See also:

Brake booster
If the brake booster does not operate as described in the following, have it checked by your SUBARU dealer. 1. With the engine off, depress the brake pedal several times, applying the same pedal forc ...

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 ...

Before checking or servicing in the engine compartment
WARNING ● Always stop the engine and apply the parking brake to prevent the vehicle from moving. ● Always let the engine cool down. Engine parts become very hot when the engine is ru ...