Subaru 2009 IMPREZA Service Manual page 2370

ABS Control Module and Hydraulic Control Unit (ABSCM&H/U)
5) Connect the connector to 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.
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)
(1) Identification mark
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.
Initial value
When
depressurized
When
pressurized
8) Disconnect the pressure gauges from FL and FR
ABS00384
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.
ABS00134
ABS-7
Front wheel Rear wheel
3,500 kPa 3,500 kPa
2
(36 kgf/cm , (36 kgf/cm
511 psi) 511 psi)
500 kPa 500 kPa
2
(5 kgf/cm , 73 psi) (5 kgf/cm
or less
3,500 kPa 3,500 kPa
2
(36 kgf/cm , (36 kgf/cm
511 psi) 511 psi)
or more or more
ABS
2
,
2
, 73 psi)
or less
2
,