NHTSA ID Number: 10245447
Manufacturer Communication Number: L-SB-0032-23 Rev
TSB/Document Date: 2023-11-27
Summary
TSB: Some 2016 ? 2022 model year RX 450h and 2018 ? 2022 model year RX 450hL vehicles may exhibit a squawk/knock noise from the engine compartment when depressing and/or releasing the brake pedal. Follow the Repair Procedure in this bulletin to address this condition.
L-SB-0032-23
Rev1
May 15, 2023
Brake Squawk/Knock Noise
Service
Category
Brake
Market USA and
Section
Brake Control/Dynamic Control System
Mexico
Applicability
YEAR(S)
MODEL(S)
2016 - 2022
RX450H
ADDITIONAL INFORMATION
REVISION NOTICE
October 02, 2023 Rev1:
The Warranty Information, Parts Information, and Repair Procedure sections have
been updated.
Any previous printed versions of this bulletin should be discarded.
SUPERSESSION NOTICE
The information contained in this bulletin supersedes Service Bulletins L-SB-0004-19,
L-SB-0005-21, and L-SB-0035-21.
The market indicator has been updated to include the Mexico market.
The Calibration has been updated.
Service Bulletins L-SB-0004-19, L-SB-0005-21, and L-SB-0035-21 are obsolete, and any printed
versions should be discarded.
Introduction
Some 2016 – 2022 model year RX 450h and 2018 – 2022 model year RX 450hL vehicles may
exhibit a squawk/knock noise from the engine compartment when depressing and/or releasing the
brake pedal. Follow the Repair Procedure in this bulletin to address this condition.
© 2023 Lexus
, a division of Toyota Motor Sales, USA
Page 1 of 30
L-SB-0032-23
Rev1
May 15, 2023
Page 2 of 30
Brake Squawk/Knock Noise
Table of Contents
Warranty Information ...............................................................................................................3
For USA Market .................................................................................................................3
For Mexico Market .............................................................................................................3
Parts Information .....................................................................................................................4
For USA and Mexico Markets.............................................................................................4
Required Tools & Equipment ...................................................................................................5
Calibration Information.............................................................................................................6
Repair Procedure ....................................................................................................................6
© 2023 Lexus, a division of Toyota Motor Sales, USA
L-SB-0032-23
Rev1
May 15, 2023
Page 3 of 30
Brake Squawk/Knock Noise
Warranty Information
For USA Market
OP CODE
MODEL YEAR
DESCRIPTION
TIME
BR1919
2016 – 2022
Brake Actuator Replacement
& Brake Bleed
3.8
Reprogram ECU
0.3
R & R Master Cylinder Reservoir
1.2
Combo A
Combo B
2016 – 2018
OFP
T1
T2
44050-#####*
91
99
*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.
For 2019 – 2022 model year RX 450h and RX 450hL vehicles equipped with a California Certified
Emission Control System that are registered and operated in California or ANY state that adopts
California emission warranty — California Emission Long-Term Defect Warranty is in effect for
7 years or 70,000 miles from the vehicle’s in-service date, whichever occurs first.
(Please reference Policy 4.7, and/or the Owner’s Warranty & Maintenance Guide for
additional information).
For Mexico Market
OP CODE
MODEL YEAR
DESCRIPTION
TIME
BR1919
2016 – 2022
Brake Actuator Replacement
& Brake Bleed
3.8
Reprogram ECU
0.3
R & R Master Cylinder Reservoir
1.2
Combo A
Combo B
2016 – 2018
OFP
T1
T2
44050-#####*
91
99
*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 80,000 kilometers, whichever occurs first, from the vehicle’s in-service date.
Warranty application is limited to occurrence of the specified condition described in
this bulletin.
© 2023 Lexus, a division of Toyota Motor Sales, USA
L-SB-0032-23
Rev1
May 15, 2023
Page 4 of 30
Brake Squawk/Knock Noise
Parts Information
For USA and Mexico Markets
PART NUMBER
PART NAME
QTY
Reservoir Assy, Master Cylinder
1
44050-#####
Actuator Assy, Brake
1
895B0-48030
895B0-48031
Computer Assy, Skid Control ECU
–
00475-1BF03
5 – 10 bottles
31478-30010
Bleeder Plug Caps
1 (10 per pack)
44511-58010
Plugs Brake Actuator
1
PREVIOUS
NEW
47220-48270
47220-48271
NOTE
The skid control ECU should NOT be replaced as part of the Repair Procedure.
© 2023 Lexus, a division of Toyota Motor Sales, USA
L-SB-0032-23
Rev1
May 15, 2023
Page 5 of 30
Brake Squawk/Knock Noise
Required Tools & Equipment
REQUIRED EQUIPMENT
SUPPLIER
PART NUMBER
Techstream ADVI*
QTY
TSADVUNIT
Techstream 2.0
TS2UNIT
ADE
1
Techstream Lite
TSLITEPDLR01
Techstream Lite (Green Cable)
TSLP2DLR01
*Essential SST.
NOTE
Only ONE of the Techstream units listed above is required.
GTS+ software version 2023.03.002.02 or later is required.
Additional Techstream units may be ordered by calling Approved Dealer Equipment (ADE)
at 1-800-368-6787 (USA) or 01-55-50103041 (Mexico).
Use GTS+ or an approved J2534 interface to perform flash reprogramming updates.
Visit techinfo.toyota.com for more information regarding J2534 reprogramming.
SPECIAL SERVICE TOOLS (SST)
PART NUMBER
QTY
Battery Diagnostic Tool*
DCA-8000P T
1
Hose Plug No. 2**
09053-1C220
1 – 2***
*Essential SST.
**ONLY reuse the hose plugs if there is no debris on them, they have ONLY been used for brake fluid, they are
thoroughly washed AFTER use, and they are stored once completely dry.
***Two plugs are required if replacing the master cylinder reservoir. If ONLY replacing the actuator, ONE plug is required.
NOTE
Additional SSTs may be ordered by calling 1-800-933-8335 (USA) or 01-800-504-5330 (Mexico).
© 2023 Lexus, a division of Toyota Motor Sales, USA
L-SB-0032-23
Rev1
May 15, 2023
Page 6 of 30
Brake Squawk/Knock Noise
Calibration Information
MODEL
YEARS
CALIBRATION
ID NUMBER
CALIBRATION ID
PREVIOUS
NEW
F152648501
CID 1
F152648502
F152648740
2016 – 2017
F152648G20 / F152648G30
F152648511
RX 450h
CID 2
F152648512
F152648750
CID 1
F152648504
CID 2
F152648514
2018
F152648G40 / F152648G50
Repair Procedure
1. Confirm the condition exists.
Is there a squawk/knock noise from the engine compartment when depressing and/or
releasing the brake pedal?
YES — Continue to step 2.
NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
2. Are ANY DTCs stored related to a noise present during brake application?
YES — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
NO — Continue to step 3.
3. Is the vehicle a 2016 – 2018 model year RX 450h?
YES — Continue to step 4.
NO — Go to step 7.
4. Use GTS+ to confirm if the skid control ECU calibration has been updated.
Is the calibration ID listed in GTS+ the latest skid control ECU calibration?
YES — Go to step 7.
NO — Continue to step 5.
© 2023 Lexus, a division of Toyota Motor Sales, USA
L-SB-0032-23
Rev1
May 15, 2023
Page 7 of 30
Brake Squawk/Knock Noise
Repair Procedure (continued)
5. Flash reprogram the skid control ECU.
NOTE
The battery diagnostic tool MUST be used in Power Supply Mode to maintain battery voltage at
13.5V while flash reprogramming the vehicle.
For details on how to use the battery diagnostic station, refer to the DCA-8000 Instruction Manual
located at TIS – Diagnostics – Tools & Equipment – Battery Diagnostics.
Follow the procedures outlined in L-SB-0001-18, GTS+ Techstream ECU Flash Reprogramming
Procedure, and flash the skid control ECU with the NEW calibration file update.
6. Is the vehicle a 2016 – 2018 model year RX 450h or a 2018 model year RX 450hL?
YES — Continue to step 7.
NO — Go to step 8.
7. Replace the master cylinder reservoir assembly.
Refer to TIS, applicable model and model year Repair Manual:
2016 RX 450h:
Brake – Brake Control/Dynamic Control System – “Brake Control / Dynamic Control Systems:
Brake Actuator: Removal / Installation”
2017 – 2018 RX 450h and 2018 RX 450hL:
Brake – Brake Control/Dynamic Control System – “Brake Control / Dynamic Control Systems:
Brake Actuator: Removal / Installation”
8. For ALL model years, replace the brake actuator assembly using the following modified
procedure. Refer to the applicable Repair Manual when directed.
NOTE
The necessary procedures (adjustment, calibration, initialization, or registration) that MUST be
performed AFTER parts are removed, installed, or replaced during brake actuator assembly
removal/installation are shown in the applicable Repair Manual.
CAUTION
While the auxiliary battery is connected, even if the power switch is OFF, the brake
control system activates when the brake pedal is depressed, or ANY door courtesy switch is
turned ON. Therefore, when servicing brake system components, do NOT depress the brake
pedal or open/close the doors while the auxiliary battery is connected.
© 2023 Lexus, a division of Toyota Motor Sales, USA
L-SB-0032-23
Rev1
May 15, 2023
Page 8 of 30
Brake Squawk/Knock Noise
Repair Procedure (continued)
9. Remove the brake actuator assembly using the following modified procedure.
A. With the ignition switch in the IG-OFF
position, disconnect the two brake booster
pump connectors and cover the ends of the
connectors using tape.
Figure 1.
1
CAUTION
Using GTS+ to perform accumulator
pressure zero down causes the
pressurized brake fluid in the
accumulator to be returned to
the brake master cylinder
reservoir assembly.
Taping the connectors will prevent
fluid from contaminating
the connectors.
Figure 2.
- 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-0032-23 Rev
Replacement Service Bulletin Number:
MFR Communication Date: 2023-10-02
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE AND ENGINE COOLING
MFR Component System:
MFR Component Subsystem:
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