Two separate circuits
Your vehicle has two separate circuit brake systems. 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:
Function settings
A SUBARU dealer can change the settings of the functions shown in the following
table to meet your personal requirements. Contact the nearest SUBARU dealer for
details.
...
Fuel
Use of a fuel which is low in quality or use of an inappropriate fuel additive may cause engine damage. ...
3.6 L models
1) Power steering fluid reservoir (page 11-27)
2) Differential gear oil level gauge (page 11-26)
3) Automatic transmission fluid level gauge (page 11-24)
4) Brake fluid reservoir (page 11-28)
5) ...