{"nhtsa_id":10186941,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2021-02-10","date":"2021-01-27","document_id":"SD-08-12046","mfr_campaign":null,"replaces":null,"component":"SERVICE BRAKES","mfr_system":null,"summary":"The function of the Bendix® AD-HF® (High Flow) PuraGuard® oil coalescing air dryer and the AD-HF®i (High Flow Intelligent) air dryer is to collect and remove air system contaminants in solid, liquid, and aerosol form before they enter the brake system. As a module, they provide heavy vehicles with an integrated vehicle air dryer, purge reservoir, governor, and a number of the charging valve components in a complete assembly. These components have been designed as an integrated air supply system.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10186941-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10186941-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10186941","components":[{"id":"brakes","name":"Brakes","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"BENDIX","model":"AD-2 AIR DRYER","year_from":null,"year_to":null,"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":[]}