Air Brake (Q Endorsement) Practice · Question
On a tractor protection valve, the purpose is to:
If trailer air pressure drops sharply, the tractor protection valve closes to preserve tractor air supply for tractor brakes and steering.
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Question: On a tractor protection valve, the purpose is to:
Answer options: ✅ Protect the tractor's air system if a trailer breakaway or major line leak occurs
- Protect the engine
- Protect the cab
- Boost trailer braking
Correct answer: Protect the tractor's air system if a trailer breakaway or major line leak occurs
Explanation: If trailer air pressure drops sharply, the tractor protection valve closes to preserve tractor air supply for tractor brakes and steering.
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