{"nhtsa_id":10171844,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2020-02-29","date":"2020-02-20","document_id":"04-003-20-3668","mfr_campaign":null,"replaces":null,"component":"SERVICE BRAKES, HYDRAULIC","mfr_system":null,"summary":"Some vehicles may exhibit grooves (1) in rear brake disc plate(s), as shown below. This concern is mostly found on new or low mileage vehicles, when the brakes are new. The grooves may be caused through abrasion from the accumulation of metal particles from the rear brake disc plates. The metal particles get caught between the brake pads and disc plates causing groove damage. To eliminate this concern, the disc plate surface honing process has been changed to reduce metal particle formation.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2020/MC-10171844-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2020/MC-10171844-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10171844","components":[{"id":"brakes","name":"Brakes","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"MAZDA","model":"CX-5","year_from":2016,"year_to":2020,"match":"exact","vehicle_ids":["2016_mazda_cx-5","2017_mazda_cx-5","2018_mazda_cx-5","2019_mazda_cx-5","2020_mazda_cx-5"]},{"make":"MAZDA","model":"CX-9","year_from":2016,"year_to":2020,"match":"exact","vehicle_ids":["2016_mazda_cx-9","2017_mazda_cx-9","2018_mazda_cx-9","2019_mazda_cx-9","2020_mazda_cx-9"]}],"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":[]}