Freightliner Cascadia 2017–2022 — technical service bulletin
Bulletin SS3083-FTL2021 · NHTSA communication 10203755 · issued Nov 23, 2021
Technical service bulletin
communication type
Suspension
component
2017–2022
model years
8
vehicle entries
Official summary
Service Solution for Aero Height Control Interfering with RDF Alignment. The Aerodynamic Height Control feature on the New Cascadia is a feature that raises and lowers the air suspension with relation to vehicle speed in order to reduce drag and achieve better fuel efficiency. The Hadley Smart Valve (HSV) is the module that makes this possible by applying and exhausting air from the rear axle suspension as necessary.
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.