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Home >> Kia >> 2015 >> Optima Hybrid >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Active Hydraulic Boost (AHB) System - Optima HEV >> Pressure Source Unit >> Repair Procedures >> Removal

Repair Procedures: Removal

  1. Turn ignition switch OFF and disconnect the negative (-) battery cable.
  2. Remove the air duct (A).
    Fig 1: Air Duct
    G08312309Courtesy of KIA MOTORS AMERICA, INC.
  3. Remove air cleaner assembly (B).
    Fig 2: Air Cleaner Assembly
    G00548730Courtesy of KIA MOTORS AMERICA, INC.
  4. Disconnect the brake fluid level switch connector (A), and remove the reservoir cap.
    Fig 3: Brake Fluid Level Switch Connector
    G00548731Courtesy of KIA MOTORS AMERICA, INC.
    NOTE: Be sure to completely remove foreign substances from around brake fluid reservoir and cap before opening the reservoir cap. If not, it may cause contamination of brake fluid and deterioration in braking performance.
  5. Remove the brake fluid from the reservoir with a syringe.
    NOTE:
    • Do not spill brake fluid on the vehicle, it may damage the paint; if brake fluid does contact the paint, wash it off immediately with water.
    • To prevent any dust entering in the reservoir, the reservoir cap should be closed again after removing brake fluid.
    CAUTION: The following information describes how to diagnose faults using a diagnostic instrument.
    1. Connect the diagnostic instrument to the self-diagnostic connector (16-pin) beneath the crash pad on the side of driver"s seat, and then turn on the ignition to activate the diagnostic instrument
    2. In the GDS Vehicle Type Selection menu, select "Vehicle Type" and "Brake/VDC/AHB" System.
      Fig 4: High Pressure Release Mode Selection
      G00569775Courtesy of KIA MOTORS AMERICA, INC.
      Fig 5: High Pressure Release Mode Procedure 1
      G00569776Courtesy of KIA MOTORS AMERICA, INC.
      Fig 6: High Pressure Release Mode Procedure 2
      G00569777Courtesy of KIA MOTORS AMERICA, INC.
      Fig 7: High Pressure Release Mode Procedure 3
      G00569778Courtesy of KIA MOTORS AMERICA, INC.
    3. Disconnect the negative (-) battery terminal.
  6. Remove the IBAU (Refer to Brake Actuation Unit  )
  7. Disconnect the connector (A) and after removing a mounting clip, disconnect the reservoir hose (B).
    Fig 8: Reservoir Hose & Connector
    G00548736Courtesy of KIA MOTORS AMERICA, INC.
  8. Disconnect the brake tube from the PSU by loosening the bolt (B).
    CAUTION: Before removing the PSU, high pressure in an accumulator of PSU should be reduced for safety by conducting "High pressure release mode" of GDS connected to TF HEV.

    Tightening torque: 

    13.7 ~ 16.7 N.m (1.4 ~ 1.7 kgf.m, 10.1 ~ 12.3 lb-ft)

    Fig 9: Brake Tube Bolt
    G00548737Courtesy of KIA MOTORS AMERICA, INC.
  9. After disconnecting a connector, Loosen the PSU bracket bolts and remove the PSU.

    Tightening torque: 

    19.6 ~ 29.4 N.m (2.0 ~ 3.0 kgf.m, 14.5 ~ 21.7 lb-ft)

    Fig 10: PSU Bracket Bolts
    G00548738Courtesy of KIA MOTORS AMERICA, INC.