Subaru Forester: 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.
Brake system
...Brake booster
The brake booster uses engine manifold vacuum to assist braking force. Do not turn off the engine while driving because that will turn off the brake booster, resulting in poor braking power. ...See also:
Underfloor Bins (if equipped)
Pull up the straps (A) to open the bin.
CAUTION: Do not allow items in the bins to extend above the top of the bin.
Otherwise, the bin or luggage floor may be damaged. ...
Engine Oil and Filter
Specified Oil
(1) Preferred
Use engine oil with the American Petroleum Institute Certified For Gasoline Engines
“Starburst” symbol. Select the appropriate oil viscosity according to the above ...