Subaru Impreza 2003, Service Manual

Page: 2324 / 3610

ABS-8
ABS
ABS CONTROL MODULE AND HYDRAULIC CONTROL UNIT (ABSCM&H/U)
C: INSPECTION
1) Check the connected and fixed condition of con-
nector.
2) Check specifications of the mark with
ABSCM&H/U.
1. CHECKING THE HYDRAULIC UNIT ABS
OPERATION BY PRESSURE GAUGE
1) Lift-up the vehicle and remove the wheels.
2) Disconnect 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 employ pressure gauge previously
used for transmission since the piston seal is
expanded which may lead to malfunction of the
brake.
NOTE:
Wrap sealing tape around the pressure gauge.
4) Bleed air from the pressure gauges.
5) Perform the ABS sequence control.
<Ref. to ABS-10, ABS Sequence Control.>
6) When the hydraulic unit begins to work, and first
the FL side performs decompression, holding, and
compression, and then the FR side performs de-
compression, holding, 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. Also check if any irregular brake pedal
tightness is felt.
8) Remove the pressure gauges from the FL and
FR caliper bodies.
9) Remove the air bleeder screws from the RL and
RR caliper bodies.
10) Connect the air bleeder screws to the FL and
FR caliper bodies.
11) Connect two pressure gauges to the RL and
RR caliper bodies.
12) Bleed air from the pressure gauges and the FL
and FR caliper bodies.
13) Perform the ABS sequence control.
<Ref. to ABS-10, ABS Sequence Control.>
14) When the hydraulic unit begins to work, at first
the RR side performs decompression, holding, and
compression, and then the RL side performs de-
compression, holding, and compression.
15) Read values indicated on the pressure gauges
and check if they meet the standard value.
16) After checking, remove the pressure gauges
from caliper bodies.
17) Connect the air bleeder screws to RL and RR
caliper bodies.
18) Bleed air from the brake line.
Mark Model
CK FWD AT model
CL FWD MT model
CU AWD AT model
CV
AWD MT model
(Except Sedan STi model)
CX Sedan STi model
(1) Mark
ABS00133
(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)
Decom-
pressed
500 kPa
(5 kgf/cm
2
, 73 psi)
or less
500 kPa
(5 kgf/cm
2
, 73 psi)
or less
Compressed
3,500 kPa
(36 kgf/cm
2
, 511 psi)
or more
3,500 kPa
(36 kgf/cm
2
, 511 psi)
or more