Brake Fluid Level Sensor Inspection

Disconnect the brake fluid level sensor connector from the master cylinder.
Inspect for continuity according to fluid level between the brake fluid level sensor terminals.
- If not as indicated in the table, replace the reserve tank. (See MASTER CYLINDER REMOVAL/INSTALLATION .)
  
  Fig 1: Identifying Brake Fluid Level Sensor Connector Terminal
  Courtesy of MAZDA MOTORS CORP.
  
  Fig 2: Brake Fluid Level Sensor Continuity Reference Chart
  Courtesy of MAZDA MOTORS CORP.