What is the order of emergency braking, of a combination vehicle consisting of a tractor and a trailer equipped with a pneumatic braking system?

Explanation

Correct answer: The trailer will start braking first.

In pneumatic braking systems of vehicle combinations, to ensure stability, braking begins with the trailer. This prevents the jack-knifing phenomenon, which could occur if the braking tractor unit were pushed by the not-yet-braking trailer. Such a design of the braking system keeps the entire vehicle combination in a straight line during braking, which is crucial for safety.

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