Ontario Air Brake Practice · Question
Before disconnecting a trailer, the spring brakes on the trailer must be:
Apply trailer spring brakes (park valve in) before disconnecting glad-hands to prevent rollaway.
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Question: Before disconnecting a trailer, the spring brakes on the trailer must be:
Answer options:
- Released ✅ Applied (park valve in)
- Removed
- Disabled
Correct answer: Applied (park valve in)
Explanation: Apply trailer spring brakes (park valve in) before disconnecting glad-hands to prevent rollaway.
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