GROUP
CHA

MODEL
2020MY~
Soul (SK3)

NUMBER
104

DATE
May 2020

TECHNICAL SERVICE BULLETIN
BRAKE AIR BLEEDING PROCEDURE
FOR ESC HONKING NOISE

SUBJECT:

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 air bleeding brake procedures below:




Conventional Brake Bleeding Procedure (apply normal brake pedal force) – page 3
Panic Braking Bleeding Procedure (apply strong brake pedal force) – page 4
HCU Forced Operation Mode (using KDS) – page 5

Electronic Stability Control (ESC) Module

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

X General Manager


X Service Advisors


X Technicians


X Service Manager


X Parts Manager


X Body Shop Manager 
X Fleet Repair


Page 2 of 7
SUBJECT:

BRAKE AIR BLEEDING PROCEDURE FOR ESC HONKING NOISE

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.
1.

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

2.

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

A
B

CAUTION
Before bleeding, inspect the brake lines and verify no brake line fluid leaks are
present.
Always use genuine 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 Soul (SK3) May 2020

Page 3 of 7

BRAKE AIR BLEEDING PROCEDURE FOR ESC HONKING NOISE

SUBJECT:

Conventional Air Bleed Procedure (apply normal brake 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)
2)
3)
4)
3.

Right Rear
Left Rear
Right Front
Left Front

Technician – using a clear hose,
connect one end to the brake caliper
bleed screw (C) and the other
submerged in an empty container.
Note: Ensure that the bleed screw is
closed/tightened before proceeding.

C
4a. Assistant – Apply normal brake pedal
force by following the instruction below:




Press and release
Press and release
Press and hold the brake pedal

4b. Verbally notify out “stand by” to the
technician.

5a. 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.
5b. Have the assistant verbally notify
technician the pedal has bottomed out,
then tighten the air bleed screw.
6.

Repeat steps 4 - 5 as needed, until air
bubbles are no longer visible.

7.

Repeat steps 3 - 6 for the remaining
three (3) brake calipers.
Printed TSB copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.

TSB: CHA104 Soul (SK3) May 2020

Page 4 of 7

BRAKE AIR BLEEDING PROCEDURE FOR ESC HONKING NOISE

SUBJECT:

Panic Brake Mode Air Bleed Procedure (apply strong brake 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)
2)
3)
4)
8.

Right Rear
Left Rear
Right Front
Left Front

Technician – using a clear hose,
connect one end to the brake caliper
bleed screw (C) and the other
submerged in an empty container.
Note: Ensure that the bleed screw is
closed/tightened before proceeding.

C
9.

Assistant - Repeat step 4, this time
apply strong pedal force instead.

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

10. 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.
Have the assistant verbally notify
technician the pedal has bottomed out,
then tighten the air bleed screw.
11. Repeat steps 9 - 10 as needed, until air
bubbles are no longer visible.
12. Repeat steps 8 - 11 for the remaining
three (3) brake calipers.
Printed TSB copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.

TSB: CHA104 Soul (SK3) May 2020

Page 5 of 7

BRAKE AIR BLEEDING PROCEDURE FOR ESC HONKING NOISE

SUBJECT:

HCU Forced Operation Mode (using KDS)
Follow the air bleeding order for each wheel (starting with the right rear wheel and ending
with the left front wheel) and monitor the brake fluid reservoir usage after each wheel is bled:
1)
2)
3)
4)

Right Rear
Left Rear
Right Front
Left Front

13. Technician – using a clear hose,
connect one end to the brake caliper
bleed screw (C) and the other
submerged in an empty container.
Note: Ensure that the bleed screw is
closed/tightened before proceeding.

C
14. Assistant – In the S/W Management
using KDS, select ‘HCU Air Bleeding
Mode’ in the ABS/ESP system.

Notify the Technician before starting
and select ‘OK’.

CAUTION
Check 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 Soul (SK3) May 2020

Page 6 of 7
SUBJECT:

BRAKE AIR BLEEDING PROCEDURE FOR ESC HONKING NOISE

15. Perform
the
following
simultaneously as outlined:

steps

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.
16. Repeat step 15 for the remaining three
(3) wheels to complete the HCU Forced
Operation Mode.
17. Repeat the Conventional Air Bleed
Procedure on page 3.
18. Repeat the Panic Brake Mode Air
Bleed Procedure on page 4.
19. Check the brake pedal stroke.
If the brake pedal stroke does not meet
the specification, repeat steps 17 and 18.
If the brake pedal stroke does meet the
specification, remove the SST to
complete the air bleeding procedure.
Brake Pedal Stroke Specification:
5.3149 ± 0.1181 in. (135 ± 3mm)
Printed TSB copy is for reference only; information may be updated at any time. Always refer to KGIS for the latest information.

TSB: CHA104 Soul (SK3) May 2020

Page 7 of 7
SUBJECT:

BRAKE AIR BLEEDING PROCEDURE FOR ESC HONKING NOISE

AFFECTED VEHICLE RANGE:
Model

Production Date Range

Soul (SK3)

November 1, 2018 ~

REQUIRED TOOL:
Tool Name

Figure

Comments

SST 09580 3D100

Located in
SST Cabinet Drawer #7

SST 0K585 E8100

REQUIRED PART:
Part Name

Part Number

Brake Fluid

UM010 CH043

Figure

Qty.

3 (Max.)

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

Causal P/N

Qty.

Repair
Description

Labor Op
Code

Op
Time

Replacement
P/N

Qty.

W

58910 K0100

0

ESC System Air Bleeding

58670F04

1.7
M/H

N/A

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 Soul (SK3) May 2020