Question 45 of 140

You notice a brake seems out of adjustment during a pre-trip check. Why shouldn't you try to adjust it yourself unless qualified?

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Improper adjustment can leave the brake working incorrectly in a way that isn't obvious, so it should be handled by someone trained to do it correctly
Adjusting brakes yourself is always faster and just as safe as a qualified technician's work, since the process is the same either way
Only a locksmith is legally allowed to adjust brakes
It's only a paperwork issue, not a mechanical one

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Correct answer to question 45 (Air Brakes): Improper adjustment can leave the brake working incorrectly in a way that isn't obvious, so it should be handled by someone trained to do it correctly

Why

A brake adjusted incorrectly can look fine but still apply with less force than it should, which is a hidden risk best avoided by having someone trained do the adjustment rather than guessing at it.

Updated: November 2026

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You notice a brake seems out of adjustment during a pre-trip check. Why shouldn't you try to adjust it yourself unless qualified?

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