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Home >> Subaru >> 2013 >> Legacy Premium, Automatic CVT Trans >> Repair and Diagnosis >> Brakes >> Traction Control >> Vehicle Dynamics Control (VDC) System >> VDC Control Module and Hydraulic Control Unit (VDCCM&H/U) >> Inspection >> Checking The Hydraulic Unit Abs Operation By Pressure Gauge

Checking The Hydraulic Unit Abs Operation By Pressure Gauge

  1. Lift up the vehicle, and then remove the wheel.
  2. Remove the air bleeder screws from FL and FR caliper bodies.
  3. Connect two pressure gauges to FL and FR caliper bodies.
    CAUTION:
    • Use a pressure gauge used exclusively for brake fluid measurement.
    • Do not use the pressure gauge used for the measurement of transmission oil. Doing so will cause the piston seal to expand and deform.
    NOTE: Wrap sealing tape around the pressure gauge.
    Fig 1: Connecting Pressure Gauges To Caliper Bodies
    G05003734Courtesy of SUBARU OF AMERICA, INC.
  4. Bleed air from the pressure gauges and the FL and FR caliper bodies.
  5. Perform ABS sequence control. < Refer to ABS SEQUENCE CONTROL . >
  6. When the hydraulic unit begins to work, first the FL side performs decompression, hold and compression, and then the FR side performs decompression, hold and compression.
  7. Read values indicated on the pressure gauge and check if the fluctuation of the values between decompression and compression meets the standard values. Depress the brake pedal and check that the kick-back is normal, and tightness is normal.
    Inspection conditions Front wheel Rear wheel
    Initial value 3, 500 kPa (36 kgf/cm2 , 511 psi) 3, 500 kPa (36 kgf/cm2 , 511 psi)
    When depressurized 500 kPa (5 kgf/cm2 , 73 psi) or less 500 kPa (5 kgf/cm2 , 73 psi) or less
    When pressurized 3, 500 kPa (36 kgf/cm2 , 511 psi) or more 3, 500 kPa (36 kgf/cm2 , 511 psi) or more
  8. Disconnect the pressure gauges from FL and FR caliper bodies.
  9. Install the air bleeder screws of FL and FR caliper bodies.
  10. Remove the air bleeder screws from RL and RR caliper bodies.
  11. Connect two pressure gauges to RL and RR caliper bodies.
  12. Bleed air from RL and RR caliper bodies, and pressure gauge.
  13. Perform ABS sequence control. < Refer to ABS SEQUENCE CONTROL . >
  14. When the hydraulic unit begins to work, first the RR side performs decompression, hold and compression, and then the RL side performs decompression, hold and compression.
  15. Read values indicated on the pressure gauge and check if the fluctuation of the values between decompression and compression meets specification. Depress the brake pedal and check that the kick-back is normal, and tightness is normal.
  16. Disconnect the pressure gauge from the RL and RR caliper bodies.
  17. Install the air bleeder screws of RL and RR caliper bodies.
  18. Bleed air from the brake system. < Refer to AIR BLEEDING . >
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