brake SUBARU WRX 2016 Service Manual

Starting and operating/Continuously variable transmission
may not be moved to the “ P ” position after
a period of time. Therefore, move the
select lever to the “ P ” position with the
brake pedal depressed soon after the
ignition switch is turned to the “ LOCK ” /
“ OFF ” position.
! Shift lock release
If the select lever cannot be operated, turn
the ignition switch back to the “ ON ”
position then move the select lever to the
“ P ” position with the select lever button
pressed and brake pedal depressed.
If the select lever does not move after
performing the above procedure, perform
the following steps.
. When the select lever cannot be
shifted from “ P ” to “ N ” :
Refer to “ Shift lock release using the shift
lock release button ” F 7-28.
. When the select lever cannot be
shifted from “ N ” to “ R ” , “ P ” :
Within 60 seconds after placing the igni-
tion switch in the “ ACC ” position, move the
select lever to the “ P ” position with the
select lever button pressed and brake
pedal depressed.
If you must perform the above procedure,
the shift lock system (or the vehicle control
system) may be malfunctioning. Contact a SUBARU dealer for an inspection as soon
as possible.
If the select lever does not move after
performing the above procedure, refer to
“ Shift lock release using the shift lock
release button ” F 7-28.
! Shift lock release using the shift
lock release button
Perform the following procedure to release
the shift lock.
1. Apply the parking brake and stop the
engine.
2. Wrap the tip of a flat-head screwdriver
with vinyl tape or a cloth and use it to
remove the shift lock cover. The shift lock
release button is located under the shift
lock cover. 3. While depressing the brake pedal,
insert a screwdriver into the hole, press
the shift lock release button using a
screwdriver, and then move the select
lever.
If the select lever does not move after
performing the above procedure, the shift
lock system may be malfunctioning. Con-
tact a SUBARU dealer for an inspection
as soon as possible.
& Driving tips . Always apply the foot or parking brake
when the vehicle is stopped in the “ D ” or
“ R ” position.
. Always apply the parking brake when
parking your vehicle. Do not hold the
vehicle with only the mechanical friction
of the transmission.7-28

. Do not keep the vehicle in a stationary
position on an uphill grade by using the
“ D ” position. Use the brake instead.
. The engine may, on rare occasions,
knock when the vehicle rapidly acceler-
ates or rapidly pulls away from a standstill.
This phenomenon does not indicate a
malfunction.
SI-DRIVE (STI) SI-DRIVE (SUBARU Intelligent Drive)
works to maximize engine performance,
control and efficiency.
This system consists of three modes:
Intelligent (I), Sport (S), and Sport Sharp
(S#). By adjusting the SI-DRIVE selector,
the character of the power unit changes.
& Intelligent (I) mode ! For smooth, efficient performance
driving
The Intelligent (I) mode provides well-
balanced performance with greater fuel
efficiency and smooth driveability without
stress. Power delivery is moderate during
acceleration for maximum fuel efficiency. This is ideal for around-town driving and
situations that do not require full power
output. It provides better control in difficult
driving conditions, such as slippery roads
or loose surfaces, due to gentler throttle
response.
When the Intelligent (I) mode is selected,
a shift-up indicator “
” on the combina-
tion meter will blink to signal the best time
to shift gears for maximum fuel efficiency. Starting and operating/SI – DRIVE (STI)
– CONTINUED –7-29

Starting and operating/SI – DRIVE (except STI: CVT models)
& Sport Sharp (S#) mode! For maximum performance driving
For sports-minded drivers, the Sport
Sharp (S#) mode offers an exhilarating
level of engine performance and control.
The throttle becomes more responsive
regardless of the engine speed. Delivering
maximum driving enjoyment, this mode is
ideal for tackling twisting roads and for
merging or overtaking other vehicles on
the freeway with confidence.
When you select the Sport Sharp (S#)
mode while the select lever is in the “ D ”
position, the transmission gear ratio will
shift from variable speed to eight-speed.
The select lever/gear position indicator
display will change from “ D ” to the gear
position. When selecting Sport Sharp (S#) mode,
the following controls will be applied.
Uphill control: Prevents unnecessary
shift-up/shift-down during ascent.
Cornering control: While turning, if there
is a large centrifugal force, shift-up will not
occur: during re-acceleration.
Braking control: At the beginning of
corners etc., heavy application of the
brake pedal will cause automatic down-
shift and gently re-accelerate.
Sudden acceleration return control:
During acceleration, if acceleration pedal
is returned suddenly (for example, at
corners etc.), shift-up will not be applied. & SI-DRIVE switches
NOTE If any of the SI-DRIVE indicators blink,
the SI-DRIVE system may be malfunc-
tioning. Contact your SUBARU dealer.
SI-DRIVE switches
To select the Intelligent (I) mode, perform
either of the following procedures.
. Press the “ S/I ” switch when the Sport
(S) mode is selected
. Press the “ S#/I ” switch when the Sport
Sharp (S#) mode is selected
To select the Sport (S) mode, press the “ S/
I ” switch when any mode other than Sport
(S) mode is selected.
To select the Sport Sharp (S#) mode,
press the “ S#/I ” switch when any mode7-32

Braking & Braking tips WARNINGNever rest your foot on the brake
pedal while driving. This can cause
dangerous overheating of the
brakes and needless wear on the
brake pads and linings.
! When the brakes get wet
When driving in rain or after washing the
vehicle, the brakes may get wet. As a
result, brake stopping distance will be
longer. To dry the brakes, drive the vehicle
at a safe speed while lightly depressing
the brake pedal to heat up the brakes.
! Use of engine braking
Remember to make use of engine braking
in addition to foot braking. When descend-
ing a grade, if only the foot brake is used,
the brakes may start working improperly
because of brake fluid overheating,
caused by overheated brake pads. To
help prevent this, shift into a lower gear to
get stronger engine braking.
! Braking when a tire is punctured
Do not depress the brake pedal suddenly
when a tire is punctured. This could cause a loss of control of the vehicle. Keep
driving straight ahead while gradually
reducing speed. Then slowly pull off the
road to a safe place.
& Brake system ! Two separate circuits
Your vehicle has two separate circuit
brake systems. Each circuit works diag-
onally across the vehicle. If one circuit of
the brake system should fail, the other half
of the system still works. If one circuit fails,
the brake pedal will go down much closer
to the floor than usual and you will need to
press it down much harder. And a much
longer distance will be needed to stop the
vehicle.
! Brake booster
The brake booster uses engine manifold
vacuum to assist braking force. Do not
turn off the engine while driving because
that will turn off the brake booster, result-
ing in poor braking power.
The brakes will continue to work even
when the brake booster completely stops
functioning. If this happens, however, you
will have to depress the pedal much
harder than normal and the braking dis-
tance will increase. ! Brake assist system
WARNINGDo not be overconfident about the
brake assist. It is not a system that
brings more braking ability to the
vehicle beyond its braking capabil-
ity. Always use the utmost care
when driving regarding vehicle
speed and safe distance.
CAUTIONWhen you need to brake suddenly,
continue depressing the brake pedal
strongly to obtain the effect of the
brake assist.
Brake assist is a driver assistance system.
It assists the brake power when the driver
cannot depress the brake pedal strongly
and the brake power is insufficient.
Brake assist generates the brake power
according to the speed at which the driver
depresses the brake pedal.
NOTE When you depress the brake pedal
strongly or suddenly, the following
phenomena occur. However, even
though these occur, they do not indi- Starting and operating/Braking
– CONTINUED –7-35

Starting and operating/ABS (Anti – lock Brake System)
cate any malfunctions, and the brake
assist system is operating properly.
. You might feel that the brake pedal
is applied by lighter force and gener-
ates a greater braking force.
. You might hear an ABS operating
noise from the engine compartment.
& Disc brake pad wear warning
indicators
The disc brake pad wear warning indica-
tors on the disc brakes give a warning
noise when the brake pads are worn.
If a squeaking or scraping noise is heard
from the disc brakes while braking, im-
mediately have your vehicle checked by
your SUBARU dealer. ABS (Anti-lock Brake Sys-
tem) The ABS prevents the lock-up of wheels
which may occur during sudden braking or
braking on slippery road surfaces. This
helps prevent the loss of steering control
and directional stability caused by wheel
lock-up.
When the ABS is operating, you may hear
a chattering noise or feel a slight vibration
in the brake pedal. This is normal when
the ABS operates.
The ABS will not operate when the vehicle
speed is below approximately 6 mph (10
km/h).
WARNING
Always use the utmost care in
driving – overconfidence because
you are driving a vehicle with the
ABS could easily lead to a serious
accident.
CAUTION
. The ABS does not always de-
crease stopping distance. You
should always maintain a safe following distance from other
vehicles.
. When driving on badly surfaced
roads, gravel roads, icy roads, or
over deep newly fallen snow,
stopping distances may be long-
er for a vehicle with the ABS than
one without. When driving under
these conditions, therefore, re-
duce your speed and leave ample
distance from other vehicles.
. When you feel the ABS operating,
you should maintain constant
brake pedal pressure. Do not
pump the brake pedal since
doing so may defeat the opera-
tion of the ABS system.
& ABS self-check Just after the vehicle is started, you may
feel on the brake pedal a vibration similar
to when the ABS operates, and you may
also hear the sound of the ABS working
from the engine compartment. This is
caused by an automatic functional test of
the ABS being carried out and does not
indicate any abnormal condition.7-36

& ABS warning light Refer to “ ABS warning light ” F 3-20.
Electronic Brake Force Dis-
tribution (EBD) system The EBD system maximizes the effective-
ness of the brakes by allowing the rear
brakes to supply a greater proportion of
the braking force. It functions by adjusting
the distribution of braking force to the rear
wheels in accordance with the vehicle ’ s
loading condition and speed.
The EBD system is an integral part of the
ABS and uses some of the ABS compo-
nents to perform its function of optimizing
the distribution of braking force. If any of
the ABS components used by the EBD
system malfunction, the EBD system also
stops working.
When the EBD system is operating, you
may hear a chattering noise or feel a slight
vibration in the brake pedal. This is normal
and does not indicate a malfunction. & Steps to take if EBD system
malfunctions
Brake and ABS warning light
If a malfunction occurs in the EBD system,
the system stops working and the brake
system warning light and ABS warning
light illuminate simultaneously.
The EBD system may be malfunctioning if
the brake system warning light and ABS
warning light illuminate simultaneously
during driving.
Even if the EBD system malfunctions, the
conventional braking system will still func-
tion. However, the rear wheels will be
more prone to locking when the brakes
are applied harder than usual and the
vehicle ’ s motion may therefore become
somewhat harder to control.Starting and operating/Electronic Brake Force Distribution (EBD) system
– CONTINUED –7-37

Starting and operating/Vehicle Dynamics Control system
If the brake system warning light and ABS
warning light illuminate simultaneously,
take the following steps.
1. Stop the vehicle in the nearest safe,
flat location.
2. Apply the parking brake and turn off
the engine.
3. Restart the engine.
4. Release the parking brake.
Even if both warning lights turn off:
The EBD system may be malfunctioning.
Drive carefully to the nearest SUBARU
dealer and have the system inspected.
If both warning lights illuminate again
and remain illuminated after restarting
the engine:
1. Turn off the engine again.
2. Apply the parking brake.
3. Check the brake fluid level. For details
about checking the brake fluid level, refer
to “ Checking the fluid level ” F 11-25.
. If the brake fluid level is not below the
“ MIN ” mark, the EBD system may be
malfunctioning. Drive carefully to the
nearest SUBARU dealer and have the
system inspected.
. If the brake fluid level is below the
“ MIN ” mark, DO NOT drive the vehicle.
Instead, have the vehicle towed to the nearest SUBARU dealer for repair.
WARNING. Driving with the brake system
warning light illuminated is dan-
gerous. This indicates your brake
system may not be working
properly. If the light remains
illuminated, have the brakes in-
spected by a SUBARU dealer
immediately.
. If at all in doubt about whether
the brakes are operating prop-
erly, do not drive the vehicle.
Have your vehicle towed to the
nearest SUBARU dealer for re-
pair. Vehicle Dynamics Control
system WARNINGAlways use the utmost care in
driving – overconfidence because
you are driving a vehicle with the
Vehicle Dynamics Control system
could easily lead to a serious acci-
dent.
CAUTION. Even if your vehicle is equipped
with Vehicle Dynamics Control
system, winter tires should be
used when driving on snow-cov-
ered or icy roads; in addition,
vehicle speed should be reduced
considerably. Simply having a
Vehicle Dynamics Control sys-
tem does not guarantee that the
vehicle will be able to avoid
accidents in any situation.
. Activation of the Vehicle Dy-
namics Control system is an
indication that the road being
travelled on has a slippery sur-
face; since having Vehicle Dy-7-38

namics Control is no guarantee
that full vehicle control will be
maintained at all times and under
all conditions, its activation
should be seen as a sign that
the speed of the vehicle should
be reduced considerably.
. Whenever suspension compo-
nents, steering components, or
an axle are removed from a
vehicle, have an inspection of
that system performed by an
authorized SUBARU dealer.
. The following precautions should
be observed in order to ensure
that the Vehicle Dynamics Con-
trol system is operating properly:
– All four wheels should be
fitted with tires of the same
size, type, and brand. Further-
more, the amount of wear
should be the same for all
four tires.
– Keep the tire pressure at the
proper level as shown on the
vehicle placard attached to
the driver ’ s side door pillar.
– Use only the specified tem-
porary spare tire to replace a
flat tire. With a temporary
spare tire, the effectiveness of the Vehicle Dynamics Con-
trol system is reduced and
this should be taken into ac-
count when driving the vehi-
cle in such a condition.
. If non-matching tires are used,
the Vehicle Dynamics Control
system may not operate cor-
rectly.
. The Vehicle Dynamics Control
system helps prevent unstable
vehicle motion such as skidding
using control of the brakes and
engine power. Do not turn off the
Vehicle Dynamics Control sys-
tem unless it is absolutely ne-
cessary. If you must turn off the
Vehicle Dynamics Control sys-
tem, drive very carefully accord-
ing to the road surface condition.
In the event of wheelspin and/or skidding
on a slippery road surface and/or during
cornering and/or an evasive maneuver,
the Vehicle Dynamics Control system
adjusts the engine ’ s output and the
wheels ’ respective braking forces to help
maintain traction and directional control.
. Traction Control Function
The traction control function is designed to
prevent spinning of the driving wheels on slippery road surfaces, thereby helping to
maintain traction and directional control.
Activation of this function is shown by
flashing the Vehicle Dynamics Control
operation indicator light.
. Skid Suppression Function
The skid suppression function is designed
to help maintain directional stability by
suppressing the wheels ’ tendency to slide
sideways during steering operations. Acti-
vation of this function is shown by flashing
of the Vehicle Dynamics Control operation
indicator light.
Vehicle Dynamics Control operation indi-
cator light
NOTE
. The Vehicle Dynamics Control sys-
tem may be considered normal whenStarting and operating/Vehicle Dynamics Control system
– CONTINUED –7-39

Starting and operating/Vehicle Dynamics Control system
the following conditions occur.
– Slight twitching of the brake
pedal is felt.
– The vehicle or steering wheel
shakes to a small degree.
– An operating sound from the
engine compartment is heard
briefly when starting the engine
and when driving off after starting
the engine.
– The brake pedal seems to jolt
when driving off after starting the
engine.
. In the circumstances shown in the
following list, the vehicle may be less
stable than it feels to the driver. The
Vehicle Dynamics Control System may
therefore operate. Such operation does
not indicate a system malfunction.
– on gravel-covered or rutted
roads
– on unfinished roads
– when the vehicle is fitted with
snow tires or winter tires
. Activation of the Vehicle Dynamics
Control system will cause operation of
the steering wheel to feel slightly
different compared to that for normal
conditions.
. It is always important to reduce
speed when approaching a corner,
even if your vehicle is equipped with the Vehicle Dynamics Control system.
. Always turn off the engine before
replacing a tire. Failure to do so may
render the Vehicle Dynamics Control
system unable to operate correctly.
& Vehicle Dynamics Control
system monitor Refer to “ Vehicle Dynamics Control warn-
ing light/Vehicle Dynamics Control opera-
tion indicator light ” F 3-26 and “ Vehicle
Dynamics Control OFF indicator light/
Traction mode indicator light ” F 3-27.& Vehicle Dynamics Control
OFF switch
1) Traction mode indicator light
2) Vehicle Dynamics Control OFF indicator
light7-40

Starting and operating/Tire pressure monitoring system (TPMS) (U.S. – spec. models)
nents of the brake control system may
still activate. When the brake control
system is activated, the Vehicle Dy-
namics Control operation indicator
light illuminates.
Tire pressure monitoring
system (TPMS) (U.S.-spec.
models)
Low tire pressure warning light
The tire pressure monitoring system pro-
vides the driver with a warning message
by sending a signal from a sensor that is
installed in each wheel when tire pressure
is severely low.
The tire pressure monitoring system will
activate only when the vehicle is driven at
speeds above 20 mph (32 km/h). Also,
this system may not react immediately to a
sudden drop in tire pressure (for example,
a blow-out caused by running over a
sharp object). WARNING. If the low tire pressure warning
light illuminates while driving,
never brake suddenly. Instead,
perform the following procedure.
Otherwise, an accident involving
serious vehicle damage and ser-
ious personal injury could occur.
(1) Keep driving straight ahead
while gradually reducing
speed.
(2) Slowly pull off the road to a
safe place.
(3) Check the pressure for all four
tires and adjust the pressure
to the COLD tire pressure
shown on the vehicle placard
on the door pillar on the
driver ’ s side.
Even when the vehicle is driven a
very short distance, the tires get
warm and their pressures in-
crease accordingly. Be sure to
let the tires cool thoroughly be-
fore adjusting their pressures to
the standard values shown on
the tire placard. Refer to “ Tires
and wheels ” F 11-31. The tire
pressure monitoring system
does not function when the ve-7-42