Question 65 of 140

What is the trailer hand valve actually intended for, as opposed to being used to control a skid?

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Stopping the vehicle in the shortest possible distance in an emergency, faster than the foot pedal
Slowing the combination gradually in normal traffic
Replacing the foot brake pedal during long descents
Testing that the trailer brakes hold, such as during a pre-trip brake check

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Correct answer to question 65 (Combination Vehicles): Testing that the trailer brakes hold, such as during a pre-trip brake check

Why

The hand valve's intended role is testing the trailer brakes on their own, such as during a pre-trip check, not steering out of everyday driving situations or trying to manage a skid.

Updated: November 2026

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What is the trailer hand valve actually intended for, as opposed to being used to control a skid?

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