Luxury Coach Lifestyles - View Single Post - New owners of 1999, #516
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Old 10-27-2011, 12:56 PM   #5
folivier
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Location: Thibodaux, LA
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Could it be for an auxilliary air brake for a trailer?
Some 18-wheelers have this so they can apply the trailers brakes if it starts to jackknife or on slippery roads.
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