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Home >> Subaru >> 2002 >> Forester Base >> Repair and Diagnosis >> Brakes >> Traction Control >> Abs >> ABS Control Module and Hydraulic Control Unit (ABSCM & H/U) >> Inspection >> Checking The Hydraulic Unit Abs Operation By Pressure Gauge

Checking The Hydraulic Unit Abs Operation By Pressure Gauge

  1. Lift-up vehicle and remove wheels.
  2. Disconnect the air bleeder screws from the FL and FR caliper bodies.
  3. Connect two pressure gauges to the FL and FR caliper bodies.
    CAUTION:
    • Pressure gauges used exclusively for brake fluid must be used.
    • Do not employ pressure gauge previously used for transmission since the piston seal is expanded which may lead to malfunction of the brake.
    NOTE: Wrap sealing tape around the pressure gauge.
    Fig 1: Connecting Pressure Gauges To FL And FR Caliper Bodies
    G03452935Courtesy of SUBARU OF AMERICA, INC.
  4. Bleed air from the pressure gauges.
  5. Perform ABS sequence control.

    < Ref. to , ABS SEQUENCE CONTROLS  .>

  6. When the hydraulic unit begins to work, and first the FL side performs decompression, holding, and compression, and then the FR side performs decompression, holding, 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. Also check if any irregular brake pedal tightness is felt.
    WHEEL SPECIFICATIONS

    Front wheel Rear wheel
    Initial value 3,432 kPa (35 kg/cm2 , 498 psi) 3,432 kPa (35 kg/cm2 , 498 psi)
    When decompressed 490 kPa (5 kg/cm2 , 71 psi) or less 490 kPa (5 kg/cm2 , 71 psi) or less
    When compressed 3,432 kPa (35 kg/cm2 , 498 psi) or less 3,432 kPa (35 kg/cm2 , 498 psi) or less
  8. Remove pressure gauges from FL and FR caliper bodies.
  9. Remove air bleeder screws from the RL and RR caliper bodies.
  10. Connect the air bleeder screws to the FL and FR caliper bodies.
  11. Connect two pressure gauges to the RL and RR caliper bodies.
  12. Bleed air from the pressure gauges and the FL and FR caliper bodies.
  13. Perform ABS sequence control.

    < Ref. to , ABS SEQUENCE CONTROLS  . >

  14. When the hydraulic unit begins to work, at first the RR side performs decompression, holding, and compression, and then the RL side performs decompression, holding, and compression.
  15. Read values indicated on the pressure gauges and check if they meet the standard value.
  16. After checking, remove the pressure gauges from caliper bodies.
  17. Connect the air bleeder screws to RL and RR caliper bodies.
  18. Bleed air from brake line.
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