Impreza GT F4-2.5L Turbo (2009)
Electronic Brake Control Module: Testing and Inspection
With VDC
VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)
INSPECTION
1) Check the condition of connection and settlement of connector.
2) Check the mark used for VDCCM&H/U identification.
CHECKING THE HYDRAULIC UNIT VDC OPERATION USING A PRESSURE GAUGE
1) Lift up the vehicle, and remove the wheels.
2) Remove the air bleeder screws from FL and FR caliper bodies.
3) Connect two pressure gauges to FL and FR caliper bodies.
CAUTION:
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Use a pressure gauge used exclusively for brake fluid measurement.
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Do not use a pressure gauge used for the measuring transmission oil pressure, as the piston seal may expand and deform.
NOTE:
Wrap sealing tape around the pressure gauge.
4) Bleed air from the pressure gauge.
5) Perform VDC sequence control.
6) When the hydraulic unit begins to work, first the FL side performs compression, hold, and decompression, and then the FR side performs
compression, hold, and decompression.
7) Read values indicated on the pressure gauge and check if the fluctuation of the values between decompression and compression meets
specification. Depress the brake pedal and check that it is not abnormally hard, and tightness is normal.
8) Disconnect the pressure gauges from FL and FR caliper bodies.
9) Install the air bleeder screws of FL and FR caliper bodies.
10) Remove the air bleeder screws from RL and RR caliper bodies.
11) Connect two pressure gauges to RL and RR caliper bodies.
12) Bleed air from RL and RR caliper bodies, and pressure gauge.
