Subaru Legacy IV (2008 year). Manual — part 897

ABS-4

General Description

ABS

2. ABS CONTROL MODULE AND HYDRAULIC CONTROL UNIT (ABSCM&H/U)

(1)

ABS control module and hydraulic
control unit (ABSCM&H/U)

(6)

Primary inlet

(11)

Bracket

(7)

Secondary inlet

(2)

Front outlet RH

(8)

Damper

Tightening torque:N·m (kgf-m, ft-lb)

(3)

Rear outlet LH

(9)

Spacer

T1: 7.5 (0.76, 5.5)

(4)

Rear outlet RH

(10)

Damper

T2: 33 (3.3, 24)

(5)

Front outlet LH

(1)

(8)

(11)

(7)

(6)

(5)

(4)

(3)

(10)

(2)

T1

T2

T2

(9)

T2

ABS00938

ABS-5

General Description

ABS

C: CAUTION

• Wear appropriate work clothing, including a cap, protective goggles and protective shoes when performing
any work.
• Before disconnecting connectors of sensors or units, be sure to disconnect the ground cable from the bat-
tery.
• Before removal, installation or disassembly, be sure to clarify the failure. Avoid unnecessary removal, in-
stallation, disassembly and replacement.
• Vehicle components are extremely hot after driving. Be wary of receiving burns from heated parts.
• Be sure to tighten fasteners including bolts and nuts to the specified torque.
• Place shop jacks or rigid racks at the specified points.

D: PREPARATION TOOL

1. SPECIAL TOOL

2. GENERAL TOOL

ILLUSTRATION

TOOL NUMBER

DESCRIPTION

REMARKS

1B022XU0

SUBARU SELECT
MONITOR III KIT

Used for troubleshooting the electrical system.

TOOL NAME

REMARKS

Circuit tester

Used for measuring resistance, voltage and current.

Pressure gauge

Used for measuring oil pressure.

Oscilloscope

Used for measuring the sensor.

TORX

®

bit E5

Used for replacing the ABSCM.

ST1B022XU0

ABS-6

ABS Control Module and Hydraulic Control Unit (ABSCM&H/U)

ABS

2. ABS Control Module and

Hydraulic Control Unit
(ABSCM&H/U)

A: REMOVAL

1) Disconnect the ground cable from the battery.
2) Use compressed air to remove water and dust
around the ABSCM&H/U.

NOTE:
If the terminals become dirty, it may cause improp-
er contact.
3) Lift the lock lever and disconnect the AB-
SCM&H/U connector.

CAUTION:
Do not pull on the harness when disconnecting
the connector.

4) Remove the harness clip.
5) Disconnect the brake pipes from the ABSCM&H/U.
6) Wrap the brake pipe with a vinyl bag so as not to
spill the brake fluid on the vehicle body.

CAUTION:
If brake fluid is spilled on the vehicle body, wash
it off immediately with water and wipe clean.
7) Remove the nuts and remove the ABSCM&H/U.

CAUTION:
• Do not drop or bump the ABSCM&H/U.
• Do not turn the ABSCM&H/U upside down or
place it sideways for storage.
• Be careful not to let foreign matter enter into
ABSCM&H/U.
• Be careful that no water enters the connectors.

8) Remove the ABSCM&H/U bracket.

B: INSTALLATION

1) Install the ABSCM&H/U bracket.

Tightening torque:

33 N·m (3.3 kgf-m, 24 ft-lb)

2) Align the damper groove of the ABSCM&H/U to
the bracket side claw, and install the ABSCM&H/U
with new nuts (Part No. 023506000).

NOTE:
Check the identification marks of the ABSCM&H/U.

Tightening torque:

7.5 N·m (0.76 kgf-m, 5.5 ft-lb)

3) Connect the brake pipes to their correct AB-
SCM&H/U positions.

Tightening torque:

15 N·m (1.5 kgf-m, 10.8 ft-lb)

4) Using a harness clip, secure the ABSCM&H/U
harness to the bracket.
5) Connect the connector to the ABSCM&H/U.

NOTE:
• Be sure to remove all foreign matter from inside
the connector before connecting.
• Make sure the ABSCM&H/U connector is se-
curely locked.
6) Bleed air from the brake system.

ABS00382

ABS00383

ABS00383

ABS-7

ABS Control Module and Hydraulic Control Unit (ABSCM&H/U)

ABS

C: INSPECTION

1) Check the condition of connection and settle-
ment of connector.
2) Check the mark used for ABSCM&H/U identifi-
cation.
Refer to “SPECIFICATION” for the identification
mark. <Ref. to ABS-2, SPECIFICATION, General
Description.>

1. CHECKING THE HYDRAULIC UNIT ABS
OPERATION BY PRESSURE GAUGE

1) Lift up the vehicle, and remove the wheels.
2) Remove the air bleeder screws from FL and FR
caliper bodies.
3) Connect two pressure gauges to FL and FR cal-
iper bodies.

CAUTION:
• Use a pressure gauge used exclusively for
brake fluid measurement.
• Do not use the pressure gauge used for the
measurement of transmission oil. Doing so will
cause the piston seal to expand and deform.

NOTE:
Wrap sealing tape around the pressure gauge.

4) Bleed air from the pressure gauges and the FL
and FR caliper bodies.
5) Perform ABS sequence control.
<Ref. to ABS-10, ABS Sequence Control.>
6) When the hydraulic unit begins to work, first the
FL side performs decompression, hold and com-
pression, and then the FR side performs decom-
pression, hold and compression.

7) Read values indicated on the pressure gauge
and check if the fluctuation of the values between
decompression and compression meets the stan-
dard values. Depress the brake pedal and check
that the kick-back is normal, and tightness is nor-
mal.

8) Disconnect the pressure gauges from FL and FR
caliper bodies.
9) Install the air bleeder screws of FL and FR cali-
per bodies.
10) Remove the air bleeder screws from RL and
RR caliper bodies.
11) Connect two pressure gauges to RL and RR
caliper bodies.
12) Bleed air from the brake system.
13) Bleed air from RL and RR caliper bodies, and
pressure gauge.
14) Perform ABS sequence control.
<Ref. to ABS-10, ABS Sequence Control.>
15) When the hydraulic unit begins to work, first the
RR side performs decompression, hold and com-
pression, and then the RL side performs decom-
pression, hold and compression.
16) Read values indicated on the pressure gauge
and check if the fluctuation of the values between
decompression and compression meets specifica-
tion. Depress the brake pedal and check that the
kick-back is normal, and tightness is normal.
17) Disconnect the pressure gauge from the RL
and RR caliper bodies.
18) Install the air bleeder screws of RL and RR cal-
iper bodies.
19) Bleed air from the brake system.

(1) Identification mark

ABS00384

(1)

ABS00134

Front wheel

Rear wheel

Initial value

3,500 kPa

(36 kgf/cm

2

, 511 psi)

3,500 kPa

(36 kgf/cm

2

, 511 psi)

When
depressurized

500 kPa

(5 kgf/cm

2

, 73 psi)

or less

500 kPa

(5 kgf/cm

2

, 73 psi)

or less

When
pressurized

3,500 kPa

(36 kgf/cm

2

, 511 psi)

or more

3,500 kPa

(36 kgf/cm

2

, 511 psi)

or more