See also:

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. ...

Power door locking switches
1) Lock 2) Unlock All doors and the rear gate (Outback) can be locked and unlocked by the power door locking switches located at the driver’s side and the front passenger’s side doors. To lock ...

Lubrication oil circulation in the refrigerant circuit
Operate the air conditioner compressor at a low engine speed (at idle or low driving speeds) a few minutes each month during the off-season to circulate its oil. ...