Subaru 2009 IMPREZA, Руководство по обслуживанию

Страница: 2448 / 3619

VDC-9
VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)
VEHICLE DYNAMICS CONTROL (VDC)
12) Bleed air from RL and RR caliper bodies, and
pressure gauge.
13) Perform VDC sequence control.
<Ref. to VDC-13, VDC Sequence Control.>
14) When the hydraulic unit begins to work, first the
RR side performs compression, hold, and decom-
pression, and then the RL side performs compres-
sion, hold, and decompression.
15) Read the values indicated on the pressure
gauges and check if it is within specification. De-
press the brake pedal and check that it is not abnor-
mally hard, and tightness is normal.
16) Disconnect the pressure gauge from the RL
and RR caliper bodies.
17) Install the air bleeder screws of RL and RR cal-
iper bodies.
18) Bleed air from the brake line.
4. CHECK HYDRAULIC UNIT VDC
OPERATION WITH BRAKE TESTER
1) Set wheels other than the one to measure on
free rollers.
2) Prepare to operate the VDC sequence control.
<Ref. to VDC-13, VDC Sequence Control.>
3) Set the front wheels or rear wheels on the brake
tester and set the select lever position to the “N”
range.
4) Operate the brake tester.
5) Perform VDC sequence control.
<Ref. to VDC-13, VDC Sequence Control.>
6) When the hydraulic unit begins to work, check
the following work sequence.
(1) The FL wheel performs compression, hold
and decompression in sequence, and subse-
quently the FR wheel repeats the cycle.
(2) The RR wheel performs compression, hold
and decompression in sequence, and subse-
quently the RL wheel repeats the cycle.
7) Read values indicated on the brake tester and
check if the fluctuation of the values between de-
compression and compression meets specifica-
tion.
8) 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 pressure sensor built into the H/
U is easily damaged by static electricity, start
the operation after performing static electricity
measures.
• Be careful not to touch the sensors in the H/U
to prevent damage.
• Because the seal of the VDCCM 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 VDCCM, always use new
screws.
• When the sealing surface of the VDCCM or H/
U is dirty or damaged and it cannot be cleaned
or repaired, replace with a new part.
1) Remove the VDCCM&H/U. <Ref. to VDC-7, RE-
MOVAL, VDC Control Module and Hydraulic Con-
trol Unit (VDCCM&H/U).>
2) To prevent entry of foreign objects and brake flu-
id leakage, plug the oil pressure port of the VDC-
CM&H/U using a screw plug, etc.
(1) Brake tester
ABS00136
(1)
ABS00137
(1)
Front wheel Rear wheel
When pressurized
2,000 N
(204 kgf, 450 lbf)
or more
2,000 N
(204 kgf, 450 lbf)
or more
When depressur-
ized
500 N
(51 kgf, 112 lbf)
or less
500 N
(51 kgf, 112 lbf)
or less