{"nhtsa_id":620212,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2001-07-20","date":"2001-05-01","document_id":"14894","mfr_campaign":null,"replaces":null,"component":"SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS","mfr_system":null,"summary":"SOME VEHICLES MAY EXHIBIT A REPETITIVE THUMP / KNOCK NOISE FROM THE REAR WHICH IS PROPORTIONAL TO WHEEL SPEED WHEN BRAKE. THIS MAY BE CAUSED BY THE INITIAL FINISH / SPIRAL CUT OF THE REAR BREAK ROTOR(S). *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/620212","components":[{"id":"brakes","name":"Brakes","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"FORD","model":"EXPLORER","year_from":2002,"year_to":2002,"match":"exact","vehicle_ids":["2002_ford_explorer"]},{"make":"MERCURY","model":"MOUNTAINEER","year_from":2002,"year_to":2002,"match":"exact","vehicle_ids":["2002_mercury_mountaineer"]}],"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":[]}