Subaru 2002 IMPREZA Service Manual page 2336

BRAKE
2) Fit one end of vinyl tube into the air bleeder and
put the other end into a brake fluid container.
CAUTION:
Brake fluid replacement sequence; (A) Front
right → → → → (B) Rear left → → → → (C) Front left → → → → (D) Rear
right
(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:
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)
AIR BLEEDING
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.
S4M0246
The difference between the two measurements
must be more than specified.
S4M0475A
Specified pedal stroke:
Without ABS
With ABS
When depressing brake pedal with a 490 N
(50 kg, 110 lb) 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. (With ABS)
<Ref. to ABS-11, ABS Sequence Control.>
9) Recheck the brake 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.
12) As a final step, test run the vehicle at low speed
and apply brakes relatively hard 2 to 3 times to en-
sure that brakes provide normal braking action on
all four wheels without dragging and uneven brak-
ing.
BR-58
(1) Steering wheel
(2) Toe board
90 mm (3.54 in)
95 mm (3.74 in)
S4M0476A