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:
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Outback
1. Remove the mounting screws using a Phillips screwdriver.
2. Remove the lens.
3. Pull the bulb out of the socket.
4. Install a new bulb.
5. Reinstall the lens.
6. Tighten the mounting screw ...