Kia Soul EV: AHB(Active Hydraulic Boost) System / Brake Actuation Unit Repair procedures

Kia Soul EV (PS EV) 2015-2020 Service Manual / Brake System / AHB(Active Hydraulic Boost) System / Brake Actuation Unit Repair procedures

Removal

1.	Turn ignition switch OFF and disconnect the negative (-) battery cable.

Disconnect the brake fluid level switch connector (A), and remove the reservoir cap.

Be sure to completely remove foreign substances around brake fluid reservoir and cap before opening the reservoir cap to prevent any contamination of brake fluid and deterioration in braking performance.

Using a syringe, remove the brake fluid from the reservoir.

•	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.

•	To prevent dust entering the reservoir, the reservoir cap should be closed again after removing brake fluid.

4.	Disconnect reservoir hose from the reservoir and IBAU connecter (A).

Disconnect the brake tube from the IBAU by loosening the tube flare nut (B).

Before removing the IBAU, high pressure in an accumulator of PSU should be reduced for safety by conducting "High pressure release mode" of GDS connected to SOUL EV.

Tightening torque:

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

6.	Remove the brake pedal assembly. (Refer to the brake system group - brake pedal)

Remove the IBAU mounting nuts (A) and then remove the IBAU.

Tightening torque:

12.7 ~ 15.7 N.m (1.3 ~ 1.6 kgf.m, 9.4 ~ 11.6 lb-ft)

Installation

1.	Install in the reverse order of removal.

2.	Check the brake pedal operation.

3.	After filling the brake fluid in the reservoir, perform the air bleed. (Refer to the AHB system - AHB system air bleeding)

4.	Conduct calibration after removing the brake pedal assembly. (Refer to the brake pedal - calibration)

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