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Why should leakage be rechecked after hooking to a trailer that was not part of the tractor's earlier test?
- A.Trailers never leak, so the check is a formality
- B.The tractor limits still apply unchanged
- C.Only the trailer lights need checking
- D.The trailer adds its own tanks, valves, and connections, and the combination must meet the combination limits as a unit
Correct answer
D. The trailer adds its own tanks, valves, and connections, and the combination must meet the combination limits as a unit
Why
A trailer that sat for days can bring a flat tank, a cracked hose, or a leaking chamber into the combination. Testing the coupled unit is the only way to know the whole system holds air.
Manual topic: Air Brakes - Air Leakage and Brake Tests · From the Air Brakes practice bank (AB-092).