GROUP

MODEL

CHA

2020MY~
Soul (SK3)

NUMBER

DATE

104 (Rev 2, 07/13/2023)

April 2020

TECHNICAL SERVICE BULLETIN
SUBJECT:

BRAKE AIR BLEEDING PROCEDURE FOR ESC
HONKING NOISE AND SOFT/SPONGY BRAKE PEDAL

 NOTICE
This bulletin has been revised to include additional information. New/revised sections of this
bulletin are indicated by a black bar in the margin area.
This bulletin provides information regarding the brake air bleeding procedure for 2020MY~ Soul (SK3)
vehicles equipped with Electronic Stability Control (ESC) module which may exhibit a “honk” noise when using
Idle Stop and Go (ISG) and/or Hill Start Assist Control (HAC). Follow the procedure outlined in this bulletin to
perform the air bleeding brake procedures below:

A. First Manual Air Bleed Procedure – page 3
B. HCU Forced Operation Mode (using KDS) – page 4
C. Second Manual Air Bleed Procedure –page 5

Electronic Stability Control (ESC) Module

A printed copy is for reference only; publication information can be updated at any time.
Always refer to KGIS for the latest information. After logging in kdealer.com, the newest technical
publications are listed in ‘Service Releases’ and has the latest service information that has been released.

Page 2 of 7

BRAKE AIR BLEEDING PROCEDURE FOR ESC

SUBJECT:

HONKING NOISE AND SOFT/SPONGY BRAKE PEDAL
Repair Procedure:

 IMPORTANT
This procedure is to be performed by two (2) people:
Technician - Bleeds the system by manually opening and closing the brake caliper bleed screw and
detects air coming out of the brake line.
Assistant - Operates KDS and brake pedal operation inside the vehicle.

Preparation:
1.

Lift the vehicle on hoist and remove all four (4)
wheels.

2.

Connect SST 09580 3D100 (A) and SST 0K585
E8100 (B) to the vehicle and adjust the gauge
pressure to 3 bar (43.5 psi).

3.

Proceed to page 3, ‘A. 1st. Manual Air Bleed

A
+

Procedure’.

B
+

CAUTION
Before bleeding, inspect the brake lines and verify no brake line fluid leaks are present.
Always use Genuine Kia DOT 4 brake fluid from a sealed container. Do not reuse the drained
fluid.
Check that the brake fluid reservoir is always filled. Do not allow the brake fluid master to
run out of fluid while performing air bleeding.
Ensure no dirt or foreign matter contaminates the brake fluid.
Avoid brake fluid contact with painted surfaces, as damage may occur.
Verify the assistant has the brake pedal pressed down and holds before the main worker
opens/closes the caliper air bleeder screw.

Printed TSB copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.

TSB: CHA104 (Rev 2) Soul (SK3) April 2020

Page 3 of 7

BRAKE AIR BLEEDING PROCEDURE FOR ESC

SUBJECT:

HONKING NOISE AND SOFT/SPONGY BRAKE PEDAL
A. 1st. Manual Air Bleed Procedure (Strong and Rapid Pedal Force):
Follow the air bleeding order for each wheel. Start with the right rear wheel, end with the left front wheel,
and monitor the brake fluid reservoir level after each wheel is bled:
1)

CAUTION

Right Rear

Check that the brake fluid reservoir is
always filled. Do not allow the
reservoir to run out of fluid while
performing air bleeding.

2) Left Rear
3) Right Front
4) Left Front

1.

Technician – Using a clear hose, connect one
end to the brake caliper bleed screw (A) and the
other submerged in an empty container.
Note:

Ensure

that

the

bleed

screw

is

closed/tightened before proceeding.

A
+
2a.

Assistant – Apply strong and rapid brake pedal
force by following the instruction below:
•

Press and release

•

Press and release

•

Press and hold the brake pedal

2b.

Verbally notify out “stand by” to the technician.

3a.

Technician – While assistant holds the brake
pedal pressed down, slowly loosen the air
bleeding screw and allow the fluid to release.
Closely monitor for air bubbles by observing the
fluid movement within the hose.

3b.

Have the assistant verbally notify technician the
pedal has bottomed out, then tighten the air
bleed screw.

4.

Repeat steps 2 - 3 as needed, until air bubbles are no longer visible.

5.

Repeat steps 1 - 4 for the remaining three (3) brake calipers.

6.

Proceed to page 4, ‘B. HCU Forced Operation Mode (using KDS)’.
Printed TSB copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.

TSB: CHA104 (Rev 2) Soul (SK3) April 2020

Page 4 of 7

BRAKE AIR BLEEDING PROCEDURE FOR ESC

SUBJECT:

HONKING NOISE AND SOFT/SPONGY BRAKE PEDAL
B. HCU Forced Operation Mode (using KDS):
Follow the air bleeding order for each wheel. Start with the right rear wheel, end with the left front wheel,
and monitor the brake fluid reservoir level after each wheel is bled:

CAUTION
1)

Right Rear

Check that the brake fluid reservoir is
always filled. Do not allow the
reservoir to run out of fluid while
performing air bleeding.

2) Left Rear
3) Right Front
4) Left Front
1.

Technician – Using a clear hose, connect one
end to the brake caliper bleed screw (A) and the
other submerged in an empty container.
Note:

Ensure

that

the

bleed

screw

is

closed/tightened before proceeding.

A
+
2a.

Assistant – Using KDS, navigate to S/W
Management → Systems → ABS/ESP, then
select ‘HCU Air Bleeding Mode’.

2b.

Notify the Technician before starting, then
select ‘OK’.

CAUTION
Check that the brake fluid reservoir is
always

filled.

Do

not

allow

the

reservoir to run out of fluid while
performing air bleeding.

Printed TSB copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.

TSB: CHA104 (Rev 2) Soul (SK3) April 2020

Page 5 of 7

BRAKE AIR BLEEDING PROCEDURE FOR ESC

SUBJECT:

HONKING NOISE AND SOFT/SPONGY BRAKE PEDAL
3.

Perform the following steps simultaneously as outlined:
a)

Technician - Open the bleed screw as the HCU is operated by KDS.

b)

Assistant - Press down on the brake pedal with strong force at regular intervals while HCU is
operated by KDS.

c)

Technician - Proceed with air bleeding until the air bubbles are no longer present.

d)

Assistant - When HCU forced operation is completed, verbally notify the technician to stop.

e)

Technician – Tighten the caliper bleed screw.

4.

Repeat step 3 for the remaining three (3) wheels to complete the HCU Forced Operation Mode.

5.

Proceed below to ‘C. 2nd. Manual Air Bleed Procedure’.

C. 2nd. Manual Air Bleed Procedure (Strong and Rapid Pedal Force):
Follow the air bleeding order for each wheel. Start with the right rear wheel, end with the left front wheel,
and monitor the brake fluid reservoir level after each wheel is bled:
1)

CAUTION

Right Rear

Check that the brake fluid reservoir is
always filled. Do not allow the
reservoir to run out of fluid while
performing air bleeding.

2) Left Rear
3) Right Front
4) Left Front

1.

Technician – Using a clear hose, connect one
end to the brake caliper bleed screw (A) and the
other submerged in an empty container.
Note:

Ensure

that

the

bleed

screw

is

closed/tightened before proceeding.

A
+
2a.

Assistant – Apply strong and rapid brake pedal
force by following the instruction below:

2b.

•

Press and release

•

Press and release

•

Press and hold the brake pedal

Verbally notify out “stand by” to the technician.

Printed TSB copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.

TSB: CHA104 (Rev 2) Soul (SK3) April 2020

Page 6 of 7

BRAKE AIR BLEEDING PROCEDURE FOR ESC

SUBJECT:

HONKING NOISE AND SOFT/SPONGY BRAKE PEDAL
3a.

Technician – While assistant holds the brake
pedal pressed down, slowly loosen the air
bleeding screw and allow the fluid to release.
Closely monitor for air bubbles by observing the
fluid movement within the hose.

3b.

Have the assistant verbally notify technician the
pedal has bottomed out, then tighten the air
bleed screw.

4.

Repeat steps 2 - 3 as needed, until air bubbles are no longer visible.

5.

Repeat steps 1 - 4 for the remaining three (3) brake calipers.

6.

Check the brake pedal stroke.
Brake Pedal Stroke Specification:
5.3149 ± 0.1181 in. (135 ± 3mm)

•

If brake pedal stroke meets specification (OK), remove the SST to complete the air bleeding
procedure.

•

If brake pedal stroke does not meet specification (NG), repeat the Second Manual Air Bleed
Procedure.

Printed TSB copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.

TSB: CHA104 (Rev 2) Soul (SK3) April 2020

Page 7 of 7

BRAKE AIR BLEEDING PROCEDURE FOR ESC

SUBJECT:

HONKING NOISE AND SOFT/SPONGY BRAKE PEDAL
AFFECTED VEHICLE RANGE:
Model

Production Date Range

Soul (SK3)

November 1, 2018 ~

REQUIRED TOOL:
Tool Name

Part Number

AHB Brake Bleeding Tool

09580 3D100

Figure

Comments

Located in
SST Cabinet
Drawer #7
Brake Bleeder Adapter

0K585 E8100

For replacements, contact Snap-On Business Solutions at (888) 542-1011.

REQUIRED PART:
Part Name

Part Number

Brake Fluid

Figure

Qty.

UM010 CH043

DOT4

3 bottles (Max.)

WARRANTY INFORMATION:
N Code: Q41 C Code: ZZ3
Claim
Type
W

Causal P/N

Qty.

58910 K0100

0

Repair

Labor Op

Op

Replacement

Description

Code

Time

P/N

ESC System Air Bleeding

58670F04

1.7
M/H

N/A

Qty.

0

Printed TSB copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.

TSB: CHA104 (Rev 2) Soul (SK3) April 2020