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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 Abs Operation With The Brake Tester

Checking The Hydraulic Unit Abs Operation With The Brake Tester

  1. Set wheels other than the one to measure on free rollers.
  2. Prepare for the ABS sequence control operation. <Ref. to ABS 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 ABS 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 ABS sequence control stops and ABS operation is returned to the normal control mode.
  5. Perform ABS sequence control. <Ref. to ABS SEQUENCE CONTROL .>
  6. When the hydraulic unit begins to work, check the following work sequence.
    1. The front LH wheel performs decompression, hold and compression in sequence, and subsequently the front RH wheel repeats the same cycle.
    2. The rear RH wheel performs decompression, hold and compression 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
    Initial value 1, 000 N (102 kgf, 225 lb) 1, 000 N (102 kgf, 225 lb)
    When depressurized 500 N (51 kgf, 112 lb) or less 500 N (51 kgf, 112 lb) or less
    When pressurized 1, 000 N (102 kgf, 225 lb) or more 1, 000 N (102 kgf, 225 lb) or more
  8. After the inspection, depress the brake pedal and check that it is not abnormally hard, and tightness is normal.
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