Subaru Legacy 2004 Service Manual page 2953

ABS Control Module and Hydraulic Control Unit (ABSCM&H/U)
Refer to "SPECIFICATION" for mark. <Ref. to
ABS-2, SPECIFICATION, General Description.>
(1)
(1) Mark
1. CHECKING THE HYDRAULIC UNIT ABS
OPERATION BY PRESSURE GAUGE
1) Lift-up the vehicle, and then 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 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 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, 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. Depress the brake pedal and check
that the kick-back is normal, and tightness is nor-
mal.
Initial value
When
decom-
pressed
ABS00384
When com-
pressed
8) Remove the pressure gauges from the FL and
FR caliper bodies.
9) Connect the air bleeder screws of the FL and FR
caliper 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 brake system.
13) Bleed air from the pressure gauges and the RL
and RR caliper bodies.
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, holding and
compression, and then the RL side performs de-
compression, holding and compression.
16) 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.
17) Remove the pressure gauge from the RL and
RR caliper bodies.
18) Connect the air bleeder screws of the RL and
RR caliper bodies.
ABS00134
19) Bleed air from the brake system.
ABS-7
Front wheel
3,500 kPa
2
(36 kgf/cm , 511 psi) (36 kgf/cm
500 kPa
2
(5 kgf/cm , 73 psi) (5 kgf/cm
or less
3,500 kPa
2
(36 kgf/cm , 511 psi) (36 kgf/cm
or more
ABS
Rear wheel
3,500 kPa
2
, 511 psi)
500 kPa
2
, 73 psi)
or less
3,500 kPa
2
, 511 psi)
or more