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Correct!

What system is used to control a vehicle's speed without using the footbrake?

A secondary brake
An endurance brake (retarder)
Correct answer
A differential lock
An emergency air system

DVSA theory test explanation

Large vehicles can be fitted with various types of endurance brake (retarder). Make sure you're familiar with how the system operates on the vehicle you're using. Don't risk a crash or collision through ignorance.

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