Subaru LEGACY 2004 Service Manual page 307

VDC Control Module & Hydraulic Control Unit (VDCCM&H/U)
VEHICLE DYNAMICS CONTROL (VDC)
4) Connect the brake pipes to their specified VDC-
CM&H/U positions.
Tightening torque:
⋅
15 N m (1.5 kgf-m, 11.1 ft-lb)
5) Connect the connector to VDCCM&H/U.
NOTE:
• Be sure to remove all foreign matters from inside
the connector before connecting.
• Ensure that the VDCCM&H/U connector is se-
curely locked.
6) Connect the pressure sensor connector.
7) Bleed air from the brake system.
C: INSPECTION
1) Check the connected and fixed condition of con-
nector.
2) Check the mark used for VDCCM&H/U identifi-
cation.
Refer to "SPECIFICATION" for mark. <Ref. to
VDC-2, SPECIFICATION, General Description.>
(1)
(1) Mark
1. CHECKING THE HYDRAULIC UNIT ABS
OPERATION BY PRESSURE GAUGE
<Ref. to ABS-7, CHECKING THE HYDRAULIC
UNIT ABS OPERATION BY PRESSURE GAUGE,
INSPECTION, ABS Control Module and Hydraulic
Control Unit (ABSCM&H/U).>
2. CHECKING THE HYDRAULIC UNIT ABS
OPERATION WITH BRAKE TESTER
<Ref. to ABS-8, CHECKING THE HYDRAULIC
UNIT ABS OPERATION WITH BRAKE TESTER,
INSPECTION, ABS Control Module and Hydraulic
Control Unit (ABSCM&H/U).>
3. CHECKING THE HYDRAULIC UNIT VDC
OPERATION BY PRESSURE GAUGE
1) Lift-up the vehicle, and then remove the wheels.
2) Remove the air bleeder screws from the FL and
FR caliper bodies.
3) Connect two pressure gauges to the FL and FR
caliper bodies.
CAUTION:
• Pressure gauges used exclusively for brake
fluid must be used.
• Do not use the pressure gauge for the mea-
surement of transmission oil pressure since
the piston seal may be expanded and de-
formed.
NOTE:
Wrap a sealing tape around the pressure gauge.
4) Bleed air from the pressure gauges.
5) Perform VDC sequence control.
<Ref. to VDC-11, VDC Sequence Control.>
6) When the hydraulic unit begins to work, first the
FL side performs compression, holding, and de-
compression, and then the FR side performs com-
pression, holding, and decompression.
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
VDC00202
that it is not abnormally hard, and tightness is nor-
mal.
When com-
pressed
When decom-
pressed
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 the RL
and RR caliper bodies.
11) Connect two pressure gauges to the RL and
RR caliper bodies.
12) Bleed air from the pressure gauges and the RL
and RR caliper bodies.
13) Perform VDC sequence control.
<Ref. to VDC-11, VDC Sequence Control.>
VDC-8
Front wheel Rear wheel
3,000 kPa 2,000 kPa
2
(31 kgf/cm , 441 (20 kgf/cm
psi)
or more
500 kPa
2
(5 kgf/cm , 73 psi) (5 kgf/cm
or less
ABS00134
2
, 284
psi)
or more
500 kPa
2
, 73 psi)
or less