The bulletin aims to correct a knock-clunk noise issue from the rear brakes of 2018-2021 model year LS 500 and LS 500h vehicles when applying the brakes while driving forward and/or in reverse.
Repair Procedure
The procedure consists of three steps: confirming the condition exists, installing updated brake kits, and performing a test-drive to confirm the issue is resolved.
Step 1: Confirm the Condition
The mechanic should listen for the knock-clunk noise when applying the brakes while driving forward and/or in reverse. If the noise is present, proceed to Step 2. If not, the bulletin does not apply, and the mechanic should continue diagnosis using the applicable Repair Manual.
Step 2: Install Updated Brake Kits
The mechanic should remove the rear brake pad kits and install the new kits. Refer to the Repair Manual for specific instructions for the applicable model and year.
Step 3: Test-Drive the Vehicle
The mechanic should test-drive the vehicle to confirm the condition is no longer present.
Manual:
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