2020 NISSAN SENTRA brakes

1. Vehicle ahead detection indicator
2. AEB with Pedestrian Detection emer-gency warning indicator
3. AEB with Pedestrian Detection system warning light
The AEB system operates at speeds above
approximately 3 mph (5 km/h). For the pe-
destrian detection function, the system
operates at speeds between6–37mph(10
– 60 km/h).
If a risk of a forward collision is detected,
the AEB with Pedestrian Detection system
will firstly provide the warning to the driver
by flashing the vehicle ahead detection in-
dicator (yellow) in the vehicle information
display and providing an audible alert. If the
driver applies the brakes quickly and force-
fully af ter the warning, and the AEB with
Pedestrian Detection system detects that
there is still the possibility of a forward col-
lision, the system will automatically in-
crease the braking force.
If the driver does not take action, the AEB
with Pedestrian Detection system issues
the second visual (flashing) (red and white)
and audible warning. If the driver releases
the accelerator pedal, then the system ap-
plies partial braking. If the risk of a collision
LSD3794
For the vehicle with 4.2 inch meter display
Starting and driving5-83

becomes imminent, the AEB with Pedes-
trian Detection system applies harder
braking automatically.
While the AEB with Pedestrian Detection
system is operating, you may hear the
sound of brake operation. This is normal
and indicates that the AEB with Pedestrian
Detection system is operating properly.
NOTE:
The vehicle’s brake lights come on when
any braking is performed by the AEB
with Pedestrian Detection system.
Depending on vehicle speed and distance
to the vehicle or pedestrian ahead, as well
as driving and roadway conditions, the sys-
tem may help the driver avoid a forward
collision or may help mitigate the conse-
quences if a collision should be unavoid-
able. If the driver is handling the steering
wheel, accelerating or braking, the AEB with
Pedestrian Detection system will function
later or will not function.
The automatic braking will cease under the
following conditions:
• When the steering wheel is turned toavoid a collision.
• When the accelerator pedal is depressed. • When there is no longer a vehicle or a
pedestrian detected ahead.
If the AEB with Pedestrian Detection sys-
tem has stopped the vehicle, the vehicle
will remain at a standstill for approximately
2 seconds before the brakes are released.
5-84Starting and driving

The brake system has two separate hy-
draulic circuits. If one circuit malfunctions,
you will still have braking at two wheels.
BRAKE PRECAUTIONS
Vacuum assisted brakes
The brake booster aids braking by using
engine vacuum. If the engine stops, you
can stop the vehicle by depressing the
brake pedal. However, greater foot pres-
sure on the brake pedal will be required to
stop the vehicle and stopping distance will
be longer.
Using the brakes
Avoid resting your foot on the brake pedal
while driving. This will overheat the brakes,
wear out the brake pads faster, and reduce
gas mileage.
To help reduce brake wear and to prevent
the brakes from overheating, reduce speed
and downshif t to a lower gear before going
down a slope or long grade. Overheated
brakes may reduce braking performance
and could result in loss of vehicle control.
WARNING
• While driving on a slippery surface,
be careful when braking, accelerat-
ing or downshif ting. Abrupt braking
or accelerating could cause the
wheels to skid and result in an
accident.
• If the engine is not running or is
turned off while driving, the power
assist for the brakes will not work.
Braking will be harder.
Wet brakes
When the vehicle is washed or driven
through water, the brakes may get wet. As
a result, your braking distance will be lon-
ger and the vehicle may pull to one side
during braking.
To dry the brakes, drive the vehicle at a safe
speed while lightly pressing the brake
pedal to heat up the brakes. Do this until
the brakes return to normal. Avoid driving
the vehicle at high speeds until the brakes
function correctly.
Parking brake break-in
Break in the parking brake shoes whenever
the stopping effect of the parking brake is
weakened or whenever the parking brake
shoes and/or drums/rotors are replaced,
in order to assure the best braking perfor-
mance.
This procedure is described in the vehicle
service manual. It is recommended that
you visit a NISSAN dealer for this service.
ANTI-LOCK BRAKING SYSTEM (ABS)
WARNING
• The ABS is a sophisticated device, but
it cannot prevent accidents resulting
from careless or dangerous driving
techniques. It can help maintain ve-
hicle control during braking on slip-
pery surfaces. Remember that stop-
ping distances on slippery surfaces
will be longer than on normal sur-
faces even with ABS. Stopping dis-
tances may also be longer on rough,
gravel or snow covered roads, or if
you are using tire chains. Always
maintain a safe distance from the ve-
hicle in front of you. Ultimately, the
driver is responsible for safety.
BRAKE SYSTEM
5-114Starting and driving

•Tire type and condition may also af-
fect braking effectiveness.
– When replacing tires, install the
specified size of tires on all four
wheels.
– When installing a spare tire, make
sure that it is the proper size and
type as specified on the Tire and
Loading Information label. For ad-
ditional information, refer to “Tire
and Loading Information label” in
the “Technical and consumer in-
formation” section of this manual.
– For additional information, refer
to “Wheels and tires” in the “Do-it-
yourself ” section of this manual.
The ABS controls the brakes so the wheels
do not lock during hard braking or when
braking on slippery surfaces. The system
detects the rotation speed at each wheel
and varies the brake fluid pressure to pre-
vent each wheel from locking and sliding.
By preventing each wheel from locking, the
system helps the driver maintain steering
control and helps to minimize swerving
and spinning on slippery surfaces.Using the system
Depress the brake pedal and hold it down.
Depress the brake pedal with firm steady
pressure, but do not pump the brakes. The
Anti-lock Braking System will operate to
prevent the wheels from locking up. Steer
the vehicle to avoid obstacles.
WARNING
Do not pump the brake pedal. Doing so
may result in increased stopping dis-
tances.
Self-test feature
The Anti-lock Braking System (ABS) includes
electronic sensors, electric pumps, hydraulic
solenoids and a computer. The computer
has a built-in diagnostic feature that tests
the system each time you start the engine
and move the vehicle at a low speed in for-
ward or reverse. When the self-test occurs,
you may hear a “clunk” noise and/or feel a
pulsation in the brake pedal. This is normal
and does not indicate a malfunction. If the
computer senses a malfunction, it switches
the ABS off and illuminates the ABS warning
light on the instrument panel. The brake sys-
tem then operates normally, but without
anti-lock assistance.
If the ABS warning light illuminates during
the self-test or while driving, have the ve-
hicle checked. It is recommended that you
visit a NISSAN dealer for this service.
Normal operation
The Anti-lock Braking System (ABS) oper-
ates at speeds abov e3-6mph(5-10
km/h). The speed varies according to road
conditions.
When the ABS senses that one or more
wheels are close to locking up, the actuator
rapidly applies and releases hydraulic pres-
sure. This action is similar to pumping the
brakes very quickly. You may feel a pulsa-
tion in the brake pedal and hear a noise
from under the hood or feel a vibration
from the actuator when it is operating. This
is normal and indicates that the ABS is op-
erating properly. However, the pulsation
may indicate that road conditions are haz-
ardous and extra care is required while
driving.
Starting and driving5-115

When the vehicle is stopped on a hill, the hill
start assist system automatically keeps
the brakes applied to help prevent the ve-
hicle from rolling backward in the time it
takes the driver to release the brake pedal
and apply the accelerator.
The hill start assist system will operate au-
tomatically under the following conditions:
• The transmission is shif ted to a forwardor reverse gear.
• The vehicle is stopped completely on a hill by applying the brake. The maximum
holding time is 2 seconds. Af ter 2 sec-
onds the vehicle will begin to roll back and
the hill start assist system will stop oper-
ating completely.
The hill start assist system will not operate
when the shif t lever is placed in the N (Neu-
tral) or P (Park) position or on a flat and level
road. The RSS sounds a tone to inform the driver
of obstacles near the bumper.
When the “DISPLAY” key is on, the sonar
view will automatically appear in the
touch-screen display. An additional view of
the sonar status will appear in the vehicle
information display for reference.
WARNING
• The RSS is a convenience but it is not
a substitute for proper parking. •
The driver is always responsible for
safety during parking and other ma-
neuvers. Always look around and
check that it is safe to do so before
parking.
• Read and understand the limitations
of the RSS as contained in this sec-
tion. The colors of the corner sonar
indicator and the distance guide
lines in the rear view indicate differ-
ent distances to the object.
• Inclement weather or ultrasonic
sources such as an automatic car
wash, a truck's compressed-air
brakes or a pneumatic drill may af-
fect the function of the system; this
may include reduced performance or
a false activation.
• This function is designed as an aid to
the driver in detecting large station-
ary objects to help avoid damaging
the vehicle.
• The system is not designed to pre-
vent contact with small or moving
objects. Always move slowly. The
system will not detect small objects
below the bumper, and may not de-
tect objects close to the bumper or
on the ground.
LSD3247
REAR SONAR SYSTEM (RSS)
5-120Starting and driving

For vehicles with the 4.2 inch meter dis-
play:
1. Press the
button until “Settings” dis-
plays in the vehicle information display.
Use the
button to select “Driver As-
sistance.” Then press the OK button.
2. Select “Parking Aids” and press the OK button.
3. Select “Rear Sonar” and press the OK button to turn the system on or off.
– Select “Display” to display the parking sensor in the vehicle information display
when the sonar system activates.
– Select “Distance” to change the sonar system distance to “Long,” “Medium” or
“Short.”
– Select “Volume” to change the volume to “High,” “Medium” or “Low”
SONAR LIMITATIONS
WARNING
Listed below are the system limitations
for the sonar system. Failure to operate
the vehicle in accordance with these
system limitations could result in seri-
ous injury or death. •
Read and understand the limitations
of the sonar system as contained in
this section. Inclement weather may
affect the function of the sonar sys-
tem; this may include reduced per-
formance or a false activation.
• The system is deactivated at speeds
above 6 mph (10 km/h). It is reacti-
vated at lower speeds.
• Inclement weather or ultrasonic
sources such as an automatic car
wash, a truck’s compressed-air
brakes or a pneumatic drill may af-
fect the function of the system; this
may include reduced performance or
a false activation.
• The system is not designed to pre-
vent contact with small or moving
objects. Always move slowly. The
system will not detect small objects
below the bumper or on the ground.
• The system may not detect the fol-
lowing objects: fluff y objects such as
snow, cloth, cotton, glass-wool, etc.;
thin objects such as rope, wire and
chain, etc.; or wedge-shaped objects.
• The system may not detect objects
at speeds above 3 mph (5 km/h) and
may not detect certain angular or
moving objects.
SYSTEM TEMPORARILY
UNAVAILABLE
When sonar blockage is detected, the sys-
tem will be deactivated automatically.
The system is not available until the condi-
tions no longer exist.
The sonar sensors may be blocked by tem-
porary ambient conditions such as splash-
ing water, mist or fog. The blocked condi-
tion may also be caused by objects such as
ice, frost or dirt obstructing the sonar sen-
sors.
Action to take:
When the above conditions no longer exist,
the system will resume automatically.
5-124Starting and driving

8 Do-it-yourself
Maintenance precautions.......................8-2
Engine compartment check locations ...........8-4
Engine cooling system ..........................8-5
Checking engine coolant level ................8-6
Changing engine coolant ....................8-6
Engine oil .......................................8-7
Checking engine oil level .....................8-7
Changing engine oil and oil filter ..............8-7
Continuously Variable Transmission (CVT)
fluid (if so equipped) ............................ 8-10
Brake and clutch (if so equipped) fluid ..........8-10
Brake fluid ................................... 8-10
Clutch (if so equipped) fluid ...................8-11
Windshield-washer fluid .........................8-11
Windshield-washer fluid reservoir ............8-11
Battery......................................... 8-12
Jump starting ............................... 8-13
Variable voltage control system ................8-14
Drive belt ....................................... 8-14
Spark plugs .................................... 8-15
Replacing spark plugs ....................... 8-15
Air cleaner ..................................... 8-16In-cabin microfilter
.......................... 8-16
Windshield wiper blades ........................8-17
Cleaning .................................... 8-17
Replacing ................................... 8-17
Brakes ......................................... 8-18
Fuses .......................................... 8-19
Engine compartment ....................... 8-19
Passenger compartment ...................8-21
Battery replacement ........................... 8-22
NISSAN Intelligent Key® ......................8-23
Lights .......................................... 8-24
Headlights .................................. 8-24
Turn signal bulb ............................. 8-25
Fog lights (if so equipped) ...................8-25
Exterior and interior lights ...................8-26
Wheels and tires ...............................
8-28
Tir

e pressure ................................ 8-28
Tire labeling ................................. 8-31
Types of tires ................................ 8-34
Tire chains .................................. 8-35
Changing wheels and tires ..................8-36

If you wax the surface of the hood, be care-
ful not to let wax get into the washer nozzle
OD. This may cause clogging or improper
windshield-washer operation. If wax gets
into the nozzle, remove it with a needle or
small pin
OC. If the brakes do not operate properly, have
the brakes checked. It is recommended
that you visit a NISSAN dealer for this ser-
vice.
Self-adjusting brakes
Your vehicle is equipped with self-adjusting
brakes.
The front (and rear-if so equipped) disc-
type brakes self-adjust every time the
brake pedal is applied. The rear drum-type
brakes (if so equipped) self-adjust every
time the parking brake is applied.
WARNING
Have your brake system checked if the
brake pedal height does not return to
normal. It is recommended that you
visit a NISSAN dealer for this service.
Brake pad wear indicators
The disc brake pads on your vehicle have
audible wear indicators. When a brake pad
requires replacement, a high pitched
scraping or screeching sound will be heard
when the vehicle is in motion. The noise will
be heard whether or not the brake pedal is
depressed. Have the brakes checked as soon as possible if the wear indicator
sound is heard.
Under some driving or climate conditions,
occasional brake squeak, squeal or other
noise may be heard. Occasional brake
noise during light to moderate stops is nor-
mal and does not affect the function or
performance of the brake system.
Proper brake inspection intervals should
be followed.
For additional information re-
garding brake inspections, refer to the ap-
propriate maintenance schedule informa-
tion in the "Maintenance and schedules"
section of this manual.LDI2731
BRAKES
8-18Do-it-yourself