1997 SUBARU LEGACY ABS

4-4
IM13-5]
BRAKES
13
.
Anti-lock
Brake
System
(ABS)
[5
.3i
Type]

3)
Pressure
"hold"
action
with
ABS
in
operation
(Explained
with
one
wheel's
control
asan

example)

Current
is
supplied
to
the
inlet
solenoid
valve,
and
the
generated
solenoid
valve
attracting
force

closes
the
inlet
port
.

Sinceno
current
is
supplied
to
the
outlet
solenoid
valve,
the
output
port
remains
in
a
closed
state
.

As
a
result,
the
wheel
cylinder,
master
cylinder
and
reservoir
are
blocked,
and
the
fluid
pressure

of
the
wheel
cylinder
is
maintained
constant
.

During
ABS
operation,the
pump
motor
continues
to
operate
.

From
master
cylinder
N~

O

Reservoir

B4H0991

10

BRAKES
[M13-5]
4-4
13
.
Anti-lock
Brake
System
(ABS)
[5
.3i
Type]

4)
Pressure
"increase"
action
with
ABS
in
operation(Explained
with
one
wheel's
control
as
anexample)

Since
no
current
is
supplied
to
the
inlet
and
outlet
solenoid
valves,
no
solenoidvalve
attracting

force
is
generated
.
So
the
valves
remain
stationary
.

Accordingly,
the
inlet
port
of
the
inlet
solenoid
valve
isin
an
opened
state,
whereas
the
outlet
port

of
the
outlet
solenoid
valve
is
in
a
closed
state
.
So
the
fluid
pressure
of
the
master
cylinder
is
trans-

mitted
to
the
wheel
cylinder
to
increase
the
brake
force
in
the
wheel
cylinder
.

During
ABS
operation,
the
pump
motor
continues
to
operate
.

From
master
cylinder
\
V

Reservoir

B4H0992

11

4-4
[M13-6l
BRAKES
13
.
Anti-lock
Brake
System
(
AB
S)
[5.3
i
Type]

6
.
ABS
CONTROL
CYCLE
CURVES

Refer
to
4-4
[M8-6]
-*1

7
.
ABS
WARNING
LIGHT

Refer
to
4-4
[M8-7]
-*1

S
.
G
SENSOR

Refer
to
4-4
[M12-8]
.*5

12

4-4
[ciooi1
COMPONENT
PARTS

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

10
.
ABS
System
(ABS
5
.31
Type)

1
.
SENSOR

3

so

2

T2T2
T2

T1
~
T2T2
`>

I
43
~
t

T2

T2

o

Kow

6

T
.l
o

T2

o

T2

3

B4M
1219A

D
G
sensor
(AWD
only)

~2
Rear
ABS
sensor
RH

~3
ABS
spacer

~4
Rear
ABS
sensor
LH

~5
Front
ABS
sensor
LH

~6
Front
ABS
sensor
RH

Tightening
torque
:
N~m
(kg-m,
ft-1b)
TI
:
7
.4
12
.0
boas
f
0
.2,
5
.4
f
1
.4)
T2
:
32
±
10
(3
.3
f
1
.0,
24
±
7)

2

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"
.

COMPONENT
PARTS
[c1oo21
4-4
10
.
ABS
System
(ABS
5
.3i
Type)

2
.
ABS
CONTROLMODULE
AND
HYDRAULIC

CONTROL
UNIT
(ABSCM&H/U)

0
0

T1
0
~

lJ`
T2

r~

T3

a
.i

B4M
1220A
',

1~
Stud
bolt
~6
Front-RH
outlet

~2
Damper
07
Primary
inlet

%
ABS
control
module
and
hydraulic(k
Rear-LH
outlet

control
unit
~9
Rear-RH
outlet

~4
Front-1-11
outlet
~o
Bracket

~5
Secondary
inlet

Tightening
torque
:
N~m
(kg-m,
ft-1b)
T1
:
18f5
(1
.8f0
.5,
13
.0
13
.6)
T2
:
29
f
7
(3
.0
f
0,7,
21
.7
f
5
.1)
T3
:
32
f
10(3
.3
f
1
.0,
24
f
7)

3

SERVICE
PROCEDURE
[W18A5]
4-4
18
.
Brake
Hose
and
Pipe
5
.
MODELS
WITH
ABS
(ABS
5
.3i
TYPE)

B4M1221A

Union
bolt
~2
Front
brake
hose
RH

~3
Clip

~4
Valve
bracket

~5
Proportioning
valve

06
Front
brake
pipe
ASSY

~7
Front
brake
hose
LH

(V
Two-way
connector

Connector
bracket

~o
Rear
brake
hose
RH

Rear
brake
pipe
ASSY

~z
Rear
brake
hose
LH

Center
brake
pipe
ASSY

'
41

Tightening
torque
:
N~m
(kg-m,
ft-115)
TI
:
13f3
(1
.3f0
.3,
9
.4f2
.2)
T2
:
15±z(1
.5-0z,
10
.8±a)
T3
:
18f3
(1
.8f0
.3,
13
.0±
2
.2)
T4
:
18±
5
(1
.8
f
0
.5,
13
.0
f3
.6)

5

4-4
[w2soo1
SERVICE
PROCEDURE

25
.
ABS
Control
Module
and
Hydraulic
Control
Unit
(ABSCM&H/U)
[ABS
5
.3i
Type]

25
.
ABS
Control
Module
and
Hydraulic

Control
Unit
(ABSCM&H/U)
[ABS
5
.31

Type]

2
~D

/
T1

2
1
r~

\Y'

0

T1
Q

T2

I
III

B4M1220A
I

Stud
boltO6
Front-RH
outlet

~2
Damper
~7
Primary
inlet

~3
ABS
control
module
and
hydraulic
~8
Rear-LH
outlet

control
unit~9
Rear-RH
outlet
~4
Front-LH
outlet
~o
Bracket

~5
Secondary
inlet

,,t-

Tightening
torque
:
N~m
(kg-m,
It-Ib)
TI
:
18
f
5
(1
.8
f
0
.5,
13
.0
f3
.6)
T2
:
29f7
(3
.0f0
.7,
21,7f5
.1)
T3
:
32
±
10
(3.3
f
1
.0,
24
f
7)

6