Mazda 6 Owner's Manual page 174

When Driving
Start/Stop Engine
Do not rely completely on the vehicle roll prevention function.
The vehicle roll prevention function is a supplementary function which operates
for a maximum of four seconds after releasing the brake pedal and accelerating the
vehicle from an engine idling stop condition. Over reliance on the system may result
in an unexpected accident if the vehicle were to suddenly accelerate. Before starting
to drive the vehicle, always con rm the safety of the surroundings and operate the
selector lever, brake pedal, and accelerator pedal appropriately. Note that the vehicle
may move suddenly depending on the vehicle's load or if it is towing something.
Note that the vehicle may move suddenly after the vehicle roll prevention function is
released while the vehicle is under the following conditions:
The selector lever is in the N position.
If the selector lever is shifted to the N position and the brake pedal is released
while the i-stop function is operating, the brake force is gradually released. To
accelerate the vehicle, release the brake pedal after the engine restarts and shift
the selector lever to a position other than the N position.
NOTE
When the vehicle is stopped on a steep grade, the vehicle roll prevention function does
not operate because engine idling is not stopped.
The brake pedal response may change, sound may occur from the brakes, or the
brake pedal could vibrate from the operation of the vehicle roll prevention function.
However, this does not indicate a malfunction.
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WARNING