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The coupling, electrical connections, and brake lines
In a passenger combination you must verify the coupling and also the electrical connections and, where present, the brake lines, because any failure affects the safety of the whole combination.
Only the bus climate system
Only the door locking of the towing vehicle
Explanation
In a passenger combination you must verify the coupling and also the electrical connections and, where present, the brake lines, because any failure affects the safety of the whole combination.
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