Subaru Impreza 2004 Service Manual page 64

CAUTION:
Brake fluid replacement sequence; (A) Front
right → → → → (B) Rear left → → → → (C) Front left → → → → (D) Rear
right
(A)
(1)
(2)
(C)
(1) Master cylinder
(2) Hydraulic unit
(3) Proportioning valve
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 waste cloth, when loos-
ening it, to prevent brake fluid from being
splashed over surrounding parts.
NOTE:
If caliper has two air bleeder screws, bleed air from
inner first, then outer.
(2)
(1) Inner air bleeder screw
(2) Outer air bleeder screw
4) Tighten the air bleeder securely when no air
bubbles are visible.
Air Bleeding
(D)
(3)
(B)
BR-00089
(1)
BR-00376
Air bleeder tightening torque:
Except for 17 inch type:
8 N·m (0.8 kgf-m, 5.8 ft-lb)
17 inch type:
20 N·m (2.0 kgf-m, 14.5 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.
20 seconds to make sure that there is no leak evi-
dent in the entire system.
6) Check the pedal stroke.
While the engine is idling, depress the brake pedal
with a 490 N (50 kgf, 110 lb) load and measure the
distance between brake pedal and steering wheel.
With the brake pedal released, measure the dis-
tance between pedal and steering wheel again.
The difference between the two measurements
must not be more than specified.
(2)
(1) Steering wheel
(2) Toe board
Specified pedal stroke
90 mm (3.54 in)
When depressing brake pedal with a 490 N
(50 kgf, 110 lbf) load.
7) If the distance is more than the specifications,
there is a possibility that air is in the brake line.
Bleed the brake line until pedal stroke meets the
specification.
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 specifications,
there is a possibility air is in the inside of hydraulic
unit. Repeat above steps 2) to 9) above until pedal
stroke meets the specification.
11) Add brake fluid to the required level (MAX. lev-
el) of reservoir tank.
BR-63
BRAKE
(1)
1
2
1 2
BR-00094