{"nhtsa_id":11014494,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2025-02-25","date":"2014-05-01","document_id":"870 Brake Chamber/763-2","mfr_campaign":null,"replaces":null,"component":"SERVICE BRAKES","mfr_system":null,"summary":"This bulletin has been issued to inform customers of the availability of an actuator by-pass breather kit for Wabco Spring Brake Chambers. Part Numbers 441331 & 440675. These chambers were used on chassis number 1829 onwards and also buses originally fitted with MGM actuators but converted as per Service Bulletin 763-2.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2014/MC-11014494-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2014/MC-11014494-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11014494","components":[{"id":"brakes","name":"Brakes","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"ALEXANDER DENNIS","model":"ENVIRO 500","year_from":2009,"year_to":2014,"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":[]}