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Incorrect!

What's the most powerful brake on a bus?

Secondary brake
You selected this answer
Anti-lock braking system
Endurance brake (retarder)
Service brake
Correct answer

DVSA theory test explanation

The most powerful and effective brake on the vehicle is the service brake, and this should be used in normal circumstances. Well-maintained brakes should apply an even pressure to all the wheels, providing an efficient, controlled stop.

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