{"nhtsa_id":10203755,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2021-12-02","date":"2021-11-23","document_id":"SS3083-FTL2021","mfr_campaign":null,"replaces":null,"component":"SUSPENSION","mfr_system":null,"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.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10203755-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10203755-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10203755","components":[{"id":"suspension","name":"Suspension","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"FREIGHTLINER","model":"CASCADIA","year_from":2017,"year_to":2022,"match":"exact","vehicle_ids":["2017_freightliner_cascadia","2018_freightliner_cascadia","2019_freightliner_cascadia","2020_freightliner_cascadia","2021_freightliner_cascadia","2022_freightliner_cascadia"]},{"make":"WESTERN STAR","model":"49X","year_from":2021,"year_to":2022,"match":null,"vehicle_ids":[]}],"as_of":"2026-10-19","note":"A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.","attribution":[]}