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The pan-caps won't be flush, but they will close off airflow from the outside. Most of the air for brake cooling comes from the inside, where the brakes are, but I see your point. I use engine braking a lot, and have never had trouble with hot brakes, but the smell of overheated truck brakes is very common in the mountains. My van has an electric trailer brake, and if I'm going to do towing I would most likely be prepping my vehicle differently by removing the pan-caps and the grill block. This is why I'm trying to do modifications that are more modular and easily removable. If I have to load the van down, I don't want to spend hours reversing aerodynamic modifications.
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