{"nhtsa_id":39029,"type":"service_bulletin","type_name":"Service bulletin","date_added":"1995-03-01","date":"1994-12-01","document_id":"102","mfr_campaign":null,"replaces":null,"component":"SERVICE BRAKES, AIR","mfr_system":null,"summary":"AD-9 AIR DRYER - THE HEATER ELEMENT IN THE DRYER'S PURGE VALVE ASSEMBLY CAN FAIL LEADING TO AIR LINE FREEZE-UP. *TW","document":null,"url":"https://open.wenmarpro.com/bulletins/39029","components":[{"id":"brakes","name":"Brakes","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"TRANSPORTATION","model":"TRANSPORTATION","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":[]}