Subaru 2004 LEGACY, Service Manual

Page: 498 / 609

BR-39
BRAKE
Air Bleeding
3) Slowly depress the brake pedal and keep it de-
pressed. Then, open the air bleeder to discharge
air together with the fluid.
Release the air bleeder for 1 to 2 seconds.
Next, with the bleeder closed, slowly release the
brake pedal.
Repeat these steps until there are no more air bub-
bles in the vinyl tube.
Allow 3 to 4 seconds between two brake pedal op-
erations.
CAUTION:
Cover the bleeder with cloth, when loosening it,
to prevent brake fluid from being splashed over
surrounding parts.
NOTE:
The brake pedal operating must be very slow.
4) Tighten the air bleeder securely when no air
bubbles are visible.
Air bleeder tightening torque:
8 N
⋅
m (0.8 kgf-m, 5.8 ft-lb)
5) Perform these steps for the brakes connecting to
secondary chamber of master cylinder first, and
then for the ones connecting to primary chamber.
With all procedures completed, fully depress the
brake pedal and keep it in that position for approx-
imately 20 seconds to make sure that there is no
leak evident in the entire system.
6) Check the pedal stroke.
While the engine is idling after warming up, de-
press the brake pedal with a 500 N (51 kgf, 112 lb)
load and measure the distance between brake ped-
al and steering wheel. With the brake pedal re-
leased, measure the distance between pedal and
steering wheel again. The difference between the
two measurements must not be more than speci-
fied value.
Specified pedal stroke:
95 mm (3.74 in) or less
When depressing brake pedal with a 500 N
(51 kgf, 112 lb) load.
7) If the distance is more than specified, there is a
possibility that air is in the brake line. Bleed the
brake line until pedal stroke meets the specifica-
tion.
8) Operate the hydraulic control unit in the se-
quence control mode. <Ref. to ABS-10, ABS Se-
quence Control.>
9) Recheck the pedal stroke.
10) If the distance is more than specified, there is a
possibility that air is in the inside of the hydraulic
unit. Repeat above steps 2) to 9) until pedal stroke
meets the specification.
11) Add brake fluid to the required level (“MAX” lev-
el) of reservoir tank.
12) As a final step, test run the vehicle at low speed
and ensure that brakes provide normal braking ac-
tion.
(1) Steering wheel
(2) Toe board
(1)
(2)
BR-00094
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2
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