Two separate circuits
Your vehicle has a dual circuit brake system. Each circuit works diagonally across the vehicle. If one circuit of the brake system should fail, the other half of the system still works. If one circuit fails, the brake pedal will go down much closer to the floor than usual and you will need to press it down much harder. And a much longer distance will be needed to stop the vehicle.
See also:
Tire chains
Tire chains cannot be used on your Impreza, WRX and STI because of the lack of clearance between the tires and vehicle body. ...
Operation
If the driver and/or front passenger have/ has not yet fastened the seatbelt(s)
when the ignition switch is turned to the “ON” position, the seatbelt warning light(s)
will flash for 6 seconds, to ...
Tripped sensor identification
The security indicator light flashes when the alarm system has been triggered.
Also, the number of flashes indicates the location of unauthorized intrusion or
the severity of impact on the vehicle ...