TSB: Some 2012 ? 2014 model year Prius C hybrid vehicles may exhibit a condition in which the brake,
ABS, and/or TRAC warning lights are on and/or a Check VSC message displays. Diagnostic
Trouble Codes (DTCs) C1391, C1252, C1256, and/or C1253 may also 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.
