NHTSA ID Number: 11014207
Manufacturer Communication Number: L-SB-0008-25
TSB/Document Date: 2025-02-12
Summary
Some 2016 – 2018 model year GS 450h, 2013 – 2016 model year LS 600h, and 2018 – 2021 model year NX 300h vehicles may exhibit a condition in which the brake, ABS
, and/or TRAC warning lights are on and/or a Check VSC message displays. One or more of the following specific Diagnostic Trouble Codes (DTCs) C1391, C1252, C1256, and/or C1253 will be stored in the vehicle memory to be used as verification. This condition may be caused by a small internal brake fluid leak inside the brake actuator.
L-SB-0008-25
January 29, 2025
ABS Brake Warning Light On
Service
Category
Brake
Section
Brake Control/Dynamic Control System
Market USA
Applicability
YEAR(S)
MODEL(S)
2016 - 2018
GS450H
2013 - 2016
LS600H
2018 - 2021
NX300H
ADDITIONAL INFORMATION
Introduction
Some 2016 – 2018 model year GS 450h, 2013 – 2016 model year LS 600h, and 2018 – 2021
model year NX 300h vehicles may exhibit a condition in which the brake, ABS, and/or TRAC warning
lights are on and/or a Check VSC message displays. One or more of the following specific Diagnostic
Trouble Codes (DTCs) C1391, C1252, C1256, and/or C1253 will be stored in the vehicle memory to
be used as verification. This condition may be caused by a small internal brake fluid leak inside the
brake actuator. Follow the Repair Procedure in this bulletin to address this condition.
Warranty Information
OP CODE
DESCRIPTION
BR2409
R & R Brake Actuator Assy
BR2410
R & R Brake Actuator Assy,
With Master Cylinder
MODEL
TIME
GS 450h
1.3
LS 600h
2.1
NX 300h
2.3
OFP
T1
T2
8C
99
44050-#####*
47050-#####*
*Warranty claim MUST be submitted with the correct 10-digit OFP. Choose the correct OFP for the vehicle being
repaired by searching for the parts in the Electronic Parts Catalog using the VIN filter.
APPLICABLE WARRANTY
This repair is covered under the Lexus Basic Warranty. This warranty is in effect for 48 months
or 50,000 miles, whichever occurs first, from the vehicle’s in-service date.
Warranty application is limited to occurrence of the specified condition described in
this bulletin.
© 2025 Lexus, a division of Toyota Motor Sales, USA
Page 1 of 4
L-SB-0008-25
January 29, 2025
Page 2 of 4
ABS Brake Warning Light On
Parts Information
MODEL
MODEL YEAR
GS 450h
2016 – 2018
2013 – 2016
LS 600h
PART NUMBER
PREVIOUS
NEW
44050-30670
04003-44930
44050-50110
04003-45450
47070-50040
04002-07150
44598-50010
2018 – 2019
47050-78120
QTY
Brake Actuator Assy
47050-78121
04004-22278
2021
47050-78310
04004-22378
2018 – 2021
47070-12020
04006-22212
1
1
Brake Booster Pump Kit,
w/ Accumulator
1
Brake Actuator Bracket Clamp
1
04004-22178
2020
NX 300h
PART NAME
1
Brake Booster Assy,
w/ Master Cylinder
1
1
Brake Booster Pump Assy
1
Required Tools & Equipment
SPECIAL SERVICE TOOLS (SST)
QTY
DOT 3 Brake Fluid
1 – 2 Liters
REQUIRED EQUIPMENT
SUPPLIER
Techstream ADVi*
Techstream 2.0
Techstream Lite
PART NUMBER
QTY
TSADVUNIT
ADE
Techstream Lite (Green Cable)
TS2UNIT
TSLITEPDLR01
TSLP2DLR01
*Essential SST.
NOTE
Only ONE of the Techstream units listed above is required.
GTS+ Software version 2024.04.004.02 or later is required.
Additional Techstream units may be ordered by calling Approved Dealer Equipment (ADE)
at 1-800-368-6787 or by visiting TIS – Diagnostics – Tools & Equipment – Techstream Order Portal.
© 2025 Lexus, a division of Toyota Motor Sales, USA
1
L-SB-0008-25
January 29, 2025
Page 3 of 4
ABS Brake Warning Light On
Repair Procedure
1. Confirm the condition exists.
Are the brake, ABS, and/or TRAC warning lights ON and/or does a Check VSC
message display?
YES — Continue to step 2.
NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
2. Using GTS+, check for and record ANY stored DTCs.
Are ANY of the following DTCs stored: C1391, C1252, C1256, and/or C1253?
YES — Continue to step 3.
NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
3. Remove the brake actuator and brake booster assembly w/ master cylinder.
Refer to TIS, applicable model and model year Repair Manual:
2013 / 2014 / 2015 / 2016 LS 600h:
Brake – Brake Control – Brake Actuator – Removal
NOTE
Procedure includes removal of the brake accumulator pump assembly.
2016 – 2018 GS 450h:
Brake – Brake Control / Dynamic Control Systems – Brake Actuator – Removal
2018 – 2020 / 2020 – 2021 NX 300h:
Brake – Brake System (Other) – Brake Booster – Removal
4. Is the vehicle an NX 300h, GS 450h, or an LS 600h?
If an NX 300h continue to step 5.
If a GS 450h or LS 600h go to step 6.
© 2025 Lexus, a division of Toyota Motor Sales, USA
L-SB-0008-25
January 29, 2025
Page 4 of 4
ABS Brake Warning Light On
Repair Procedure (continued)
5. Remove the brake booster pump assembly.
Refer to TIS, applicable model and model year Repair Manual:
2018 – 2020 / 2021 NX 300h:
Brake – Brake System (Other) – Brake Booster Pump – Removal
6. Install the NEW brake actuator and brake booster assembly w/ master cylinder.
Refer to TIS, applicable model and model year Repair Manual:
2013 / 2014 / 2015 / 2016 LS 600h:
Brake – Brake Control – Brake Actuator – Installation
NOTE
Procedure includes installation of the brake accumulator pump assembly.
2016 – 2018 GS 450h:
Brake – Brake Control / Dynamic Control Systems – Brake Actuator – Installation
2018 – 2020 / 2020 – 2021 NX 300h:
Brake – Brake System (Other) – Brake Booster – Installation
7. Is the vehicle an NX 300h, GS 450h, or an LS 600h?
If an NX 300h continue to step 8.
If a GS 450h or LS600h go to step 9.
8. Install the NEW brake booster pump assembly.
Refer to TIS, applicable model and model year Repair Manual:
2018 – 2020 / 2020 – 2021 NX 300h:
Brake – Brake System (Other) – Brake Booster Pump – Installation
9. Using GTS+, clear ANY stored DTCs and test-drive the vehicle to confirm the conditions
are no longer present.
- Mixes well with conventional fluids
- Low-moisture formula provides excellent vapor lock...
- Ideal for hydraulic and disc brakes
- Provides an extra margin of safety in extreme braking...
- Mix of polyglycol ethers ensures hot brake-system operation...
- Excellent for ABS
, disc and drum brake systems - Delivers braking power when needed by avoiding a spongy...
- Both wet and dry boiling points exceed the minimum...
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TSB/Document ID: L-SB-0008-25
Replacement Service Bulletin Number:
MFR Communication Date: 2025-01-29
MFR Internal Campaign ID/Software Version: L-SB-0008-25
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: SERVICE BRAKES
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
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