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.
The brakes will continue to work even when the brake booster completely stops functioning. If this happens, however, you will have to depress the pedal much harder than normal and the braking distance will increase.
See also:
The Inside
The interior is quiet enough at idle that one time I didn't even realize it
was running. That's when I recognized Subaru finally seems to have licked this
engine's chronic idle vibration. In this ...
Sun visors
To block out glare, swing down the visors. To use the sun visor at a side window,
swing it down and move it sideways. ...
For CVT models
This light illuminates when All-Wheel Drive is disengaged and the drive mechanism
is switched to Front Wheel Drive for maintenance or similar purposes. This light
flashes if the vehicle is driven ...