Subaru Legacy 2002 Service Manual page 2118

C: INSPECTION
1) Check connected and fixed condition of connector.
2) Check valve relay and motor relay for discontinuity or short circuits.
Condition
Turning off electricity.
Valve relay
Turning on electricity
between 85 and 86. (DC
12 V)
Turning off electricity.
Motor relay
Turning on electricity
between 85 and 86. (DC
12 V)
1. CHECKING THE HYDRAULIC UNIT ABS
OPERATION BY PRESSURE GAUGE
S402551A1001
1) Lift-up vehicle and remove 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:
¼ Pressure gauges used exclusively for brake
fluid must be used.
¼ 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 ABS sequence control.
<Ref. to VDC-16, ABS Sequence Control.>
HYDRAULIC CONTROL UNIT (H/U)
S402551A10
Terminal number
85 — 86
30 — 87a
30 — 87
30 — 87a
30 — 87
85 — 86
30 — 87
30 — 87
B4M1732
Standard
103±10 Ω
Less than 0.5 Ω
More than 1 MΩ
More than 1 MΩ
Less than 0.5 Ω
80±10 Ω
More than 1 MΩ
Less than 0.5 Ω
6) When the hydraulic unit begins to work, and
first the FL side performs decompression, holding,
and compression, and then the FR side performs
decompression, 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.
Initial value
When
decompressed
When
compressed
8) Remove pressure gauges from FL and FR cali-
per bodies.
9) Remove 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 ABS sequence control.
<Ref. to VDC-16, 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
VDC-13
Diagram Terminal location
G4M0456
G4M0458
Front wheel Rear wheel
3,432 kPa 3,432 kPa
2
(35 kg/cm , 498 psi) (35 kg/cm
490 kPa
2
(5 kg/cm , 71 psi) (5 kg/cm
or less
3,432 kPa 3,432 kPa
2
(35 kg/cm , 498 psi) (35 kg/cm
or more
VDC
G4M0457
G4M0459
2
, 498 psi)
490 kPa
2
, 71 psi)
or less
2
, 498 psi)
or more