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Home >> Subaru >> 2013 >> Outback Base, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 24 (Vehicle Dynamics Control (VDC) System) >> VDC Control Module and Hydraulic Control Unit (VDCCM& H/U) >> Inspection >> Checking The Hydraulic Unit VDC Operation Using A Pressure Gauge
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Checking The Hydraulic Unit VDC Operation Using A Pressure Gauge

WARNING: This page is about a different car, the 2013 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
  1. Lift up the vehicle, and then remove the wheel.
  2. Remove the air bleeder screws from FL and FR caliper bodies.
  3. Connect two pressure gauges to FL and FR caliper bodies.
    CAUTION:
    • Use a pressure gauge used exclusively for brake fluid measurement.
    • 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.
    Fig 1: Checking Hydraulic Unit ABS/VDC Operation Using Pressure Gauge
    G05003734Courtesy of SUBARU OF AMERICA, INC.
  4. Bleed air from the pressure gauge.
  5. Perform VDC sequence control.< Refer to 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.
      Front wheel Rear wheel
    When pressurized 3, 000 kPa (31 kgf/cm2 , 441 psi) or more 3, 000 kPa (31 kgf/cm2 , 441 psi) or more
    When depressurized 500 kPa (5 kgf/cm2 , 73 psi) or less 500 kPa (5 kgf/cm2 , 73 psi) or less
  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.
  13. Perform VDC sequence control.< Refer to VDC SEQUENCE CONTROL . >
  14. When the hydraulic unit begins to work, first the RR side performs compression, hold, and decompression, and then the RL side performs compression, hold, and decompression.
  15. Read the values indicated on the pressure gauges and check if it is within specification. Depress the brake pedal and check that it is not abnormally 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 caliper bodies.
  18. Bleed air from the brake system.< Refer to PROCEDURE , Air Bleeding. >
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