Question 139 of 140

Why should a driver avoid slamming on the brakes if the trailer suddenly starts to separate slightly from the tractor at a stoplight or low speed?

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Coupling issues at low speed present no real risk
It has no bearing on the coupling's condition either way
Hard braking always fully re-secures a loose coupling no matter how far it has separated
A sudden hard brake could worsen an already compromised connection between the units

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Correct answer to question 139 (Combination Vehicles): A sudden hard brake could worsen an already compromised connection between the units

Why

If a coupling problem is developing, a sudden hard brake could add stress that worsens the separation rather than helping, so a controlled, gentle stop to inspect is the safer approach.

Updated: November 2026

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Why should a driver avoid slamming on the brakes if the trailer suddenly starts to separate slightly from the tractor at a stoplight or low speed?

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