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BC Air Brake Practice · Question

A continuously illuminated yellow ABS indicator lamp on a commercial trailer after starting indicates:

A continuously illuminated yellow ABS indicator lamp on a trailer, after the initial self-test, signals a fault or malfunction within the trailer's ABS system t

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Question: A continuously illuminated yellow ABS indicator lamp on a commercial trailer after starting indicates:

Answer options:

  • The trailer ABS system is functioning correctly. ✅ A malfunction in the trailer's ABS system.
  • The trailer is not connected to the tractor's ABS power supply.
  • The trailer's parking brakes are applied.

Correct answer: A malfunction in the trailer's ABS system.

Explanation: A continuously illuminated yellow ABS indicator lamp on a trailer, after the initial self-test, signals a fault or malfunction within the trailer's ABS system that requires attention, according to Canadian air brake handbooks.

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