Subaru Legacy IV (2008 year). Manual - part 955

BR-32

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 fluid 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. <Ref. to BR-32, BRAKE
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 steps 4) and 5) several times.
7) Remove the plastic bag.

8) Install the brake pipe to the master cylinder.

Tightening torque:

Model with ABS

15 N·m (1.5 kgf-m, 10.8 ft-lb)

Model with VDC

19 N·m (1.9 kgf-m, 14.0 ft-lb)

9) Bleed air from the brake line. <Ref. to BR-32,
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. <Ref. to BR-32,
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 hold
it.
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 the farthest
wheel cylinder from 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-33

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 lbf).

95 mm (3.74 in) or less

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. <Ref. to ABS-10, ABS Se-
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 the reservoir tank with brake fluid up to the
“MAX” level.
16) Test run the vehicle and ensure that the brakes
operate normally.

(1) Steering wheel

(2) Toe board

(1)

(2)

BR-00094

1

2

2

1

BR-34

Brake Hose

BRAKE

12.Brake Hose

A: REMOVAL

1. FRONT BRAKE HOSE

1) Separate the brake pipe from brake hose using a
flare nut wrench.
2) Remove the clamp, the strut mount bolts, and
union bolt.

2. REAR BRAKE HOSE

1) Remove the union bolt from the rear brake cali-
per.

2) Separate the brake pipe from brake hose using a
flare nut wrench.

3) Remove the clamp, and then remove the brake
hose.

(1) Brake hose

(2) Brake pipe

(1) Brake hose

BR-00095

(1)

(2)

BR-00348

(1)

(1) Brake pipe

(2) Brake hose clamp

(1) Brake pipe

(2) Brake hose

(3) Brake hose clamp

(1)

BR-00349

(2)

BR-00350

(1)

(2)

(3)

BR-35

Brake Hose

BRAKE

B: INSTALLATION

1. FRONT BRAKE HOSE

1) Secure the brake hose to strut mount.

Tightening torque:

33 N·m (3.4 kgf-m, 24.3 ft-lb)

2) Install the brake hose to the caliper using a new
gasket.

Tightening torque (union bolt):

18 N·m (1.8 kgf-m, 13.0 ft-lb)

3) Position the disc in straight position and route
the brake hose through the hole in the bracket on
the wheel apron side.

CAUTION:
Do not twist the brake hose.
4) Temporarily tighten the flare nut which connects
brake pipe and hose.
5) Secure the brake hose to wheel apron bracket
with clamp.
6) Tighten the flare nut to the specified torque.

Tightening torque (brake pipe flare nut):

15 N·m (1.5 kgf-m, 10.8 ft-lb)

7) Bleed air from brake system.

2. REAR BRAKE HOSE

1) Route the brake hose through the hole of brack-
et, and lightly tighten the flare nut to connect brake
pipe.
2) Insert the clamp to secure brake hose.

3) Install the brake hose to rear brake caliper using
a new gasket.

Tightening torque (union bolt):

18 N·m (1.8 kgf-m, 13.0 ft-lb)

4) Tighten the flare nut to the specified torque.

Tightening torque (brake pipe flare nut):

15 N·m (1.5 kgf-m, 10.8 ft-lb)

5) Bleed air from the brake system.

C: INSPECTION

Make sure there are no cracks, breakage or dam-
age on hoses. Check the joint for fluid leakage. If
any cracks, breakage, damage or fluid leakage is
found, repair or replace the hose.

(1) Brake pipe

(2) Brake hose

(3) Brake hose clamp

BR-00021

BR-00350

(1)

(2)

(3)

(1) Brake pipe

(2) Brake hose clamp

(1) Brake hose

(1)

BR-00349

(2)

BR-00348

(1)