Air Bleeding - Subaru Legacy 2002 Service Manual

12. Air Bleeding

A: PROCEDURE
CAUTION:
¼ The FMVSS No. 116, fresh DOT3 or 4 brake
fluid must be used.
¼ Cover bleeder with waste cloth when loosen-
ing it to prevent brake fluid from being
splashed over surrounding parts.
¼ Avoid mixing different brands of brake fluid
to prevent degrading the quality of the fluid.
¼ Be careful not to allow dirt or dust to get into
the reservoir tank.
¼ Be extremely careful not to spill brake fluid.
Brake fluid spilt on the vehicle body will harm
the painted surface; wash it off quickly if spilt.
NOTE:
¼ Start with the brakes (wheels) connected to the
secondary chamber of the master cylinder.
¼ The time interval between two brake pedal
operations (from the time when the pedal is
released to the time when it is depressed another
time) should be approximately 3 seconds.
¼ The air bleeder on each brake should be
released for 1 to 2 seconds.
1. MASTER CYLINDER
NOTE:
¼ If master cylinder is disassembled or reservoir
tank is empty, bleed master cylinder.
¼ During bleeding operation, keep the brake res-
ervoir tank filled with brake fluid to eliminate entry
of air.
¼ Brake pedal operation must be very slow.
¼ For convenience and safety, two people should
do the work.
1) Loosen wheel nuts, jack-up vehicle, support it
with safety stands, and remove wheel.
2) Disconnect brake line at primary and secondary
sides.
3) Put plastic bag cover on the master cylinder.
4) Carefully depress and hold brake pedal.
5) Close outlet plug with your finger, and release
brake pedal.
AIR BLEEDING
S405163
S405163E45
S405163E4501
S4M0540
6) Repeat above steps 4) and 5) until master cyl-
inder is completely bled.
7) Install brake pipes to master cylinder.
Tightening torque:
8 N·m (0.8 kgf-m, 5.8 ft-lb)
8) Cleanly wash away brake fluid spilt on master
cylinder etc.
9) Bleed air from brake system. <Ref. to BR-43,
BRAKE LINE, PROCEDURE, Air Bleeding.>
2. BRAKE LINE
NOTE:
¼ During bleeding operation, keep the brake res-
ervoir tank filled with brake fluid to eliminate entry
of air.
¼ Brake pedal operation must be very slow.
¼ For convenience and safety, two people should
do the work.
1) Make sure that there is no leak from joints and
connections of the brake system.
2) Fit one end of vinyl tube into the air bleeder and
put the other end into a brake fluid container.
BR-43
S4M0541
S405163E4502
S4M0246
Brake