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 InspectionBlower Motor Removal [Full Auto Air Conditioner]
NOTE:
The blower motor is located on the A/C unit as shown in the figure.
Perform the work from the front passenger side in the posture shown in the
figure.
1. Set the air intake mode to FRESH.
2. Disconnect the negative battery cable.
3. Remove the following ...
Checking Tire Pressure
When you check the air pressure, make sure the tires are cold —meaning
they are not hot
from driving even a mile.
Remove the cap from the valve on one tire.
Firmly press a tire gauge onto the valve.
Add air to achieve recommended air pressure.
If you overfill the tire, release air by ...
Push-Starting
Do not push-start your Mazda.
WARNING
Never tow a vehicle to start it:
Towing a vehicle to start it is
dangerous. The vehicle being towed
could surge forward when its engine
starts, causing the two vehicles to
collide. The occupants could be injured.
CAUTION
...