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BDifficulty 2/5

In a car with a conventional vacuum brake booster, the engine is stopped, the stored vacuum has been exhausted and no auxiliary assistance is available. What happens when pressing the brake pedal?

Correct answer

That more pressure will need to be applied to the brake pedal if we want to brake.

More pedal force is needed for comparable braking because booster assistance is unavailable. Stored vacuum may temporarily preserve assistance after the engine is stopped; it is not necessarily lost immediately. Other electric or hydraulic systems may work differently. Do not turn off the engine while driving to test this.

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  • That more pressure will need to be applied to the brake pedal if we want to brake.

  • That the wheels will lock.

  • That the handbrake will need to be pulled up more tightly.

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