Brake System Warning Light
This warning has the following functions:
Warning light inspection
For an operation check, make sure that the light turns on when the vehicle power is switched on, and turns off a few seconds later or when the engine is started.
When the light turns on
The light turns on continuously if any one of the following occurs:
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Insufficient brake fluid
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Brake system (electronic brake force distribution system) has a problem
Park the vehicle in a safe place immediately and contact an Authorized Mazda Dealer.
Do not drive with the brake system warning light illuminated. Contact an Authorized Mazda Dealer to have the brakes inspected as soon as possible.
Driving with the brake system warning light illuminated is dangerous. It indicates that your brakes may not work at all or that they could completely fail at any time. If this light remains illuminated, after checking that the parking brake is fully released, have the brakes inspected immediately.
If the brake system warning light and the ABS warning light 
turn on at the same time, stop the vehicle in a safe place immediately and contact an Authorized Mazda Dealer.
The rear wheels could lock more quickly in an emergency stop than under normal circumstances which could result in an accident.
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In addition, the effectiveness of the braking may diminish so you may need to depress the brake pedal more strongly than normal to stop the vehicle.
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The brake warning light may turn on when the engine is started. In this case, park the vehicle in a safe location and release the brake pedal. If the brake warning light remains illuminated, have the vehicle inspected by an Authorized Mazda Dealer.
