1. Disconnect the brake fluid level sensor connector from the master cylinder.
2. 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..

Brake Switch InspectionAdd-On Non-Genuine Parts and Accessories
Non-genuine parts and accessories for Mazda vehicles can be found in stores.
These may fit your vehicle, but they are not approved by Mazda for use with Mazda
vehicles. When you install non-genuine parts or accessories, they could affect your
vehicle's performance or safety systems; the Maz ...
Generator Disassembly/Assembly [Skyactiv G 2.0]
CAUTION:
Melt the solder quickly, otherwise the diodes (rectifier) and regulator will
be damaged by excessive heat.
1. Disassemble in the order indicated in the table.
2. Assemble in the reverse order of disassembly.
1
Rotor component
...
Rear Door Latch And Lock Actuator Inspection
The following actuator and switch are integrated with the rear door latch
and lock actuator.
From the actuator/switch name and operation in the following table, select
the actuator or switch to be inspected, and perform the inspection following
the inspection procedure des ...