2016 SUBARU IMPREZA service

&Replacing the air cleaner
element
Replace the air cleaner element according
to the maintenance schedule in the
“Warranty and Maintenance Booklet ”. Un-
der extremely dusty conditions, replace it
more frequently. It is recommended that
you always use genuine SUBARU parts.
1) Connector
2) Clip
3) Clamp
4) Air intake boot
5) Clip
1. Unplug the connector that is attached
to the top of the air cleaner case.
2. Detach the connector cable from the
clip on the right side of the air cleaner
case. 3. Loosen the screw on the clamp and
pull the air intake boot out of the air
cleaner case.
4. Unsnap the two clips holding the air
cleaner case (rear).
5. Open the air cleaner case and remove
the air cleaner element.
6. Clean the inside of the air cleaner case
(both front and rear) with a damp cloth and
install a new air cleaner element.
7. To install the air cleaner case (rear),
insert the three projections on the air
cleaner case (rear) into the slits on the
air cleaner case (front).
8. Install in the reverse order of removal.
Maintenance and service/Air cleaner element11-13

Maintenance and service/Spark plugs
Spark plugs
It may be difficult to replace the spark
plugs. It is recommended that you have
the spark plugs replaced by your
SUBARU dealer.
The spark plugs should be replaced
according to the maintenance schedule
in the“Warranty and Maintenance Book-
let ”.
CAUTION
Make sure the cables are replaced in
the correct order.
& Recommended spark plugs
For the recommended spark plugs, refer
to“Electrical system ”F 12-7.
Drive belts
It is unnecessary to check the deflection of
the drive belt periodically because your
engine is equipped with an automatic belt
tension adjuster. However, replacement of
the belt should be done according to the
maintenance schedule in the “Warranty
and Maintenance Booklet ”. Consult your
SUBARU dealer for replacement.
If the drive belt is loose, cracked or worn,
contact your SUBARU dealer.
Manual transmission oil
It is not necessary to check the transmis-
sion oil level. Check that there are no
cracks, damage or leakage. However, the
oil inspection should be performed ac-
cording to the maintenance schedule in
the “Warranty and Maintenance Booklet ”.
Consult your SUBARU dealer for details.
& Recommended grade and
viscosity
Each oil manufacturer has its own base
oils and additives. Never use different
brands together. For details, refer to
“Manual transmission, front differential
and rear differential gear oil ”F 12-6.
11-14

Continuously variable trans-
mission fluid
It is not necessary to check the transmis-
sion fluid level. Check that there are no
cracks, damage or leakage. However, the
fluid inspection should be performed
according to the maintenance schedule
in the“Warranty and Maintenance Book-
let ”. Consult your SUBARU dealer for
details.
Front differential gear oil
(CVT models)
It is not necessary to check the gear oil
level. Check that there are no cracks,
damage or leakage. However, the oil
inspection should be performed according
to the maintenance schedule in the
“ Warranty and Maintenance Booklet ”.
Consult your SUBARU dealer for details.
& Recommended grade and
viscosity
Each oil manufacturer has its own base
oils and additives. Never use different
brands together. For details, refer to
“Manual transmission, front differential
and rear differential gear oil ”F 12-6.
CAUTION
Using a differential gear oil other
than the specified oil may cause a
decline in vehicle performance.
Rear differential gear oil
It is not necessary to check the gear oil
level. Check that there are no cracks,
damage or leakage. However, the oil
inspection should be performed according
to the maintenance schedule in the
“Warranty and Maintenance Booklet” .
Consult your SUBARU dealer for details.
& Recommended grade and
viscosity
Each oil manufacturer has its own base
oils and additives. Never use different
brands together. For details, refer to
“Manual transmission, front differential
and rear differential gear oil ”F 12-6.
CAUTION
Using a differential gear oil other
than the specified oil may cause a
decline in vehicle performance.
Maintenance and service/Continuously variable transmission fluid11-15

Maintenance and service/Brake fluid
Brake fluid
&Checking the fluid level
WARNING
. Never let brake fluid contact your
eyes because brake fluid can be
harmful to your eyes. If brake
fluid gets in your eyes, immedi-
ately flush them thoroughly with
clean water. For safety, when
performing this work, wearing
eye protection is advisable.
. Brake fluid absorbs moisture
from the air. Any absorbed moist-
ure can cause a dangerous loss
of braking performance.
. If the vehicle requires frequent
refilling, there may be a leak. If
you suspect a problem, have the
vehicle checked at your SUBARU
dealer.
CAUTION
. When adding brake fluid, be care-
ful not to allow any dirt into the
reservoir.
. Never splash the brake fluid over
painted surfaces or rubber parts. Alcohol contained in the brake
fluid may damage them.
. Be careful not to spill brake fluid
when adding it. If brake fluid
touches the exhaust pipe, it may
cause a bad smell, smoke, and/or
a fire. If brake fluid gets on the
exhaust pipe, be sure to wipe it
off.
1) “MAX ”level line
2) “MIN ”level line
A) The brake fluid level must be checked in this area.
Check the fluid level monthly.
Check the fluid level on the outside of the
reservoir. Be sure to check the fluid level
for the brake system at the front part of
the reservoir (shaded area in the illustra- tion). For MT models, this reservoir is
used for both the brake and clutch
systems and has chambers for each
system.
If the fluid level is below
“MIN”, add the
recommended brake fluid to “MAX”. Use
only brake fluid from a sealed container.
& Recommended brake fluid
Refer to “Fluids ”F 12-7.
CAUTION
Never use different brands of brake
fluid together. Also, avoid mixing
DOT 3 and DOT 4 brake fluids even if
they are the same brand.
11-16

Clutch fluid (MT models)
&Checking the fluid level
WARNING
Never let clutch fluid contact your
eyes because clutch fluid can be
harmful to your eyes. If clutch fluid
gets in your eyes, immediately flush
them thoroughly with clean water.
For safety, when performing this
work, wearing eye protection is
advisable.
CAUTION
. Clutch fluid absorbs moisture
from the air. Any absorbed moist-
ure can cause improper clutch
operation.
. If the vehicle requires frequent
refilling, there may be a leak. If
you suspect a problem, have the
vehicle checked at your SUBARU
dealer.
. When clutch fluid is added, be
careful not to allow any dirt into
the tank.
. Never splash the clutch fluid over
painted surfaces or rubber parts. Alcohol contained in the clutch
fluid may damage them.
. Be careful not to spill clutch fluid
when adding it. If clutch fluid
touches the exhaust pipe, it may
cause a bad smell, smoke, and/or
a fire. If clutch fluid gets on the
exhaust pipe, be sure to wipe it
off.
. The fluid level for the clutch
system must be checked at the
inboard side of the reservoir. It
cannot be checked at the out-
board side of the reservoir.
1) “MAX ”level line
2) “MIN ”level line
A) The clutch fluid level must be checked in this area.
Check the fluid level monthly.
Check the fluid level on the outside of the
reservoir. Because this reservoir is used
for both the brake and clutch systems and
has chambers for each system, be sure to
check the fluid level for the clutch system
at the inboard side of the reservoir
(shaded area in the illustration). If the fluid
level is below “MIN ”,addtherecom-
mended clutch fluid to “MAX”.
Use only clutch fluid from a sealed
container.
& Recommended clutch fluid
Refer to “Fluids ”F 12-7.
CAUTION
Never use different brands of clutch
fluid together. Also, avoid mixing
DOT 3 and DOT 4 brake fluids even if
they are the same brand.
Maintenance and service/Clutch fluid (MT models)11-17

Maintenance and service/Brake booster
Brake booster
If the brake booster does not operate as
described in the following, have it checked
by your SUBARU dealer.
1. With the ignition switch in the“LOCK” /
“ OFF ”position, depress the brake pedal
several times, applying the same pedal
force each time. The distance the pedal
travels should not vary.
2. With the brake pedal depressed, start
the engine. The pedal should move
slightly down to the floor.
3. With the brake pedal depressed, stop
the engine and keep the pedal depressed
for 30 seconds. The pedal height should
not change.
4. Start the engine again and run for
approximately one minute then turn it off.
Depress the brake pedal several times to
check the brake booster. The brake
booster operates properly if the pedal
stroke decreases with each depression.
Brake pedal
Check the brake pedal free play and
reserve distance according to the main-
tenance schedule in the “Warranty and
Maintenance Booklet ”.
&Checking the brake pedal
free play
1) 0.02 –0.11 in (0.5 –2.7 mm)
Turn the ignition switch to the “LOCK”/
“OFF ”position and firmly depress the
brake pedal several times. Lightly pull
the brake pedal up with one finger to
check the free play with a force of less
than 2 lbf (10 N, 1 kgf).
If the free play is not within proper
specification, contact your SUBARU deal- er.
&
Checking the brake pedal
reserve distance
1) More than 2.56 in (65 mm)
Depress the pedal with a force of approxi-
mately 66 lbf (294 N, 30 kgf) and measure
the distance between the upper surface of
the pedal pad and the floor.
When the measurement is smaller than
the specification, or when the pedal does
not operate smoothly, contact with your
SUBARU dealer.
11-18

Clutch pedal (MT models)
Check the clutch pedal free play and
reserve distance according to the main-
tenance schedule in the“Warranty and
Maintenance Booklet ”.
&Checking the clutch function
Check the clutch engagement and disen-
gagement.
1. With the engine idling, check that there
are no abnormal noises when the clutch
pedal is depressed, and that shifting into
1st or reverse feels smooth.
2. Start the vehicle by releasing the pedal
slowly to check that the engine and
transmission smoothly couple without
any sign of slippage.
&Checking the clutch pedal
free play
1) 0.16 –0.43 in (4.0 –11.0 mm)
Lightly depress the clutch pedal down with
your finger until you feel resistance, and
check the free play.
If the free play is not within proper
specification, contact your SUBARU deal-
er.
Hill start assist system
Ensure that the Hill start assist system
operates properly under the following
circumstances.
1. Stop the vehicle on an uphill grade by
depressing the brake pedal (all models)
and clutch pedal (MT models only), with
the engine running.
2. Make sure that the vehicle does not
move backward for several seconds after
the brake pedal is released.
3. Then make sure the vehicle starts
climbing the grade by following the normal
starting procedures.
If the Hill start assist system does not
operate as described above, contact your
SUBARU dealer.
Maintenance and service/Clutch pedal (MT models)11-19

Maintenance and service/Replacement of brake pad and lining
Replacement of brake pad
and lining
The disc brakes have audible wear
indicators on the brake pads. If the brake
pads wear close to their service limit, the
wear indicator makes a very audible
scraping noise when the brake pedal is
applied.
If you hear this scraping noise each time
you apply the brake pedal, have the brake
pads serviced by your SUBARU dealer as
soon as possible.
CAUTION
If you continue to drive despite the
scraping noise from the audiblebrake pad wear indicator, it will
result in the need for costly brake
rotor repair or replacement.
&
Breaking-in of new brake
pads and linings
When replacing the brake pad or lining,
use only genuine SUBARU parts. After
replacement, the new parts must be
broken in as follows.
! Brake pad and lining
While maintaining a speed of 30 to 40
mph (50 to 65 km/h), step on the brake
pedal lightly. Repeat this five or more
times.
! Parking brake lining
1. Drive the vehicle at a speed of
approximately 22 mph (35 km/h).
2. With the parking brake release button
pushed in, pull the parking brake lever
SLOWLY and GENTLY (pulling with a
force of approximately 33.7 lbf [150 N,
15.3 kgf]).
3. Drive the vehicle for approximately
220 yards (200 meters) in this condition.
4. Wait 5 to 10 minutes for the parking
brake to cool down. Repeat this proce-
dure.
5. Check the parking brake stroke. If the parking brake stroke is out of the specified
range, adjust it by turning the adjusting nut
located on the parking brake lever.
Parking brake stroke:
7–8 notches / 45 lbf (200 N, 20.4 kgf)
WARNING
A safe location and situation should
be selected for break-in driving.
CAUTION
Pulling the parking brake lever too
forcefully may cause the rear
wheels to lock. To avoid this, be
certain to pull the lever up slowly
and gently.
11-20