Subaru 2009 IMPREZA Service Manual page 2371

ABS Control Module and Hydraulic Control Unit (ABSCM&H/U)
ABS
2. CHECKING THE HYDRAULIC UNIT ABS
OPERATION WITH THE BRAKE TESTER
1) For AT model, install the spare fuse to the FWD
connector located in the fuse & relay box.
(1) Fuse & Relay Box
(2) FWD connector (No. 15)
2) Since the MT model cannot cut off the AWD cir-
cuit, set the wheels other than the measured one
on free rollers.
3) Prepare for 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 gear to "neutral".
(1)
(1) Brake tester
5) Operate the brake tester.
6) Perform ABS sequence control.
<Ref. to ABS-10, ABS Sequence Control.>
(1)
(2)
ABS01033
ABS00136
(1)
ABS00137
ABS-8
7) When the hydraulic unit begins to work, check
the following work sequence.
(1) The FL wheel performs decompression,
hold and compression in sequence, and subse-
quently the FR wheel repeats the cycle.
(2) The RR wheel performs decompression,
hold and compression in sequence, and subse-
quently 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 specifica-
tion.
Front wheel
1,000 N
Initial value
(102 kgf, 225 lbf)
500 N
When
(51 kgf, 112 lbf)
depressurized
or less
1,000 N
When pressurized (102 kgf, 225 lbf)
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 the ABSCM cannot be re-
placed, do not pull or peel it by lifting it up.
• Because the screw of the H/U will become
slightly worn in every replacement procedure, 5
times is the maximum number of times for re-
placement. If a problem is found such as not
being able to torque the screw to specifications
even before 5 replacement operations are per-
formed, replace the H/U body.
• When installing the ABSCM, always use new
screws.
• When the sealing surface of the ABSCM or H/
U is dirty or damaged and it cannot be removed
or repaired, replace with a new part.
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 entry of foreign objects and brake flu-
id leakage, plug the oil pressure port of the AB-
SCM&H/U using a screw plug, etc.
Rear wheel
1,000 N
(102 kgf, 225 lbf)
500 N
(51 kgf, 112 lbf)
or less
1,000 N
(102 kgf, 225 lbf)
or more