2009 SUBARU TRIBECA Service Workshop Manual

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Page 737 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual BR-23
Rear Disc Brake Assembly
BRAKE
4) Remove the piston seal from caliper body cylin-
der.
CAUTION:
Do not damage the cylinder and piston seal
groove.
5) Remove the lock pin sleeve and boot from ca

Page 738 of 2453

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

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

Page 739 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual BR-25
Master Cylinder
BRAKE
11) While pushing-in the primary piston, install the
C-ring to the groove using pliers.
CAUTION:
Make sure the C-ring is installed to the groove
securely.
12) Install the

Page 740 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual BR-26
Brake Booster
BRAKE
9. Brake Booster
A: REMOVAL
1) Remove or disconnect the following parts in the
engine compartment.
(1) Remove the brake master cylinder.
(2) Disconnect the vacuum hose fr

Page 741 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual BR-27
Brake Booster
BRAKE
B: INSTALLATION
1) Check and adjust the operating rod of the brake
booster.
Specification L:
137.6 mm (5.42 in)
If it is out of specification, adjust it with the br

Page 742 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual 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 stro

Page 743 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual BR-29
Brake Booster
BRAKE
Air tightness check
1) Start the engine and keep it running until vacu-
um pressure indicates point A of the vacuum gage
= 66. 7 kPa (500 mmHg, 19. 69 inHg). Do not de

BR-29
Brake Booster
BRAKE
Air tightness check
1) Start the engine and keep it running until vacu-
um pressure indicates point A of the vacuum gage
= 66. 7 kPa (500 mmHg, 19. 69 inHg). Do not de-
press the brake pedal at this time.
2) Stop the engine and check the gauge. If the vac-
uum pressure drop within 15 seconds after stop-
ping the engine is less than 3. 3 kPa (25 mmHg, 0.
98 inHg), the function of brake booster is normal.
If faulty, the cause may be one of the following.
•Check valve malfunction
•Leak from vacuum hose
•Leak from shell joint section or stud bolt welded
section
•Damaged diaphragm
•Leak from valve body seal and bearing section
•Leak from plate and seal assembly section
•Leak from poppet valve assembly section
Loaded air tightness check
1) Start the engine and depress the brake pedal
with a pedal force of 196 N (20 kgf, 44 lb). Keep the
engine running and keep the pedal pressed until a
vacuum of point B = 66. 7 kPa (500 mmHg, 19. 69
inHg) is indicated on the vacuum gauge.
2) Stop the engine and check the vacuum gauge.
If the vacuum pressure drop within 15 seconds af-
ter stopping the engine is less than 3.3 kPa (25
mmHg, 0.98 inHg), the function of brake booster is
normal.
If defective, refer to “AIR TIGHTNESS CHECK”.

3) If the brake booster is faulty, replace the it with a
new part.
Lack of boost action check
Turn the engine OFF, and set the value of the vac-
uum gauge to “0”. Then, check the fluid pressure
when the brake pedal is depressed. The pressure
must be greater than the specification listed.
Boosting action check
Set the vacuum gauge reading to 66. 7 kPa (500
mmHg, 19. 69 inHg) with the engine running. Then,
check the fluid pressure when the brake pedal is
depressed. The pressure must be greater than the
specification listed.
(1) Pressure gauge
(2) Vacuum gauge
(1) Pressure gauge
(2) Vacuum gauge
(3) Pedal force gauge
(4) Depressed
(1) (2)A
BR-00083
B(1) (2)
(3)
(4)
BR-00084
Brake pedal operation force
N (kgf, lb)
147
(15, 33)
294
(30, 66)
Fluid pressure
kPa (kgf/cm2, psi)
590
(6, 86)
1,654
(17, 240)
Brake pedal operation force
N (kgf, lb)
147
(15, 33)
294
(30, 66)
Fluid pressure
kPa (kgf/cm2, psi)
38,539
(87, 1,238)
15,373
(157, 2,229)

Page 744 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual 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

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