{"nhtsa_id":606590,"type":"service_bulletin","type_name":"Service bulletin","date_added":"1999-08-30","date":"1999-05-28","document_id":"PI527","mfr_campaign":null,"replaces":null,"component":"SERVICE BRAKES, AIR:SUPPLY:HOSES, LINES/PIPING, AND FITTINGS","mfr_system":null,"summary":"SUBJECT REGARDING SIGNAL LINE PIPING TO THE R12 DC REAR AXLE SERVICE BRAKE RELAY VALVE. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/606590","components":[{"id":"brakes","name":"Brakes","parent":null},{"id":"brake-hose-line","name":"Brake hoses and lines","parent":"brakes"}],"codes":[],"topics":[],"vehicles":[{"make":"MACK","model":"CH","year_from":null,"year_to":null,"match":"exact","vehicle_ids":[]},{"make":"MACK","model":"CL","year_from":null,"year_to":null,"match":"exact","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":[]}