Air Bleeding - Subaru IMPREZA 2002 Service Manual

AIR BLEEDING
BRAKE
15.Air Bleeding
A: PROCEDURE
CAUTION:
The FMVSS No. 116, fresh DOT3 or 4 brake
fluid must be used.
Cover the bleeder with waste cloth when
loosening it to prevent brake fluid from being
splashed over surrounding parts.
Avoid mixing different brands of brake fluid
to prevent degrading the quality of the fluid.
Be careful not to allow dirt or dust to get into
the reservoir tank.
NOTE:
Start with the brakes (wheels) connected to the
secondary chamber of the master cylinder.
The time interval between two brake pedal oper-
ations (from the time when the pedal is released to
the time when it is depressed another time) shall be
approximately 3 seconds.
The air bleeder on each brake shall be released
for 1 to 2 seconds.
1.
MASTER CYLINDER
NOTE:
If the master cylinder is disassembled or reser-
voir tank is empty, bleed the master cylinder.
During the bleeding operation, keep the brake
reservoir tank filled with brake fluid to eliminate en-
try of air.
Brake pedal operating must be very slow.
For convenience and safety, two people should
do the work.
1) Disconnect the brake line at primary and sec-
ondary sides.
2) Cover the master cylinder with vinyl bag.
3) Carefully depress and hold the brake pedal.
S4M0.540
4) Close the outlet plug with your finger, and re-
lease the brake pedal.
I
S4M0541
5) Repeat the above step3) and 4) until brake fluid
is completey bled from outlet plug.
6) Remove the vinyl bag, then connect the brake
pipe to master cylinder.
Tightening torque:
7) Using water, wash off the spilt brake fluid at the
master cylinder surrounding, then wipe up the wa-
ter.
8) Bleed air from the brake line. <Ref. to BR-46,
BRAKE LINE, PROCEDURE, Air Bleeding.>
2.
BRAKE LINE
NOTE:
During the bleeding operation, keep the brake
reservoir tank filled with brake fluid to eliminate en-
try of air.
Brake pedal operating must be very slow.
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.
8 N-m (0.8 kgf-m, 5.8 ff-lb)
S4M0246
W
BR-46