Ontario Air Brake Practice · Question
You see a red light illuminated on your 'trailer air supply' push/pull valve. What does this signify?
A red light on the 'trailer air supply' valve (red octagonal button) indicates a loss of air pressure in the trailer air supply line, which typically results in
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Question: You see a red light illuminated on your 'trailer air supply' push/pull valve. What does this signify?
Answer options:
- The trailer's parking brakes are applied. ✅ There is a loss of air pressure to the trailer.
- The emergency brake on the tractor is engaged.
- The trailer's primary air tank is full.
Correct answer: There is a loss of air pressure to the trailer.
Explanation: A red light on the 'trailer air supply' valve (red octagonal button) indicates a loss of air pressure in the trailer air supply line, which typically results in the trailer's spring brakes applying. This is a critical warning to address immediately.
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