Question 45 of 140

Your tractor's ABS is working normally, but the trailer's ABS malfunction lamp is lit. How should this change your driving?

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Switch to using only the trailer hand valve until the lamp goes out
Avoid using the brakes at all until the trailer is repaired
Brake a little earlier and more gently than usual, since the trailer's wheels could lock up under hard braking
No change is needed, since the tractor's ABS system automatically covers braking for the whole combination

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Correct answer to question 45 (Combination Vehicles): Brake a little earlier and more gently than usual, since the trailer's wheels could lock up under hard braking

Why

The tractor's ABS only protects the tractor's own wheels, so a trailer with a malfunctioning ABS can still lock its wheels under hard braking, calling for earlier and gentler braking to compensate.

Updated: November 2026

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Your tractor's ABS is working normally, but the trailer's ABS malfunction lamp is lit. How should this change your driving?

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