{"nhtsa_id":10179790,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2020-09-14","date":"2020-08-31","document_id":"L-SB-0033-20","mfr_campaign":null,"replaces":null,"component":"SERVICE BRAKES; ELECTRICAL SYSTEM","mfr_system":null,"summary":"TSB: Some 2010 ? 2012 model year RX 450H vehicles may exhibit a condition where the brake, ABS, and/or TRAC warning light(s) are on and/or a Check VSC message displays. Diagnostic Trouble Codes (DTCs) C1391, C1252, C1256, or C1253 may be stored. This condition may be caused by a small internal brake fluid leak inside the brake booster assembly with master cylinder. Follow the Repair Procedure in this bulletin to address this condition.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2020/MC-10179790-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2020/MC-10179790-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10179790","components":[{"id":"brakes","name":"Brakes","parent":null},{"id":"electrical","name":"Electrical system","parent":null}],"codes":["C1252","C1253","C1256","C1391"],"topics":[],"vehicles":[{"make":"LEXUS","model":"RX HYBRID","year_from":2011,"year_to":2012,"match":null,"vehicle_ids":[]},{"make":"LEXUS","model":"RX450H","year_from":2010,"year_to":2010,"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":[]}