{"source":"nhtsa","country":"us","campaign":"21V953000","date":"2021-12-09","owner_notified":"2022-02-08","manufacturer":"Mack Trucks, Inc.","component":"PARKING BRAKE","summary":"Mack Trucks, Inc. (Mack) is recalling certain 2008-2019 TerraPro (MRU) and 2019-2022 TerraPro (TE) vehicles.  A brake control valve air leak into the attached exhaust hose can create excessive back pressure, causing the parking brake to release unexpectedly.","consequence":"The unexpected release of the parking brake may allow the vehicle to rollaway, increasing the risk of a crash.","remedy":"Dealers will remove the exhaust tube and fitting from the valve, free of charge.  Owner notification letters were mailed February 8, 2022. Owners may contact Mack customer service at 1-800-866-1177.  Mack's number for this recall is SC0433.","notes":"Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.nhtsa.gov.","mfr_campaign":"SC0433","part_number":"25117989","units":20668,"completion":{"kind":"annual","report_number":2,"period_from":"2025-1","period_to":"2025-4","submitted":"2026-01-05","involved":20668,"remedied":12652,"unreachable":0,"removed":0,"remedied_percent":61,"as_of":"2026-10-19"},"do_not_drive":false,"park_outside":false,"notification":null,"french":null,"vehicles":[{"year":2008,"make":"MACK","model":"MRU","vehicle_id":null,"match":null,"built_from":null,"built_to":null},{"year":2009,"make":"MACK","model":"MRU","vehicle_id":null,"match":null,"built_from":null,"built_to":null},{"year":2010,"make":"MACK","model":"MRU","vehicle_id":null,"match":null,"built_from":null,"built_to":null},{"year":2019,"make":"MACK","model":"TE","vehicle_id":null,"match":null,"built_from":null,"built_to":null},{"year":2020,"make":"MACK","model":"TE","vehicle_id":null,"match":null,"built_from":null,"built_to":null},{"year":2021,"make":"MACK","model":"TE","vehicle_id":null,"match":null,"built_from":null,"built_to":null},{"year":2011,"make":"MACK","model":"TERRAPRO (MRU)","vehicle_id":null,"match":null,"built_from":null,"built_to":null},{"year":2012,"make":"MACK","model":"TERRAPRO (MRU)","vehicle_id":null,"match":null,"built_from":null,"built_to":null},{"year":2013,"make":"MACK","model":"TERRAPRO (MRU)","vehicle_id":null,"match":null,"built_from":null,"built_to":null},{"year":2014,"make":"MACK","model":"TERRAPRO (MRU)","vehicle_id":null,"match":null,"built_from":null,"built_to":null},{"year":2015,"make":"MACK","model":"TERRAPRO (MRU)","vehicle_id":null,"match":null,"built_from":null,"built_to":null},{"year":2016,"make":"MACK","model":"TERRAPRO (MRU)","vehicle_id":null,"match":null,"built_from":null,"built_to":null},{"year":2017,"make":"MACK","model":"TERRAPRO (MRU)","vehicle_id":"2017_mack_terrapro","match":"base","built_from":null,"built_to":null},{"year":2018,"make":"MACK","model":"TERRAPRO (MRU)","vehicle_id":"2018_mack_terrapro","match":"base","built_from":null,"built_to":null},{"year":2019,"make":"MACK","model":"TERRAPRO (MRU)","vehicle_id":"2019_mack_terrapro","match":"base","built_from":null,"built_to":null},{"year":2022,"make":"MACK","model":"TERRAPRO (TE)","vehicle_id":"2022_mack_terrapro","match":"base","built_from":null,"built_to":null}],"may_apply":true,"as_of":"2026-10-19","lookup":{"nhtsa":"https://www.nhtsa.gov/recalls","tc":"https://wwwapps.tc.gc.ca/Saf-Sec-Sur/7/VRDB-BDRV/search-recherche/menu.aspx?lang=eng","maker":null},"attribution":[],"url":"https://open.wenmarpro.com/recalls/nhtsa/21V953000"}