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Home >> Subaru >> 2017 >> WRX Base >> Repair and Diagnosis (Single Page) >> Brakes >> Traction Control >> Vehicle Dynamics Control (VDC) System (Service Information) >> VDC Control Module and Hydraulic Control Unit (VDC Control Module & H/U) >> Inspection >> Checking The Hydraulic Unit VDC Operation Using A Pressure Gauge

Checking The Hydraulic Unit VDC Operation Using A Pressure Gauge

  1. Lift up the vehicle, and then remove the wheel.
  2. Remove the bleeder - screws from the front LH and front RH caliper bodies.
  3. Connect two pressure gauges to front LH and front RH 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 VDC Operation Using Pressure Gauge
    G08314724Courtesy of SUBARU OF AMERICA, INC.
  4. Bleed air from the pressure gauge.
  5. Perform VDC sequence control. <Ref. to VDC SEQUENCE CONTROL .>
    NOTE: When the hydraulic unit begins to work, first the front LH side performs compression, hold and decompression, and then the front RH side performs compression, hold and decompression.
  6. 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.
    Inspection conditions 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
  7. Remove the pressure gauge from the front LH and front RH caliper bodies.
  8. Install the bleeder - screws of the front LH and front RH caliper bodies.
  9. Remove the bleeder - screws from the rear LH and rear RH caliper bodies.
  10. Connect two pressure gauges to rear LH and rear RH caliper bodies.
  11. Bleed air from the pressure gauges and the rear LH and rear RH caliper bodies.
  12. Perform VDC sequence control. <Ref. to VDC SEQUENCE CONTROL .>
    NOTE: When the hydraulic unit begins to work, first the rear RH side performs compression, hold and decompression, and then the rear LH side performs compression, hold and decompression.
  13. 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.
  14. Remove the pressure gauge from the rear LH and rear RH caliper bodies.
  15. Install the bleeder - screws of the rear LH and rear RH caliper bodies.
  16. Bleed air from the brake system. <Ref. to Air Bleeding .>
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