{"nhtsa_id":46404,"type":"service_bulletin","type_name":"Service bulletin","date_added":"1996-04-25","date":"1995-11-01","document_id":"GRP4/9506","mfr_campaign":null,"replaces":null,"component":"SERVICE BRAKES, HYDRAULIC:POWER ASSIST:VACUUM","mfr_system":null,"summary":"EXCESSIVE OPERATING NOISE FROM THE HYDRAULIC BRAKE BOOSTER PUMP. TO REDUCE THE OPERATING NOISE FROM THE HYDRAULIC BRAKE BOOSTER PUMP, A DAMPER (ARROW, FIGURE 1) CAN BE INSTALLED BETWEEN THE PUMP AND THE BRAKE SYSTEM ACCUMULATOR.","document":null,"url":"https://open.wenmarpro.com/bulletins/46404","components":[{"id":"brakes","name":"Brakes","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"PORSCHE","model":"911","year_from":1996,"year_to":1996,"match":"exact","vehicle_ids":["1996_porsche_911"]},{"make":"PORSCHE","model":"CARRERA","year_from":1996,"year_to":1996,"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":[]}