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Brake Fluid Level Sensor Inspection

WARNING: This page is about a different car, the 2018 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  2. Remove the battery. (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 2.5 (VIN M)] .) (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 2.5 (VIN 5)] .) (See BATTERY REMOVAL/INSTALLATION (VIN Y) .)
  3. Disconnect the brake fluid level sensor connector. (See MASTER CYLINDER REMOVAL/INSTALLATION .)
  4. Inspect for continuity according to fluid level between the brake fluid level sensor terminals.
    Fig 1: Inspecting Continuity Between Brake Fluid Level Sensor Terminals
    G09785816Courtesy of MAZDA MOTORS CORP.
    Fig 2: Brake Fluid Level Sensor Terminals Continuity Chart
    G12234368Courtesy of MAZDA MOTORS CORP.