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Home >> Audi >> 2010 >> S4 Automatic DCT >> Repair and Diagnosis >> External Pages >> Different car >> Section 204 (Anti-Lock Brake System - Vehicle Dynamics Control (VDC)) >> VDC Control Module and Hydraulic Control Unit (VDC-CM & H/U) >> Inspection >> Checking The Hydraulic Unit Abs Operation By Brake Tester

Checking The Hydraulic Unit Abs Operation By Brake Tester

WARNING: This page is about a different car, the 2012 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
  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 and set the gear to neutral.
    Fig 1: Setting Front Wheels On Brake Tester
    G07681197Courtesy of SUBARU OF AMERICA, INC.
    Fig 2: Setting Rear Wheels On Brake Tester
    G07681198Courtesy of SUBARU OF AMERICA, INC.
  4. Operate the brake tester.
  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 FL wheel performs decompression, hold and compression in sequence, and subsequently the FR wheel repeats the cycle.
    2. The RR wheel performs decompression, hold 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 the values between decompression and compression meets specification.
    WHEEL SPECIFICATION CHART

      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 1b) 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.