Correct answer
The brake booster.
The brake booster or servo. It assists braking pressure generation with less driver effort, using technologies such as vacuum or electromechanical operation. It differs from ABS pressure regulation to prevent wheel locking and from a direction indicator. Assistance alone does not guarantee minimum stopping distance. If it fails, follow manufacturer guidance and seek assistance; behaviour depends on the system.
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The direction indicator.
The brake booster.
The windscreen wiper.
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