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:
Fuel
CAUTION
Use of a fuel which is low in quality or use of an inappropriate fuel additive
may cause engine damage. ...
Recommended grade and viscosity
Each oil manufacturer has its own base oils and additives. Never use different brands together. For details, refer to “Manual transmission, front differential and rear differential gear oil”. ...
Parking brake lining
The break-in maintenance for the parking brake linings should be performed at
a SUBARU dealer. ...