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Home >> Subaru >> 2002 >> Outback Base, 4D Sedan >> Repair and Diagnosis >> Brakes >> Traction Control >> Abs >> ABS Control Module and Hydraulic Control Unit (ABSCM&H/U) >> Inspection >> Checking The Hydraulic Unit Abs Operation With Brake Tester

Checking The Hydraulic Unit Abs Operation With Brake Tester

  1. In the case of AWD AT vehicles, install a spare fuse with the FWD connector in the main fuse box to simulate FWD vehicles.
    Fig 1: Checking Hydraulic Unit ABS Operation With Brake Tester
    G02961080Courtesy of SUBARU OF AMERICA, INC.
  2. Prepare for operating ABS sequence control. Refer to ABS SEQUENCE CONTROLS 
  3. Set the front wheels or rear wheels on the brake tester and set the select lever's position at "neutral".
    Fig 2: Testing Front Wheels Brake
    G02961081Courtesy of SUBARU OF AMERICA, INC.
    Fig 3: Testing Rear Wheels Brake
    G02961082Courtesy of SUBARU OF AMERICA, INC.
  4. Operate the brake tester.
  5. Perform ABS sequence control.

    Refer to ABS SEQUENCE CONTROLS .

  6. Hydraulic unit begins to work; and check the following working sequence.
    1. The FL wheel performs decompression, holding, and compression in sequence, and subsequently the FR wheel repeats the cycle.
    2. The RR wheel performs decompression, holding, and compression in sequence, and subsequently the RL wheel repeats the cycle.
  7. Read values indicated on the brake tester and check if the fluctuation of values, when decompressed and compressed, meet the standard values.
    WHEEL PRESSURE SPECIFICATION CHART

    Front wheel Rear wheel
    Initial value 981 N (100 kgf, 221 lb) 981 N (100 kgf, 221 lb)
    When decompressed 490 N (50 kgf, 110 lb) or less 490 N (50 kgf, 110 lb) or less
    When compressed 981 N (100 kgf, 221 lb) or more 981 N (100 kgf, 221 lb) or more
  8. After checking, also check if any irregular brake pedal tightness is felt.
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