{"nhtsa_id":10082801,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2016-10-18","date":"2014-12-11","document_id":"FSB 593-014","mfr_campaign":null,"replaces":null,"component":"SERVICE BRAKES","mfr_system":null,"summary":"GRADE GRIPPER QUICK RELEASE VALVE, REPLACEMENT. ON SOME MACK CHU, CXU, AND GU TRUCKS BUILT BETWEEN 04/31/2008 AND 01/05/2015, AND EQUIPPED WITH THE GRADE GRIPPER FUNCTION MAY EXPERIENCE A SLOW RELEASE OF THE TRAILER’S SERVICE BRAKES. ADDITIONALLY, A DELAY IN THE RELEASE OF THE GRADE GRIPPER FUNCTION MAY BE CAUSED BY CERTAIN TRUCK OPTIONS AND TRAILER COMBINATIONS USED BY THE OPERATOR.","document":null,"url":"https://open.wenmarpro.com/bulletins/10082801","components":[{"id":"brakes","name":"Brakes","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"MACK","model":"CHU","year_from":2009,"year_to":2016,"match":null,"vehicle_ids":[]},{"make":"MACK","model":"CXU","year_from":2009,"year_to":2016,"match":null,"vehicle_ids":[]},{"make":"MACK","model":"GU","year_from":2009,"year_to":2016,"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":[]}