Kia Optima Hybrid Owner's Manual Quiz
Brake System

Power Supply Unit Repair Procedures

In this manual: Brake System
General Information — 4Engine Mechanical System — 50Engine Electrical System — 20Emission Control System — 30Engine Control System/Fuel System — 84Automatic Transmission — 98Drive Shaft and Axle — 15Suspension System — 36Steering — 12Restraints — 50Brake System — 38Body (Interior and Exterior) — 54Body Electrical System — 233Heating, Ventilation, and Air Conditioning — 57
21steps
~126min
5/5difficulty
0102030405016.712N·mlb·ft
Tightening torque found on this page
Done 0 of 21

Removal

  1. Turn the ignition switch OFF and disconnect the negative (-) battery cable.
  2. Remove the air duct (A).
  3. Remove the air cleaner assembly (B).
  4. Disconnect the brake fluid level switch connector (A) and remove the reservoir cap.
    Be sure to completely remove foreign material around the brake fluid reservoir and cap before opening the cap. If not, brake fluid may become contaminated and braking performance may deteriorate.
  5. Remove the brake fluid from the reservoir using a syringe.
    • Do not spill brake fluid on the vehicle, as it may damage the paint. If brake fluid gets on the paint, wash it off immediately with water.
    • To prevent dust from entering the reservoir, close the reservoir cap again after removing the brake fluid.
  6. Remove the IBAU (Refer to AHB System - Integrated Brake Actuator Unit (IBAU))
  7. Disconnect the connector (A) and, after removing the mounting clip, disconnect the reservoir hose (B).
  8. Disconnect the brake tube from the power supply unit by loosening the bolt (B).
  9. After disconnecting the connector, loosen the PSU bracket bolts and remove the PSU.

    Torque: 19.6 ~ 29 N·m

Installation

  1. Installation is the reverse of removal.
  2. Check the brake pedal operation.
  3. After filling the reservoir with brake fluid, perform bleeding. (Refer to AHB System - Bleeding the AHB System)
  4. Perform calibration after removing the brake pedal assembly. (Refer to Brake Pedal - Calibration)
  5. Tighten the PSU bracket bolts and the brake tube to the specified torque.
  6. Perform calibration after removing or installing the PSU.
  7. Connect GDS. (CAN line or OBD connector)
  8. Turn the ignition on.
  9. Press the pressure sensor calibration button.
  10. Perform the pressure sensor calibration procedure. (Calibration records, DTC erasure)
  11. Turn the ignition off and back on after the calibration procedure.
  12. Confirm that calibration was successful.
Pressure Sensor Calibration: The pressure sensor installed in the power supply unit calculates pressure based on its initial zero point. Therefore, initial zero point adjustment is required when installing for the first time. After replacing the PSU (the sensor cannot be replaced separately), calibration must be performed. Calibration procedure

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