Why is the sequence of checking each trailer's brakes, from front to back, important on a triples combination?

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1. Only the order used for coupling matters, not for brake checks
2. Checking back to front is legally required, and front to back is never permitted under any circumstance
3. It helps isolate exactly which unit has a problem if one trailer's brakes don't work correctly
4. Sequence doesn't matter as long as all trailers are eventually checked

Correct!

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