Ontario Air Brake Practice · Question
What is the function of the tractor protection valve in a commercial vehicle towing an air-braked trailer?
The tractor protection valve acts as a safety device to seal off the tractor's air system if a major air leak or separation occurs in the trailer's air lines, p
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Question: What is the function of the tractor protection valve in a commercial vehicle towing an air-braked trailer?
Answer options: ✅ To prevent loss of air pressure from the tractor in case of a trailer air system failure.
- To automatically apply the trailer brakes when coupling.
- To regulate the pressure to the tractor's service brakes.
- To release air pressure quickly from the trailer lines.
Correct answer: To prevent loss of air pressure from the tractor in case of a trailer air system failure.
Explanation: The tractor protection valve acts as a safety device to seal off the tractor's air system if a major air leak or separation occurs in the trailer's air lines, preventing the tractor from losing all its air pressure.
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