When the tow vehicle slows down, the trailer moves toward the tow vehicle. The shock absorber controls random application of the trailer brakes when towing on rough roads. The coupler slides into the actuator applying force to a piston inside of a master cylinder, which applies the trailer brake.At constant speed, the brake actuator master cylinder piston is in the free (extended) position and the trailer brakes are not applied. When the tow vehicle brakes are applied, the “surge” or “push” of the trailer toward the tow vehicle automatically applies and synchronizes the trailer brakes with the tow vehicle brakes. The hitch is actually a pretty simple system. Trailer braking is controlled by the actuator mounted on the tongue of the trailer. As you can see this particular cable kit I bought covers multiple models Google that and all your replacement parts will come up. UFP is the make and my particular hitch is model A-84. If you're not sure, they will be labeled just like this. You can buy just the cable for around $13 but the catch is its almost $10 for shipping so I just hit up my local boat shop and bought a kit for under $30 which comes with a new cable, clip, and attachment plate. Now, I can only assume most of us are running some type of UFP hitch on our trailers. Luckily through the power of the internet it actually was a very cheap learning experience. Second, I questioned how much money my self inflicting wound just cost me. Now the way my mind works is a two part process, first, it was a string of curse words that if heard out load would make a sailor blush. Yup, I forgot to disconnect the boat trailer emergency brake cable! I walk to the back to see this still hanging from my hitch. I pull up to the house, disconnected the boat from my truck and go to pull away, I hear a clunk and feel a small jerk. So the other night we got home late from the lake after being out pretty much all day, the sun was already down and I was beat.
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