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:
Modification of your vehicle
CAUTION
Your vehicle should not be modified other than with genuine SUBARU parts and
accessories. Other types of modifications could affect its performance, safety or
durability, and may even vio ...
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Turbo models
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