Freightliner Cascadia 2017–2022 — technical service bulletin
Bulletin CALFTL42-004 · NHTSA communication 10194477 · issued May 12, 2021
Technical service bulletin
communication type
Equipment
component
2017–2022
model years
6
vehicle entries
Official summary
Customer Advisory Letter for Drive Axle Drum Brake S-Cam U-Bolt Replacement.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.