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Home >> Kia >> 2012 >> Optima Hybrid >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Active Hydraulic Booster (AHB) System - HEV >> Hydraulic Power Unit >> Repair procedures >> Removal

Repair procedures: Removal

  1. Turn ignition switch OFF and disconnect the negative (-) battery cable.
  2. Remove the air duct (B) and air cleaner assembly (A).
    Fig 1: Identifying Air Duct And Air Cleaner Assembly
    G08308670Courtesy of KIA MOTORS AMERICA, INC.
  3. Disconnect a connector (B) and loosen the wiring harness mounting nuts. Then pivot the wiring harness (A) side out of the way.
    Fig 2: Identifying Connector And Wiring Harness
    G08308671Courtesy of KIA MOTORS AMERICA, INC.
  4. Remove the brake actuation unit.

    (Refer to BRAKE ACTUATION UNIT )

  5. Remove the hydraulic booster reservoir hose(A).
    Fig 3: Identifying Hydraulic Booster Reservoir Hose And Bolt
    G08308672Courtesy of KIA MOTORS AMERICA, INC.
  6. Disconnect the brake tube from the hydraulic power unit by loosening the bolt (B).

    Tightening torque: 

    29.4 ~ 34.3 N.m (3.0 ~ 3.5 kgf.m, 21.7 ~ 25.3 lb-ft)

  7. Loosen the hydraulic power unit bracket bolts (A), then remove hydraulic power unit and bracket.

Tightening torque: 

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

Fig 4: Identifying Hydraulic Power Unit Bracket Bolts
G08308673Courtesy of KIA MOTORS AMERICA, INC.