Virginia CDL Double/Triple Trailers Practice Test

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A driver finds the rear trailer shut-off valves closed correctly but no air at the rear trailer service line during a brake check. What is likely?

An upstream valve, hose, or connection may be closed, crossed, leaking, or blocked The final closed valves prove the system is fully charged The electrical cord supplies service air The T endorsement test does not cover air checks

Correct Answer:

An upstream valve, hose, or connection may be closed, crossed, leaking, or blocked

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