Brake System
Brake Control Unit Repair Procedures
In this manual: Brake System
13steps
~78min
3/5difficulty
Done 0 of 13
Removal
- Turn the ignition switch OFF and disconnect the negative (-) battery cable.
- Remove the air duct (A).
- Remove the air cleaner assembly (B).
- 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.
- 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.
- Disconnect the reservoir hose from the reservoir and the IBAU connector (A).
- Disconnect the brake tube from the IBAU by loosening the tube flare nut (B).
Tightening Torque: 13.7 ~ 16.7 N·m
- Remove the brake pedal assembly. (Refer to Brake System - Brake Pedal)
- Remove the IBAU mounting nuts (A), then remove the IBAU.
Tightening torque: 12.7 - 15.7 N·m
Installation
- Installation is the reverse of removal.
- Check the brake pedal operation.
- After filling the reservoir with brake fluid, bleed the air. (Refer to Brake System - Brake Bleeding Procedures)
- Perform calibration after removing the brake pedal assembly. (Refer to Brake Pedal - Calibration)
Test yourself
A quick Kia Optima Hybrid Owner's Manual quiz: every answer comes with an explanation and a link to the manual page.
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