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Today on our 2014 Nissan Versa, we're going to be taking a look at . I'm going to show you how I install the SMI Stay and Play Duo Supplemental Braking System, part number SM99251.First let's go over the operating unit. This is what is going to send the air pressure to your actuator to apply the brakes. How it does that is through an electrical current. You're going to have four wires that are… see more >
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