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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 >> Check Hydraulic Unit VDC Operation With Brake Tester

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 SEQUENCE CONTROL .>
  3. Set the front wheels or rear wheels on the brake tester (a) and set the gear to neutral.
    Fig 1: Checking Hydraulic Unit VDC Operation Using Brake Tester
    G10269887Courtesy of SUBARU OF AMERICA, INC.
  4. Operate the brake tester.
    NOTE: When any wheel speed reaches 10 km/h (6 MPH), the VDC sequence control stops and VDC operation is returned to the normal control mode.
  5. Perform VDC sequence control. <Ref. to VDC SEQUENCE CONTROL .>
  6. When the hydraulic unit begins to work, check the following work sequence.
    1. The front LH wheel performs compression, hold and decompression in sequence, and subsequently the front RH wheel repeats the same cycle.
    2. The rear RH wheel performs compression, hold and decompression in sequence, and subsequently the rear LH wheel repeats the same cycle.
  7. Read values indicated on the brake tester and check if the fluctuation of the values between decompression and compression meets specification.
    Inspection conditions 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 depressurized 500 N (51 kgf, 112 lbf) or less 500 N (51 kgf, 112 lbf) or less
  8. After the inspection, depress the brake pedal and check that it is not abnormally hard, and tightness is normal.
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