air bleeding SUBARU TRIBECA 2009 1.G Service Workshop Manual

BR-24
Master Cylinder
BRAKE
8. Master Cylinder
A: REMOVAL
CAUTION:
Do not allow brake fluid to come in contact with
vehicle body. If it does, wash off with water and
wipe away completely.
1) Drain brake fluid from the reservoir tank com-
pletely.
2) Disconnect the harness connector of the fluid
level gauge.
3) Remove the brake pipe from the master cylinder.
4) Remove the master cylinder mounting nuts, and
remove the master cylinder from the brake booster.
B: INSTALLATION
1) Install in the reverse order of removal.
Tightening torque:
Master cylinder mounting nut
25 N·m (2.5 kgf-m, 18.4 ft-lb)
Brake pipe
19 N·m (1.9 kgf-m, 14.0 ft-lb)
CAUTION:
Be sure to use recommended brake fluid.
2) Bleed air from brake system. PROCEDURE, Air Bleeding.>
C: REPLACEMENT
1) Remove mud and dirt from the surface of brake
master cylinder.
2) Secure the master cylinder in a vise.
NOTE:
To avoid damaging the master cylinder, place be-
tween aluminum plates or other material when
holding with a vise.
3) Remove the pin which secures the master cylin-
der and reservoir tank, then remove the reservoir
tank and seal.
4) While pushing in the primary piston, remove the
C-ring using pliers.
5) While pushing in the primary piston, remove the
straight pin from the port on the reservoir tank at-
tachment location using a magnet pick-up tool.
6) Extract the primary piston assembly and sec-
ondary piston assembly straight out while taking
care not to scratch the inner surface of the cylin-
ders.
7) Clean the inside of master cylinder with brake
fluid. Check the inside of the cylinder for damage,
deformation and wear. Replace the master cylinder
as assembly if faulty.
8) Apply brake fluid to the inner surface of master
cylinder and piston assembly.
9) Make sure that the inner surface of master cylin-
der and the piston assembly are free of foreign
matter. Install the primary piston assembly and the
secondary piston assembly to master cylinder,
while taking care not to scratch the master cylinder
inner surface.
10) While pushing-in the primary piston, install the
cylinder pin.
BR-00499
(1) Straight pin
BR-00169
(1)
BR-00069

BR-28
Brake Booster
BRAKE
Air tightness check
Start the engine, and idle it for 1 to 2 minutes, then
turn it OFF. Depress the brake pedal several times
applying the normal pedal force. The pedal stroke
should be the longest at the 1st depression, and it
should become shorter at each successive depres-
sion. If no change occurs in the pedal height when
pressed, the brake booster is faulty.
NOTE:
•In case of defective operation, inspect the condi-
tion of the check valve and vacuum hose as well.
•Replace them if faulty, and perform the test
again.
•If the defective condition is not improved, check
accurately using a gauge.
Operation check
1) While the engine is OFF, depress the brake ped-
al several times applying the same pedal force, to
check for a change in pedal height.
2) With the brake pedal pressed, start the engine.
3) As the engine starts, the brake pedal should
move slowly toward the floor. If the pedal height
does not change, the brake booster is faulty.
NOTE:
If faulty, perform an accurate check with a gauge.
Loaded air tightness check
Depress the brake pedal while the engine is run-
ning, and turn the engine OFF while the pedal is de-
pressed. Keep the pedal depressed for 30
seconds. If the pedal height does not change, the
function of brake booster is normal. If the pedal
height increases, it is faulty.
NOTE:
If faulty, perform an accurate check with a gauge.
2. OPERATION CHECK (WITH GAUGE)
CAUTION:
When checking operation, be sure to apply the
parking brake securely.
Check with gauge
Connect the gauge as shown in the figure. After
bleeding air from the pressure gauge, perform the
checks.
(1) Normal
(2) Not OK
(3) 1st
(4) 2nd
(5) 3rd
(1) When engine is stopped
(2) When engine is started
(1)
(3)(4)
(5)
(2)
BR-00080
(1) (2)
BR-00081
(1) Pressure gauge
(2) Vacuum gauge
(3) Adapter hose
(4) Vacuum hose
(5) Pedal force gauge
(1) (2)
(3) (4) (5)
BR-00082

BR-30
Brake Fluid
BRAKE
10.Brake Fluid
A: INSPECTION
1) Check that the brake fluid level is between “MIN”
and “MAX”. If out of the specified range, refill or
drain fluid. If the fluid level is close to “MIN”, check
the brake pad for wear and refill the fluid.
2) Check the fluid for discoloration. If the fluid color
has changed excessively, drain the fluid and refill
with new fluid.
B: REPLACEMENT
CAUTION:
•Do not let brake fluid come into contact with
the painted surface of the vehicle body. Wash
away with water immediately and wipe off if it is
spilled by accident.
•Avoid mixing brake fluids of different brands
to prevent fluid performance from degrading.
•Be careful not to allow dirt or dust to enter the
reservoir tank.
NOTE:
•During the operation, keep the reservoir tank
filled with brake fluid to eliminate entry of air.
•Operate the brake pedal slowly.
•For convenience and safety, perform work with 2
people.
•The required amount of brake fluid is approxi-
mately 600 m2 (20 US fl oz, 21 Imp fl oz) for entire
brake system.
1) Lift-up the vehicle and set rigid racks at the spec-
ified locations, or keep the vehicle lifted.
2) Remove both the front and rear wheels.
3) Drain brake fluid from the reservoir tank.
4) Refill the reservoir tank with the recommended
brake fluid.
Recommended brake fluid:
Refer to the specification. SPECIFICATION, General Description.>
Perform the same procedure as for bleeding the
brake line, until new brake fluid comes out from vi-
nyl tube. ing.>
NOTE:
Perform the brake fluid replacement starting in or-
der from the farthest wheel cylinder from the mas-
ter cylinder.

BR-31
Air Bleeding
BRAKE
11.Air Bleeding
A: PROCEDURE
CAUTION:
•Do not let brake fluid come into contact with
the painted surface of the vehicle body. Wash
away with water immediately and wipe off if it is
spilled by accident.
•Avoid mixing brake fluids of different brands
to prevent fluid performance from degrading.
•Be careful not to allow dirt or dust to enter the
reservoir tank.
1. MASTER CYLINDER
NOTE:
•When the master cylinder is disassembled or the
reservoir tank is empty, bleed the master cylinder.
•If bleeding of the master cylinder is not neces-
sary, omit the following procedures, and perform
bleeding of the brake line. LINE, PROCEDURE, Air Bleeding.>
1) Fill the reservoir tank of the master cylinder with
brake fluid.
NOTE:
While bleeding air, keep the reservoir tank filled
with brake fluid to prevent entry of air.
2) Disconnect the brake line at primary and sec-
ondary sides.
3) Wrap the master cylinder with a plastic bag.
4) Depress the brake pedal slowly and hold it.
5) Plug the outlet plug with your finger, and then re-
lease the brake pedal.
6) Repeat the step 4) and 5) several times.
7) Remove the plastic bag.
8) Install the brake pipe to the master cylinder.
Tightening torque:
19 N·m (1.9 kgf-m, 14.0 ft-lb)
9) Bleed air from the brake line. BRAKE LINE, PROCEDURE, Air Bleeding.>
2. BRAKE LINE
1) When the master cylinder is disassembled or the
reservoir tank is empty, bleed the master cylinder
before bleeding the brake line. MASTER CYLINDER, PROCEDURE, Air Bleed-
ing.>
2) Fill the reservoir tank of the master cylinder with
brake fluid.
NOTE:
While bleeding air, keep the reservoir tank filled
with brake fluid to prevent entry of air.
3) Attach one end of the vinyl tube to the air bleeder
and the other end to the brake fluid container.
4) Depress the brake pedal several times, and
keep it pressed.
5) Loosen the air bleeder screw to drain brake fluid.
Tighten the air bleeder quickly, and release the
brake pedal.
6) Repeat the steps 4) to 5) until there are no more
air bubbles in the vinyl tube.
7) Repeat the steps from 2) to 6) above to bleed air
from each wheel.
NOTE:
Perform the operation in the order from closest
wheel cylinder to the master cylinder.
8) Securely tighten the air bleeder screws.
Tightening torque:
8 N·m (0.8 kgf-m, 5.8 ft-lb)
9) Check that there are no brake fluid leaks in the
entire system.
BR-00090
BR-00091
BR-00087

BR-32
Air Bleeding
BRAKE
10) Check the pedal stroke.
Run the engine at idle after warming up the engine,
and depress the brake pedal with a force of 500 N
(51 kgf, 112 lb). Measure the distance between the
brake pedal and steering wheel. Release the pedal,
and measure the distance between pedal and
steering wheel again.
Specification of pedal stroke:
When depressing the pedal with a force of
500 N (51 kgf, 112 lb).
Less than 115 mm (4.53 in)
11) If the distance is more than specification, there
is a possibility of air being caught in the brake line.
Bleed the brake line of all air until the pedal stroke
meets the specification.
12) Operate the hydraulic control unit in the se-
quence control mode. quence Control.>
13) Check the pedal stroke again.
14) If the distance is more than specification, there
is a possibility of air being caught in the hydraulic
unit. Repeat above steps 2) to 9) until the pedal
stroke meets the specification.
15) Fill brake fluid up to the “MAX” level of the res-
ervoir tank.
16) Test run the vehicle and ensure that the brakes
operate normally.
(1) Steering wheel
(2) Toe board
(1)
(2)
BR-00094
1
2
21

CO(H6DO)-10
Engine Coolant
COOLING
3. Engine Coolant
A: REPLACEMENT
1. DRAINING OF ENGINE COOLANT
1) Lift-up the vehicle.
2) Remove the under cover.
3) Remove the drain plug to drain engine coolant
into container.
NOTE:
Remove the radiator cap so that engine coolant will
drain faster.
4) Install the drain plug.
2. FILLING OF ENGINE COOLANT
1) Pour cooling system conditioner through the fill-
er neck.
Cooling system protective agent:
COOLING SYSTEM CONDITIONER (Part No.
SOA345001)
2) Pour engine coolant into the radiator up to the
filler neck position.
Coolant level:
Refer to “SPECIFICATION” for the engine
coolant capacity. SPECIFICATION, General Description.>
NOTE:
The SUBARU Genuine Coolant containing anti-
freeze and anti-rust agents is especially made for
SUBARU engine, which has an aluminum crank-
case. Always use SUBARU Genuine Coolant,
since other coolant may cause corrosion.
3) Open the air bleeding valve on the heater hose
side.
4) If the engine coolant level drops, add engine
coolant into radiator up to the filler neck position.
5) When engine coolant has come out from the air
bleeding valve on the heater hose side, close the
valve.
6) Open the air bleeding valve on the radiator side.
7) If the engine coolant level drops, add engine
coolant into radiator up to the filler neck position.
8) When engine coolant has come out from the air
bleeding valve on the radiator side, close the valve.
9) Fill engine coolant into the reservoir tank up to
“FULL” level.
10) Close the radiator cap and start the engine.
Race 5 to 6 times at less than 3,000 rpm, then stop
the engine. (Complete this operation within 40 sec-
onds.)
CO-02192
(1) FULL
(2) LOW
CO-02213
CO-02196
(1)
(2)

CO(H6DO)-11
Engine Coolant
COOLING
11) Wait for one minute after the engine stops,
open the radiator cap. If the engine coolant level
drops, add engine coolant into radiator up to the fill-
er neck position.
12) Perform the procedures 10) and 11) again.
13) Attach the radiator cap and reservoir tank cap
properly.
14) Start the engine and operate the heater at max-
imum hot position and the blower speed setting to
“LO.”
15) Run the engine at 2,000 rpm or less until radia-
tor fan starts and stops.
NOTE:
•Be careful with the engine coolant temperature
gauge to prevent overheating.
•If the radiator hose becomes harden with the
pressure of engine coolant, air bleeding operation
seems to be almost completed.
16) Stop the engine and wait until the engine cool-
ant temperature lowers to 30°C (86°F).
17) Open the radiator cap. If the engine coolant lev-
el drops, add engine coolant into radiator up to the
filler neck position and reservoir tank to the “FULL”
level.
18) Attach the radiator cap and reservoir tank cap
properly.
19) Set the heater setting to maximum hot position
and the blower speed setting to “LO” and start the
engine. Perform racing at less than 3,000 rpm. If
the flowing sound is heard at this time, perform the
procedures from 15) again.
B: INSPECTION
1. RELATIONSHIP OF SUBARU COOLANT
CONCENTRATION AND FREEZING TEM-
PERATURE
The concentration and safe operating temperature
of SUBARU coolant is shown in the diagram. Mea-
suring the temperature and specific gravity of the
coolant will provide this information.
[Example]
If the coolant temperature is 25°C (77°F) and its
specific gravity is 1.054, the concentration is 35%
(point A), the safe operating temperature is –14°C
(7°F) (point B), and the freezing temperature is –
20°C (–4°F) (point C).
CO-02172
60%
(1.054)
1.000
1.010
1.020
1.030
1.040
1.050
1.060
1.070
1.080
1.090
1.100
Safe operating temperature
Freezingtemperature
Concentrationof coolant
Specific gravityof coolant
Coolant temperature
B
A
C
-40(-40) (-22)(-4)(14)(32)(50) (68) (86)
( F)
(104)-30-20 -10010203040
(77 F)
50%
40%
30%
20%
25 C
10%
C

PM-21
Brake Fluid
PERIODIC MAINTENANCE SERVICES
14.Brake Fluid
A: REPLACEMENT
1) Either jack-up the vehicle and place a rigid rack
under it, or lift-up the vehicle.
2) Remove all the wheels.
3) Drain the brake fluid from master cylinder.
4) Refill the reservoir tank with recommended
brake fluid.
Recommended brake fluid:
Refer to “RM” section. RECOMMENDED MATERIALS, Recommend-
ed Materials.>
NOTE:
•Avoid mixing different brands of brake fluid to
prevent degrading the quality of fluid.
•Be careful not to allow dirt or dust to get into the
reservoir tank.
Bleeding sequence (1) → (2) → (3) →(4)
5) Install one end of a vinyl tube onto the air bleeder
and insert the other end of the tube into a container
to collect the brake fluid.
NOTE:
•Cover the bleeder with cloth, when loosening it,
to prevent brake fluid from being splashed over sur-
rounding parts.
•During air bleeding, keep the reservoir tank filled
with brake fluid to eliminate entry of air.
•Operate the brake pedal slowly.
•For convenience and safety, two people should
work together.
•The amount of brake fluid required is approx. 600
m2 (20.3 US fl oz, 21.1 Imp fl oz) for total brake
system.
6) Instruct your co-worker to depress the brake
pedal slowly two or three times and then hold it de-
pressed.
7) Loosen the bleeder screw approximately 1/4
turn until a small amount of brake fluid drains into
the container, and then quickly tighten the screw.
8) Repeat steps 6) and 7) until there are no air bub-
bles in drained brake fluid and new fluid flows
through vinyl tube.
NOTE:
Add brake fluid as necessary while bleeding air, so
that the brake fluid in the tank is always between
MAX and MIN.
9) After completing the bleeding operation, hold the
brake pedal depressed and tighten the screw and
install bleeder cap.
Tightening torque:
8 N·m (0.8 kgf-m, 5.8 ft-lb)
10) Bleed air from each wheel cylinder by following
steps from 5) to 9).
11) Depress the brake pedal with a force of approx.
294 N (30 kgf, 66 lb) and hold it there for approx. 20
seconds. At this time check the pedal to see if it
makes any unusual movement. Visually inspect the
bleeder screws and brake pipe joints to confirm
there is no fluid leakage.
12) Install the wheels, and drive the vehicle for a
short distance between 2 to 3 km (1 to 2 mile) to
confirm brakes are operating properly.
(1) Front RH
(2) Rear LH
(3) Front LH
(4) Rear RH
(5) Secondary
(6) Primary
(1) (4)
(2)(3)
(5) (6)
PM-00047
PM-00048