GROUP
CAMPAIGN
DATE
DECEMBER 2022

NUMBER
22-01-094G
MODEL(S)
G70 (IK)

Technical Service Bulletin
SUBJECT:

 IMPORTANT

HYDRAULIC CONTROL UNIT AIR BLEEDING
(SERVICE CAMPAIGN T31G)
*****DEALER STOCK ONLY*****

Dealers must perform this service campaign on all affected vehicles prior to customer
retail delivery.
Access the "Warranty Information" screen via WEBDCS to identify open campaigns.
Description: This bulletin describes the procedure to perform an Hydraulic Control Unit (HCU) Air
Bleeding on certain 2023MY G70 (IK) models to reduce the soft brake pedal feel.

Applicable Vehicles: Certain 2023MY G70 (IK) produced from April 02, 2022 to June 02, 2022

STUI
This TSB includes STUI pictures as a requirement. Where indicated, please include the last
6 digits of the VIN and date of repair on a piece of paper. Ensure the VIN and date of repair
are clearly visible. Finally, please ensure all captured pictures are completed according to
the steps in this TSB and uploaded to STUI. All claims submitted that have illegible,
incomplete, missing, or incorrect picture(s) are subject to debit.
Circulate To: General Manager, Service Manager, Parts Manager, Warranty Manager, Service
Advisors, Technicians, Body Shop Manager, Fleet Repair

SUBJECT:

HYDRAULIC CONTROL UNIT AIR BLEEDING (SERVICE CAMPAIGN T31G)

Parts Information:
Part Number

Part Description

Photo

Remarks
Requires approximately
1 1/4 bottles
(16 FL.OZ.) of brake
fluid per vehicle

DOT 4 Brake Fluid
(12 FL.OZ., 355ML)

00232-19053

Special Service Tools:
Part Number

Tool Name

Photo

Remarks

09580-3D100

Brake Air Bleeding
Tool

-

0K585-E8100

Brake Air Bleeding
Tool Adapter

-

Recommended Tools and Equipment:
Tool Name

Photo

Remarks
•

Brake Fluid Catch Can
with a Clear Tube
Warranty Information:
Model
Op. Code

G70 (IK)

20D173R0

•

Use a clear tube to view air
bubbles exiting the caliper.
The catch can should be
partially filled with brake fluid.

Operation

Op. Time

Causal Part

Nature
Code

Cause
Code

BRAKE AIR BLEEDING
OPERATION (ABS)

0.6 M/H

58920-G9BE0

D75

ZZ3

NOTE 1: Submit claim on Campaign Claim Entry screen.
NOTE 2: If a part is found in need of replacement while performing the repair for this campaign and
the affected part is still under warranty, submit a separate claim using the same repair order. If the
affected part is out of warranty, submit a Prior Approval request for goodwill consideration prior to
performing the work.
NOTE 3: 2 bottles of brake fluid will be reimbursed under labor op 20D173R0.
NOTE 4: Op time includes taking STUI pictures and uploading. The STUI photos must be taken as
directed on page 12. If not included, claim will be subject to debit.

TSB #: 22-01-094G

Page 2 of 12
SUBJECT:

SUBJECT:

HYDRAULIC CONTROL UNIT AIR BLEEDING (SERVICE CAMPAIGN T31G)

NOTICE
•
•
•
•
•

Do not reuse drained fluid.
Always use genuine DOT4 brake fluid. Using non-genuine DOT4 brake fluid can cause
corrosion and decrease the life of the brake system.
Verify that dirt or other foreign matter does not contaminate the brake fluid.
Do not spill brake fluid onto the vehicle. This may lead to paint damage. If brake fluid contacts
any paint surface, wash the surface off immediately with water.
The reservoir on the master cylinder must be at the MAX (upper) level mark at the start of
bleeding procedure and checked after bleeding each brake caliper. Add fluid as required.

Service Procedure:
This procedure requires a two-step bleeding process:
1. Manual Brake Bleeding
2. GDS-M HCU Air Bleeding
Manual Brake Bleeding
1.

Lift the vehicle on a hoist and remove all four
wheel/tire assemblies.
Wheel Lug Nut Tightening Torque

lb-ft • 65.1-79.6
kgf.m • 9.0-11.0
N.m • 88.3-107.9

NOTICE
•
•

2.

Ensure the brake fluid in the master cylinder reservoir is at the MAX (upper) level mark.
Check the master cylinder reservoir after bleeding each brake caliper. Add fluid as required to
the MAX (upper) level mark.
Start at the Front Right brake caliper.

Brake Bleeding Order
TSB #: 22-01-094G

Page 3 of 12
SUBJECT:

SUBJECT:

HYDRAULIC CONTROL UNIT AIR BLEEDING (SERVICE CAMPAIGN T31G)

3.. Connect the hose of the catch can to the bleed
screw (A) of the caliper.

NOTICE
For Brembo calipers, bleed the inner bleed
screw first, then bleed the outer.

A

Bleed Screw Tightening Torque
Standard Brakes (17in rotor)

lb-ft • 5.1-9.4
kgf.m • 0.7-1.3
N.m • 6.9-12.7
Mando Brakes (18in rotor)

lb-ft • 10.1-14.5
kgf.m • 1.4-2.0
N.m • 13.7-19.6

Brembo Brakes (18in rotor)

lb-ft • 12.3-14.5
Brembo

kgf.m • 1.7-2.0
N.m • 16.7-19.6

Outer

Inner

Front Caliper

Inner

Outer

Rear Caliper
TSB #: 22-01-094G

Page 4 of 12
SUBJECT:

SUBJECT:

4.

HYDRAULIC CONTROL UNIT AIR BLEEDING (SERVICE CAMPAIGN T31G)

Have an assistant pump the brake pedal at least
three times and then hold the pedal down.
While the brake pedal is down, open the bleed
screw to release the brake fluid.
After the fluid and bubbles have been released
from the caliper, tighten the bleed screw. Then
have the assistant release the brake pedal.
Repeat until bubbles are no longer visible in the
catch can hose.
Check the master cylinder reservoir level. Add
brake fluid as necessary.

5.

Move to the Rear Left and repeat the
procedures in steps 3 and 4.
Repeat the procedures in steps 3 and 4 for the
Front Left then the Rear Right.

6.

Refill the master cylinder reservoir to MAX
(upper) level line.
Continue to GDS-M HCU Air Bleeding.

TSB #: 22-01-094G

Page 5 of 12
SUBJECT:

SUBJECT:

HYDRAULIC CONTROL UNIT AIR BLEEDING (SERVICE CAMPAIGN T31G)

GDS-M HCU Air Bleeding
1.

With the air flow valve closed (as shown in image below), connect pressurized brake bleeder tool
(09580-3D100) to the brake fluid reservoir using the adapter (0K585-E8100).
Air flow valve
(closed)

SST 0K585-E8100
2.

SST 09580-3D100

Pressure
regulator

Compressed air

With the air flow valve closed, connect a
compressed air source. Regulate the air
pressure on the brake bleed tool to 3 bar
(approximately 44 psi). Open the air flow valve
to pressurize the brake system.
After the system is pressurized, inspect the
master cylinder reservoir, brake lines and fittings
for leaks. Repair any leaks found before
continuing with bleeding procedure.

3 bar
(44 psi)

NOTICE
•
•
•

Always keep the air flow valve closed when
connecting to a compressed air source.
Open the air flow valve as the last step.
Close the air flow valve first before
removing the compressed air source.
To remove the adapter from the master
cylinder:
1. Close the air flow valve.
2. Remove the compressed air source.
3. Slowly open the air flow valve to release
the pressure from the tool.
4. Remove the adapter.

TSB #: 22-01-094G

Page 6 of 12
SUBJECT:

SUBJECT:

HYDRAULIC CONTROL UNIT AIR BLEEDING (SERVICE CAMPAIGN T31G)

3.

Connect the GDS-M to the vehicle and select the
“HECU Air Bleeding Mode” from “S/W
Management”.

4.

Press the “OK” button.

TSB #: 22-01-094G

Page 7 of 12
SUBJECT:

SUBJECT:

5.

HYDRAULIC CONTROL UNIT AIR BLEEDING (SERVICE CAMPAIGN T31G)

Do not follow the procedures stated in the
GDS-M.
Press the “OK” button.

6.

Start at the Front Right brake caliper.

Brake Bleeding Order

TSB #: 22-01-094G

Page 8 of 12
SUBJECT:

SUBJECT:

HYDRAULIC CONTROL UNIT AIR BLEEDING (SERVICE CAMPAIGN T31G)

7.. Connect the hose of the catch can to the bleed
screw (A) of the caliper and open the bleed
screw.

NOTICE
For Brembo calipers, bleed the inner bleed
screw first, then bleed the outer.

A

Bleed Screw Tightening Torque
Standard Brakes (17in rotor)

lb-ft • 5.1-9.4
kgf.m • 0.7-1.3
N.m • 6.9-12.7
Mando Brakes (18in rotor)

lb-ft • 10.1-14.5
kgf.m • 1.4-2.0
N.m • 13.7-19.6

Brembo Brakes (18in rotor)

Brembo

lb-ft • 12.3-14.5
kgf.m • 1.7-2.0

Outer

Inner

N.m • 16.7-19.6

Front Caliper

Inner

Outer

Rear Caliper
TSB #: 22-01-094G

Page 9 of 12
SUBJECT:

SUBJECT:

8.

HYDRAULIC CONTROL UNIT AIR BLEEDING (SERVICE CAMPAIGN T31G)

Do not follow the procedures stated in the
GDS-M.
Press the appropriate, C1 to C4, button for the
caliper to begin air bleeding.
Air bleeding starts with the sound of the motor.
The motor will activate for 10 seconds, pause,
then activate again for a total of 20 seconds.

9.

Watch for air bubbles coming out of the caliper
through the catch can tube.
If bubbles are still present after the HCU motor
stops, restart the HCU bleeding procedure for
that wheel position.

NOTICE
For Brembo calipers, bleed the inner bleed
screw first, then bleed the outer.
If bubbles are no longer present after the HCU
motor stops, tighten the bleed screw to
specification.

NOTICE
Always maintain proper brake fluid level in the
master cylinder reservoir.

TSB #: 22-01-094G

Page 10 of 12
SUBJECT:

SUBJECT:

HYDRAULIC CONTROL UNIT AIR BLEEDING (SERVICE CAMPAIGN T31G)

10. Move to the Rear Left caliper.
Repeat the procedures from steps 7 to 9 in this
GDS-M HCU Air Bleeding section.
Ensure the correct button is pressed for each
caliper position.

11. Repeat the procedures from steps 7 to 9 in this
GDS-M HCU Air Bleeding section for the Front
Left then the Rear Right.
12. At the completion of the HCU Air Bleeding at the
Rear Right caliper and before removing the
catch can, follow the STUI photo procedure.

Using STUI, take clear photos of the
following two items with the last 6 digits of
the VIN and the date of repair on a piece of
paper. See examples shown to the right.
1. Catch can connected to the Rear
Right caliper.
2. Brake air bleeding tool connected to
the master cylinder reservoir.
Upload the photos to STUI.

TSB #: 22-01-094G

Page 11 of 12
SUBJECT:

SUBJECT:

HYDRAULIC CONTROL UNIT AIR BLEEDING (SERVICE CAMPAIGN T31G)

13. After HCU Air Bleeding is complete, ensure the
brake fluid in the master cylinder reservoir is at
the MAX (upper) level line.
14. Reinstall all four tire/wheel assemblies.
15. The service procedure is now complete.

TSB #: 22-01-094G

Page 12 of 12
SUBJECT: