1 second.
3. When the message ‘Vehicle will stay in (N). Change gear to cancel’ (or ‘N will
stay engaged when the vehicle is Off’)
will appear on the cluster LCD display,
press the Engine Start/Stop button
while depressing the brake pedal.
However, if you open the driver's
door, the gear will automatically
shift to P (Park) and the Engine Start/
Stop button will change to the OFF position.
NOTICE
With the gear in N (Neutral) the Engine
Start/Stop button will be in the ACC
position. Note that the doors cannot
be locked in the ACC position or the
battery may discharge if left in the ACC
position for a long period.

While Driving
6-26
D (Drive)
This is the normal driving position. The
transmission will automatically shift
through a 8-gear sequence, providing
the best fuel economy and power.
To start the vehicle forward, push the D
(Drive) button by depressing the brake
pedal with the engine ON. Then depress
the accelerator pedal smoothly. For extra
power when passing another vehicle or
driving uphill, depress the accelerator
fully. The transmission will automatically
downshift to the next lower gear (or
gears, as appropriate). When the vehicle
is stopped in D (Drive) position, if you
open the driver’s door with the seat belt
unfastened, the gear is shifted to P (Park)
position automatically.
However when the vehicle moves in D
(Drive) position, if you open the driver’s
door with the seat belt unfastened,
the gear may be not shifted to P (Park)
position automatically for protecting the
dual clutch transmission.
The DRIVE MODE switch, located on
the shift lever/button console, allows
the driver to switch from NORMAL/
COMFORT mode to SPORT or ECO mode. (if equipped)
For more details, refer to “Drive Mode
Integrated Control System” later in this
chapter. Shift-lock system
For your safety, the automatic
transmission has a shift-lock system
which prevents shifting the transmission
from P (Park) or N (Neutral) to R
(Reverse) or D (Drive) unless the brake
pedal is depressed.
To shift the transmission from P (Park)
into R (Reverse):
1. Depress and hold the brake pedal.
2. Start the engine or place the ignition
switch in the ON position.
3. Depress the brake pedal and move the shift lever to R (Reverse). (shift lever
type)
Depress the brake pedal and push the
R (Reverse) button. (shift button type)
When the battery is discharged:
You cannot shift the shift lever/button,
when the battery is discharged.
In emergencies, do the following
to move the shift lever/button to N
(Neutral) on a level ground.
1. Connect the battery cables from another vehicle or from a another
battery to the jump-starting terminals
inside the engine compartment.
For more details, refer to “Jump
Starting” in chapter 8.
2. Release the parking brake with the ignition switch in the ON position.
3. Shift the gear to the N(Neutral) position refer to the “Stay in Neutral
when vehicle is Off” in this chapter.

06
6-27
Parking
Always come to a complete stop and
continue to depress the brake pedal.
Move the shift lever/button into the P
(Park) position, apply the parking brake,
and place the ignition switch in the
LOCK/OFF position. Take the Key with
you when exiting the vehicle.
WARNING
When you stay in the vehicle with
the engine running, be careful not to
depress the accelerator pedal for a long
period of time. The engine or exhaust
system may overheat and start a fire.
The exhaust gas and the exhaust system
are very hot. Keep away from the
exhaust system components.
Do not stop or park over flammable
materials, such as dry grass, paper or
leaves. They may ignite and cause a fire.
LCD display message (button
type)
Shifting conditions not met. Reduce speed, then shift
The warning message appears on the
LCD display, when engine RPM is too
high, or when driving speed is too fast to
shift the gear.
We recommend you decrease the engine
speed or slow down before shifting the
gear.
Press brake pedal to change gear
The warning message appears on the
LCD display, when the brake pedal is not
depressed while shifting the gear.
We recommend you to depress the brake
pedal and then shift the gear.
Shift to P after stopping
The warning message appears on the
LCD display, when the gear is shifted to P
(Park) while the vehicle is moving.
Stop the vehicle before shifting to P
(Park).
PARK engaged
The warning message appears on the
LCD display, when the gear is shifted to P
(Park) while the vehicle is moving.
Stop the vehicle before shifting to P
(Park).

06
6-29
Good driving practices
• Never move the shift lever/button
from P (Park) or N (Neutral) to any
other position with the accelerator
pedal depressed.
• Never move the shift lever/button into
P (Park) when the vehicle is in motion.
Be sure the vehicle is completely
stopped before you attempt to shift
into R (Reverse) or D (Drive).
• Do not move the shift lever/button
to N (Neutral) when driving. Doing
so may result in an accident because
of a loss of engine braking and the
transmission could be damaged.
• Do not drive with your foot resting
on the brake pedal. Even light, but
consistent pedal pressure can result
in the brakes overheating, brake wear
and possibly even brake failure.
• Always apply the parking brake when
leaving the vehicle. Do not depend on
placing the transmission in P (Park) to
keep the vehicle from moving.
• Exercise extreme caution when
driving on a slippery surface. Be
especially careful when braking,
accelerating or shifting gears. On a
slippery surface, an abrupt change
in vehicle speed can cause the drive
wheels to lose traction and may cause
loss of vehicle control resulting in an
accident.
• Optimum vehicle performance and
economy is obtained by smoothly
depressing and releasing the
accelerator. WARNING
To reduce the risk of SERIOUS INJURY
or DEATH: • ALWAYS wear your seatbelt. In a
collision, an unbelted occupant
is significantly more likely to be
seriously injured or killed than a
properly belted occupant.
• Avoid high speeds when cornering or turning.
• Do not make quick steering wheel
movements, such as sharp lane
changes or fast, sharp turns.
• The risk of rollover is greatly
increased if you lose control of your
vehicle at highway speeds.
• Loss of control often occurs if two or
more wheels drop off the roadway
and the driver over steers to reenter
the roadway.
• In the event your vehicle leaves
the roadway, do not steer sharply.
Instead, slow down before pulling
back into the travel lanes.
• HYUNDAI recommends you follow all
posted speed limits.

While Driving
6-30
BrAke SySteM
Power Brakes
Your vehicle has power-assisted brakes
that adjust automatically through normal usage.
If the engine is not running or is turned
off while driving, the power assist for
the brakes will not work. You can still
stop your vehicle by applying greater
force to the brake pedal than typical.
The stopping distance, however, will be
longer than with power brakes.
When the engine is not running, the
reserve brake power is partially depleted
each time the brake pedal is applied.
Do not pump the brake pedal when the
power assist has been interrupted.
Only pump the brakes on slippery
surfaces if the power assist has been
interrupted to maintain steering control.
Do not pump the brakes on slippery
surfaces if the brakes are operating
normally.
WARNING
Take the following precautions: • Do not drive with your foot resting
on the brake pedal. This will create
abnormal high brake temperatures,
excessive brake lining and pad wear,
and increased stopping distances.
• When descending down a long or
steep hill, move the gear shift button
to Manual Shift Mode and manually
downshift to a lower gear in order
to control your speed without using
the brake pedal excessively. Applying
the brakes continuously will cause
the brakes to overheat and could
result in a temporary loss of braking
performance.
• Wet brakes may impair the vehicle's
ability to safely slow down; the
vehicle may also pull to one side
when the brakes are applied.
Applying the brakes lightly will
indicate whether they have been
affected in this way. Always test your
brakes in this fashion after driving
through deep water. To dry the
brakes, lightly tap the brake pedal to
heat up the brakes while maintaining
a safe forward speed until brake
performance returns to normal.
Avoid driving at high speeds until the
brakes function correctly.
Disc Brakes Wear Indicator
When your brake pads are worn and new
pads are required, you will hear a high
pitched warning sound from your front
or rear brakes. You may hear this sound
come and go or it may occur whenever
you depress the brake pedal.
Note that some driving conditions or
climates may cause a brake squeal
when you first apply (or lightly apply)
the brakes. This is normal and does not
indicate a problem with your brakes.
NOTICE
To avoid costly brake repairs, do not
continue to drive with worn brake pads.
Information
Always replace brake pads as complete
front or rear axle sets.