air bleeding SUBARU LEGACY 1997 Service Repair Manual

BRAKES
44

Page

S
SPECIFICATIONS
AND
SERVICE
DATA

1
.
Brakes

C
COMPONENT
PARTS
...........
.
.
.
.....................
.
.
......
..
.
.
.
..........................

1
.
FrontDisc
Brake

2
.
Rear
Disc
Brake

3
.
Rear
Drum
Brake

4
.
Master
Cylinder

5
.
Brake
Booster

6
.
ABS
System
7
.
Hill
Holder

8
.
Parking
(Hand)
Brake
9
.
ABS/TCS
System

10
.
ABS
System(ABS
5
.3i
Type)
...
....
.
...
..........................
.
.
...
.
.............

W
SERVICE
PROCEDURE
...............
.
.
......
.
.
...
.
....................
.
.
.
.
.
.
...
.
...
.
.......

1
.
Front
Disc
Brake
2
.
Rear
Disc
Brake

3
.
Rear
Drum
Brake
4
.
Parking
Brake
(Rear
Disc
Brake)
5
.
Master
Cylinder

6
.
Brake
Booster

7
.
Brake
Hose
8
.
Hill
Holder

9
.
Parking
Brake
Lever

10
.
Parking
Brake
Cable

11
.
Air
Bleeding
(Without
TCS
model)

12
.
Brake
Fluid
Replacement

13
.
Proportioning
Valve

14
.
ABS
Sensor

15
.
Hydraulic
Unit
for
ABS
System

16
.
ABS
Control
Module

17
.
G
Sensor
for
ABS
System

18
.
Brake
Hose
and
Pipe
am
.
.
.....
.
.................................
.
.
...
.
.....
..

19
.
Air
Bleeding
(With
TCS
model)

20
.
Hydraulic
Unit
for
ABS/TCS
System

21
.
ABS/TCS
Control
Module

22
.
Hydraulic
Unit
for
ABS
System
(ABS
5
.3
Type)

23
.
ABS
Control
Module
(ABS
5
.3
Type)

24
.
G
Sensor
for
ABS
System
(ABS
5
.3
Type)

25
.
ABS
Control
Module
and
Hydraulic
Control
Unit
(ABSCM&H/U)
[ABS
5
.3i
Type]
.
.
.
.
.
.
.
...
.
.
.
.
.
..
.
.
...................................
.
...
.
.
.........
..........
26
.
ABS
Sensor
(ABS
5
.3i
Type)
....
...........................................
.
.
....
.
...
.
27
G
Sensor
(ABS
5
3i
T
e)

2

....
.2

....
.4

........
.
.
..
.4

....
..
.15

....
..
.15
yp
....
.
.
......
...
.
...................................
.
.
.
.
.......
.
.
.....

K
DIAGNOSTICS

1
.
Entire
BrakeSystem

2
.
Hill
Holder

PRECAUTION
FORSUPPLEMENTAL
RESTRAINT
SYSTEM
"AIRBAG"
The
Supplemental
Restraint
System
"Airbag"
helps
to
reduce
the
risk
or
severity
of
injury
to
the
driver
in
a
frontal
collision
.
The
Supplemental
Restraint
System
consists
of
an
airbag
module
(located
in
the
center
of
the
steer-
ing
wheel),sensors,
a
control
module,warning
light,
wiring
harness
and
roll
connector
.
Information
necessary
to
servicethe
safety
is
included
in
the"5-5
.
SUPPLEMENTAL
RESTRAINT
SYSTEM"
ofthis
Service
Manual
.
WARNING
:
"
To
avoid
rendering
the
Airbag
system
inoperative,
which
could
lead
to
personal
injury
or
death
in
the
event
of
a
severe
frontal
collision,
all
maintenance
must
be
performed
byan
authorized
SUBARU
dealer
.
"
Improper
maintenance,
including
incorrect
removal
and
installation
of
the
Airbag
system,
can
lead
to
personal
injury
caused
by
unintentional
activation
of
the
Airbag
system
.
"
All
Airbag
system
electrical
wiring
harnesses
and
connectors
are
covered
with
yellow
outer
insu-
lation
.
Do
not
use
electrical
test
equipment
on
any
circuit
relatedtothe
Supplemental
Restraint
System
"Airbag"
.

G2M0198
4) Manually push valve rocker (at lash adjuster location) to
check that there is no air in it.
NOTE:
When air is in lash adjuster, valve rocker moves when
pushed with fingers.
G2M0199
5) If air is in lash adjuster, remove valve rocker assembly
from engine and bleed air completely.
B2M0382A
B: AIR BLEEDING
1) Remove valve rocker assembly.
(1) Remove bolts

1through
4in numerical
sequence.
CAUTION:
Leave two or three threads of bolt

1engaged to retain
valve rocker assembly.
(2) Equally loosen bolts

5through
8all the way,
being careful that knock pin is not gouged.
2) Manually remove lash adjusters where air is trapped.
CAUTION:
If lash adjuster is difficult to remove manually, use pli-
ers. Be careful not to scratch lash adjuster.
12
2-3SERVICE PROCEDURE
2. Hydraulic Lash Adjuster

G2M0131
3) Bleed air from hydraulic lash adjuster as described
below:
(1) While dipping hydraulic lash adjuster in engine oil,
as shown in Figure, push check ball in usinga2mm
(0.08 in) diameter round bar.
(2) With check ball pushed in, manually move plunger
up and down at one second intervals until air bubbles
disappear.
(3) After air bubbles disappear, remove round bar and
quickly push plunger in to ensure it is locked. If plunger
does not lock properly, replace hydraulic lash adjuster.
CAUTION:
Leave hydraulic lash adjuster (after air is bled) in
engine oil until it is ready for installation.
G2M0200
4) Using ST;
(1) Insert lash adjuster into ST, and fill ST with engine
oil. Usinga2mm(0.08 in) diameter rod, push check
ball in.
ST 499597000 OIL SEAL GUIDE
(2) With check ball pushed in, push plunger at an inter-
val of one second.
(3) Move plunger up and down until air bubbles are no
longer emitted from lash adjuster.
NOTE:
Hold hydraulic lash adjusters vertically during air bleeding.
5) Remove the rod. Push plunger to ensure that air is
completely bled out.
CAUTION:
If plunger does not properly lock (when pushed),
replace lash adjuster with a new one.
13
2-3SERVICE PROCEDURE
2. Hydraulic Lash Adjuster

6) Fill rocker arm’s oil reservoir with engine oil and install
lash adjuster.
CAUTION:
Do not rotate lash adjuster during installation.
Be careful not to scratch the oil seal.
B2M0414
CAUTION:
When removing valve rocker assembly, keep the
assembly soaked in engine oil, or position it with air
bleeding orifice on rocker arm facing upward as
shown. This prevents oil leakage from and air entering
into the hydraulic lash adjuster. Failure to do so may
cause air to enter the hydraulic lash adjuster, causing
loss in performance.
B2M0382B
7) Temporarily and equally tighten bolts
1through
4.Do
not allow knock pin to catch valve rocker assembly.
8) Tighten bolts

5through
8to specified torque.
9) Tighten bolts

1through
4to specified torque.
Tightening torque:
12±1 N⋅m (1.2±0.1 kg-m, 8.7±0.7 ft-lb)
10) Install rocker covers.
Tightening torque:
5±1 N⋅m (0.5±0.1 kg-m, 3.6±0.7 ft-lb)
11) Connect harness connectors, hoses, etc. to their posi-
tions.
14
2-3SERVICE PROCEDURE
2. Hydraulic Lash Adjuster

G2M0972
4) Tighten air bleeder.
Tightening torque:
T: 18±3 N⋅m (1.8±0.3 kg-m, 13.0±2.2 ft-lb)
B2M1178A
5) Remove air chamber.
<Ref. to 2-7 [W18A0].>
6) Repeat steps 1) through 3) using air bleeder on oper-
ating cylinder.
B2M1179A
7) Tighten air bleeder.
Tightening torque:
T: 18±3 N⋅m (1.8±0.3 kg-m, 13.0±2.2 ft-lb)
8) After depressing the clutch pedal, make sure that there
are no leaks evident in the entire system.
9) After bleeding air from system, ensure that clutch oper-
ates properly.
B2M0633A
3. Release Bearing and Lever
A: REMOVAL
1. MECHANICAL APPLICATION TYPE
1) Remove release lever return spring

1(Models without
hill holder only).
2) Remove the two clips

2from clutch release lever
3
and remove release bearing
6.
CAUTION:
Be careful not to deform clips.
3) Remove release lever seal

4.
8
2-10SERVICE PROCEDURE
2. On-Car Service - 3. Release Bearing and Lever

G2M0972
4) Tighten air bleeder.
Tightening torque:
T: 18±3 N⋅m (1.8±0.3 kg-m, 13.0±2.2 ft-lb)
B2M1178A
5) Remove air chamber.
<Ref. to 2-7 [W18A0].>
6) Repeat steps 1) through 3) using air bleeder on oper-
ating cylinder.
B2M1179A
7) Tighten air bleeder.
Tightening torque:
T: 18±3 N⋅m (1.8±0.3 kg-m, 13.0±2.2 ft-lb)
8) After depressing the clutch pedal, make sure that there
are no leaks evident in the entire system.
9) After bleeding air from system, ensure that clutch oper-
ates properly.
B2M0633A
3. Release Bearing and Lever
A: REMOVAL
1. MECHANICAL APPLICATION TYPE
1) Remove release lever return spring

1(Models without
hill holder only).
2) Remove the two clips

2from clutch release lever
3
and remove release bearing
6.
CAUTION:
Be careful not to deform clips.
3) Remove release lever seal

4.
8
2-10SERVICE PROCEDURE
2. On-Car Service - 3. Release Bearing and Lever

B2M1179C
4) Installation is in the reverse order of removal.
NOTE:
Before installing operating cylinder, apply grease (SUN-
LIGHT 2: P/N 003602010) to contact point of release lever
and operating cylinder.
Tightening torque:
T1: 18±3 N⋅m (1.8±0.3 kg-m, 13.0±2.2 ft-lb)
T2: 37±3 N⋅m (3.8±0.3 kg-m, 27.5±2.2 ft-lb)
5) After bleeding air from operating cylinder, ensure that
clutch operates properly.
<Ref. to 2-10 [W202].>
G2M0979
6. Master Cylinder and Reservoir Tank
A: REMOVAL
1) Remove snap pin
2, clevis pin
1and separate push
rod

3of master cylinder from clutch pedal.
B2M1260A
2) Remove clutch hose from master cylinder.
CAUTION:
Plug up hose connection to prevent clutch fluid from
spilling out.
B2M1261A
3) Remove master cylinder with reservoir tank.
16
2-10SERVICE PROCEDURE
5. Operating Cylinder - 6. Master Cylinder and Reservoir Tank

B2M1179C
4) Installation is in the reverse order of removal.
NOTE:
Before installing operating cylinder, apply grease (SUN-
LIGHT 2: P/N 003602010) to contact point of release lever
and operating cylinder.
Tightening torque:
T1: 18±3 N⋅m (1.8±0.3 kg-m, 13.0±2.2 ft-lb)
T2: 37±3 N⋅m (3.8±0.3 kg-m, 27.5±2.2 ft-lb)
5) After bleeding air from operating cylinder, ensure that
clutch operates properly.
<Ref. to 2-10 [W202].>
G2M0979
6. Master Cylinder and Reservoir Tank
A: REMOVAL
1) Remove snap pin
2, clevis pin
1and separate push
rod

3of master cylinder from clutch pedal.
B2M1260A
2) Remove clutch hose from master cylinder.
CAUTION:
Plug up hose connection to prevent clutch fluid from
spilling out.
B2M1261A
3) Remove master cylinder with reservoir tank.
16
2-10SERVICE PROCEDURE
5. Operating Cylinder - 6. Master Cylinder and Reservoir Tank

G2M0987
B: INSPECTION
If any damage, deformation, wear, swelling, rust or other
faults are found on the cylinder, piston, push rod, fluid
reservoir, seat and gasket, replace the faulty part.
B2M1261A
C: INSTALLATION
1) Install master cylinder to body.
Tightening torque:
18±3 N⋅m (1.8±0.3 kg-m, 13.0±2.2 ft-lb)
B2M1260A
2) Install clutch hose to master cylinder.
CAUTION:
Check that hose is routed properly.
Tightening torque:
18±3 N⋅m (1.8±0.3 kg-m, 13.0±2.2 ft-lb)
B4M1189B
3) Connect push rod
3of master cylinder to clutch pedal,
and install clevis pin

1and snap pin
2.
NOTE:
Apply grease to clevis pin.
4) After bleeding air from system, ensure that clutch oper-
ates properly.
<Ref. to 2-10 [W202].>
17
2-10SERVICE PROCEDURE
6. Master Cylinder and Reservoir Tank

G2M0970
7. Clutch Damper
A: REMOVAL AND INSTALLATION
1) Remove clutch hoses from clutch damper.
CAUTION:
Cover hose joint to prevent clutch fluid from flowing
out.
2) Remove clutch damper with bracket.
G2M0991
3) Installation is in the reverse order of removal.
Tightening torque:
T1: 18±3 N⋅m (1.8±0.3 kg-m, 13.0±2.2 ft-lb)
T2: 25±7 N⋅m (2.5±0.7 kg-m, 18.1±5.1 ft-lb)
4) After bleeding air from system, ensure that clutch oper-
ates properly.
<Ref. to 2-10 [W202].>
8. Clutch Fluid
A: REPLACEMENT
CAUTION:
The FMVSS No. 116, fresh DOT3 or 4 brake fluid
must be used.
Cover bleeder with waste cloth, when loosening it,
to prevent clutch fluid from being splashed over sur-
rounding parts.
Avoid mixing different brands of clutch fluid to pre-
vent degrading the quality of the fluid.
Be careful not to allow dirt or dust to get into the
reservoir tank.
NOTE:
During bleeding operation, keep the clutch reserve tank
filled with clutch fluid to eliminate entry of air.
Clutch pedal operating must be very slow.
For convenience and safety, it is advisable to have two
man working.
The amount of clutch fluid required is approximately 70
m
(2.4 US fl oz, 2.5 Imp fl oz) for total clutch system.
1) Either jack-up vehicle and place a safety stand under it,
or lift-up vehicle.
2) Remove both front and rear wheels.
3) Draw out the clutch fluid from reserve tank with syringe.
4) Refill reservoir tank with recommended clutch fluid.
Recommended clutch fluid:
FMVSS No. 116, fresh DOT3 or 4 brake fluid
5) Bleed air from oil line with the help of a co-worker.
<Ref. to 2-10 [W202].>
18
2-10SERVICE PROCEDURE
7. Clutch Damper - 8. Clutch Fluid