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Home >> Audi >> 2016 >> S5 Prestige, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 121 (Anti-Lock Brake System - Vehicle Dynamics Control (VDC)) >> VDC Control Module and Hydraulic Control Unit (VDC-CM & H/U) >> Inspection >> Checking The Hydraulic Unit VDC Operation With Brake Tester

Checking The Hydraulic Unit VDC Operation With 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 to operate the VDC sequence control. < Ref. to VDC 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
    G07681200Courtesy of SUBARU OF AMERICA, INC.
    Fig 2: Setting Rear Wheels On Brake Tester
    G07681201Courtesy of SUBARU OF AMERICA, INC.
  4. Operate the brake tester.
  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 FL wheel performs compression, hold and decompression in sequence, and subsequently the FR wheel repeats the cycle.
    2. The RR wheel performs compression, hold and decompression 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
    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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