Subaru Legacy 2004 Service Manual page 2954

ABS Control Module and Hydraulic Control Unit (ABSCM&H/U)
ABS
2. CHECKING THE HYDRAULIC UNIT ABS
OPERATION WITH BRAKE TESTER
1) Install the spare fuse to the FWD connector lo-
cated in the main fuse box for the model without AT
VTD.
(1) Main fuse box
(2) FWD connector
2) Since the MT model and AT VTD model cannot
cut off the AWD circuit forcibly, set the wheels other
than measured one onto free rollers.
3) Prepare for the ABS sequence control.
<Ref. to ABS-10, ABS Sequence Control.>
4) Set the front wheels or rear wheels on the brake
tester and set the select lever to "neutral".
(1)
(1) Brake tester
5) Operate the brake tester.
6) Perform ABS sequence control.
<Ref. to ABS-10, ABS Sequence Control.>
7) When the hydraulic unit begins to work, check
the following working sequence.
(1)
(2)
ABS00392
ABS00136
(1)
ABS00137
ABS-8
(1) The FL wheel performs decompression,
holding and compression in sequence, and sub-
sequently the FR wheel repeats the cycle.
(2) The RR wheel performs decompression,
holding and compression in sequence, and sub-
sequently the RL wheel repeats the cycle.
8) Read values indicated on the brake tester and
check if the fluctuation of the values between de-
compression and compression meets the standard
values.
Front wheel
1,000 N
Initial value
(102 kgf, 225 lb)
When 500 N
decom- (51 kgf, 112 lb)
pressed or less
1,000 N
When com-
(102 kgf, 225 lb)
pressed
or more
9) After the inspection, depress the brake pedal
and check that it is not abnormally hard, and tight-
ness is normal.
D: REPLACEMENT
CAUTION:
• Because the seal of ABSCM cannot be re-
placed, do not pull or peel it with lifting up.
• Because the screw part of H/U deteriorates in
every replacement procedure, do not perform
the replacement more than five times on it.
When the malfunction is found though the re-
placement that performed is less than five
times, replace the H/U body.
• Use new screws for installation of ABSCM.
• When the sealing surface of ABSCM or H/U is
dirty or damaged and it cannot be removed or
repaired, replace it with new one.
1) Remove the ABSCM&H/U. <Ref. to ABS-6, RE-
MOVAL, ABS Control Module and Hydraulic Con-
trol Unit (ABSCM&H/U).>
2) To prevent entering foreign matter and brake flu-
id leakage, plug the oil pressure port of ABSCM&H/
U using screw plug and etc.
3) Set the pump motor part of removed ABSCM&H/
U faces down on a vise.
Rear wheel
1,000 N
(102 kgf, 225 lb)
500 N
(51 kgf, 112 lb)
or less
1,000 N
(102 kgf, 225 lb)
or more