KIA Niro: Brake Actuation Unit Repair procedures

Kia Niro - First generation - (DE) (2017-2022) - Service and Repair Manual / Brake System / AHB(Active Hydraulic Boost) System / Brake Actuation Unit Repair procedures

Brake Actuation Unit Components and components location

Warning

Warning

IBAU(Intergrated Brake Actuation Unit) must not be disassembled.

  1. Integrated Brake Actuation Unit (IBAU) ECU
  2. Reservoir
  3. Pedal Simulator
  4. Integrated Brake Actuation Unit (IBAU)

Brake Actuation Unit Repair procedures

Removal

Warning

The following section describes how to diagnose faults using a diagnostic instrument.

1) Connect self-diagnosis connector (16pins) located under the driver side crash pad to self-diagnosis device, and then turn the self-diagnosis device after key is ON.

2) Select the "vehicle model" and "ESC/AHB" on KDS vehicle selection screen.

3) Select the "High Pressure Release Mode" on KDS screen, then select OK.

4) Proceed with the test according to the screen instructions.

  1. Turn ignition switch OFF and disconnect the negative (-) battery terminal.
  2. Disconnect the ECM & TCM bracket.

    (Refer to Engine Control System - "Engine Control Module (ECM)")

  3. Remove the air cleaner assembly.

    (Refer to Engine Mechanical System - "Air Cleaner")

  4. Remove the brake fluid from the master cylinder reservoir with a syringe.

Warning

Do not spill brake fluid on the vehicle as it may damage the paint. If brake fluid comes in contact with the paint, wash off immediately with water.

  1. Remove the nuts (A), hose (B), brake fluid level sensor connector (C).

Tightening torque: 6.8 - 10.7 N*m (0.7 - 1.1 kgf*m, 5.0 - 7.9 lb*ft)

  1. Disconnect the integrated brake actuation unit (IBAU) connector (A) and brake tube (B).

  1. Loosen the flare nuts (A) from the integrated brake actuation unit (IBAU) and then remove the brake tube.

Tightening torque: 12.7 - 16.7 N*m (1.3 - 1.7 kgf*m, 9.4 - 12.3 lb*ft)

  1. Remove the snap pin (A) and clebis pin (B).

  1. Loosen the brake pedal nuts.

Tightening torque : 16.7 - 25.5 N*m (1.7 - 2.6 kgf*m, 12.3 - 18.8 lb*ft)

Installation

Installation

  1. Installation is the reverse of removal.
  2. Check the brake pedal operation.
  3. After filling the brake fluid in the reservoir, perform the air bleed.

    (Refer to the Brake system - "Brake Bleeding Procedure")

  4. Conduct the variant coding.
  5. Conduct the pedal traval sensor (PTS) calibration.
  6. Conduct the longitidinal G sensor clibration. (HAC/DBC Only)
  7. Conduct the pressure sensor calibration.
  8. Conduct the auto detected configuration reset the if necessary.

Diagnosis by using diagnostic device

The following section describes how to diagnose faults using a diagnostic instrument.

  1. Connect self-diagnosis connector (16pins) located under the driver side crash pad to self-diagnosis device, and then turn the selfdiagnosis device after key is ON.
  2. Select the "vehicle model" and "ESC/AHB" on KDS vehicle selection screen.
  3. Proceed with the test according to the screen instructions.

Longitudinal G Sensor Calibration(HAC/DBC Only)

Pressure Sensor Calibration

Pressure Sensor Calibration

Pedal Travel Sensor (PTS) Calibration

Pedal Travel Sensor (PTS) Calibration

Auto Detected Configuration Reset(ESP(ESC) Only)

Auto Detected Configuration Reset(ESP(ESC) Only)

ESC Variant Coding

ESC Variant Coding

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