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Today on this 2008 Nissan Frontier, we're going to show you the SMI Stay-IN-Play Duo Supplemental Braking System, part number SM99Q51. We're going to show you what the SMI Stay-IN-Play Duo system in a typical application on this truck. First off, here's our operating unit right here. This supplies all the power to the air cylinders that operates your brakes. You have an air line that goes out to… see more >
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