Practice question

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?

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

Answer: A — An upstream valve, hose, or connection may be closed, crossed, leaking, or blocked

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