Pennsylvania CDL Double/Triple Trailers Practice Test

What should be checked if the rear trailer service brakes do not apply during a brake test?

Air-line connections, shut-off valves, air supply, and brake defects before moving Only the windshield washer fluid Only the tractor fuel level Nothing if the lead trailer brakes work

Correct Answer:

Air-line connections, shut-off valves, air supply, and brake defects before moving

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