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On our Chevy Kodiak 4500 with the factory equiped exhaust brake it was advised that we use the exhaust brake on a regular basics. Because if not used it would be harmful to the units ability to work properly. I didn't use it all the time but on occasion I would use it such as running on the interstate when exiting when not pulling the 5er. Its not a good idea to use it on wet surfaces when bob-tailing. GBY....
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