Subaru Impreza 2003 Service Manual page 2325

ABS CONTROL MODULE AND HYDRAULIC CONTROL UNIT (ABSCM&H/U)
2. CHECKING THE HYDRAULIC UNIT ABS
OPERATION WITH BRAKE TESTER
1) In the case of AWD AT models, install a spare
fuse with the FWD connector in the main fuse box
to simulate FWD models.
(1)
(1) Main fuse box
(2) FWD connector
NOTE:
AWD circuit of MT models can not be disabled be-
cause viscous coupling is used inside center differ-
ential.
2) Prepare for operating the ABS sequence control.
<Ref. to ABS-10, ABS Sequence Control.>
3) Set the front wheels or rear wheels on the brake
tester and set the select lever's position at "N"
range.
(1)
(1) Brake tester
4) Operate the brake tester.
(2)
ABS00135
ABS00136
(1)
ABS00137
ABS-9
5) Perform the ABS sequence control.
<Ref. to ABS-10, ABS Sequence Control.>
6) Hydraulic unit begins to work; and check the fol-
lowing working sequence.
(1) The FL wheel performs decompression,
holding, and compression in sequence, and
subsequently the FR wheel repeats the cycle.
(2) The RR wheel performs decompression,
holding, and compression in sequence, and
subsequently the RL wheel repeats the cycle.
7) Read values indicated on the brake tester and
check if the fluctuation of values, when decom-
pressed and compressed, meets the standard val-
ues.
Front wheel
Initial value
(102 kgf, 225 lb)
Decompressed (51 kgf, 112 lb)
Compressed (102 kgf, 225 lb)
8) After checking, also check if any irregular brake
pedal tightness is felt.
Rear wheel
1,000 N 1,000 N
(102 kgf, 225 lb)
500 N 500 N
(51 kgf, 112 lb)
or less or less
1,000 N 1,000 N
(102 kgf, 225 lb)
or more or more
ABS