The trailer's ABS malfunction lamp stays on after starting the vehicle. What does this tell you?
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Correct!
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Correct answer to question 10 (Combination Vehicles): The trailer's ABS is not functioning, though the regular brakes still work
Why
An ABS malfunction lamp indicates only the antilock system has a fault; the trailer's normal service brakes still apply and hold, but wheel-lockup protection is lost.
Updated: November 2026
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