{"nhtsa_id":10030307,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2009-09-21","date":"2009-05-15","document_id":"SB-326C","mfr_campaign":null,"replaces":null,"component":"SERVICE BRAKES, AIR:SUPPLY:QUICK RELEASE VALVE; SERVICE BRAKES, AIR:SUPPLY:CHECK VALVE","mfr_system":null,"summary":"MOTORCOACH INC: ATC/ESC RELAY VALVE ASSEMBLY. THE DEFECT INVOLVES A VALVE THAT IS PART OF THE AUTOMATIC TRACTION CONTROL (ATC) AND ELECTRONIC STABILITY CONTROL (ESC) SYSTEMS FOR THE COACH'S REAR AXLES, AND THE ESC FOR THE FRONT AXLES. *PE","document":null,"url":"https://open.wenmarpro.com/bulletins/10030307","components":[{"id":"brakes","name":"Brakes","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"MCI","model":"J4500","year_from":2000,"year_to":2009,"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":[]}