Brake Fluid Level Sensor Inspection

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the negative battery cable
Disconnect the sensor connector.
Inspect for continuity between terminals of fluid level sensor
- If not as specified, replace the fluid level sensor
  
  Fig 1: Fluid Level Sensor Terminals Continuity Chart
  Courtesy of MAZDA MOTORS CORP.
  
  Fig 2: Identifying Fluid Level Sensor Terminals
  Courtesy of MAZDA MOTORS CORP.