Dexter Hydraulic Brake Union - 3/16"

Video Transcript for Demco Hydraulic Brake Line Kit Installation DM5402

Today in this boat trailer we're going to install part number DM5402. The Demco hydraulic brake line kit for single axle trailers. A couple of things to know about this trailer before we start off that the axle already replaced for new axle, so we need to add our brake line kit to this. Our first step is to go ahead and remove the original brake line that's inside the frame. Cut off one end from the master cylinder and go ahead and help pull it out. Once the old line removed we can go ahead and install our new line that goes up to the coupler.

Just leave a long line that come in the kit. First off, we'll go ahead and wrap one end up with tape to help protect it as you push it to the frame. Now, we'll go ahead unravel slowly as you push it through the frame until it reach the end. Now on this case we find that this length of line is too short. To help extend it, we're going to use part number T1061900 and tighten. This is a 30-inch length of brake tubing.

To connect our first line we're also going to use a hydraulic brake union part number T1287900. We'll go ahead and thread this parts together and then tighten them down then we'll continue on pushing it align into the frame. Once we reach the end of our brake line, we'll go ahead and manipulate and bend it until it fit the original fitting on the end of the frame. Basically, just gently bend and move around as needed until we get to the right S shape that goes into the frame, it doesn't rub inside of the hole but also goes through our bracket that preexisting on the frame, but we'll go ahead and install a flexible line. Now our flexible line will fit into the bracket that's where we weld it into the frame. We'll go ahead and push it into place and then install the clip that will hold it.

Sometimes it might be helpful to go ahead and run two lines together first. Now at other end in the flexible line, we'll get the T fitting. We'll go ahead and thread that into place. At this point we'll go ahead and tighten down the T fitting to the flexible line, then you want to take note on how a T fitting is going to sit on the axle. Now, we'll go ahead and go from our T fitting over to the closest wheel. We'll take our line and throw it into the wheel cylinder and then we'll go ahead and thread it into our T fitting.

We'll go ahead and just get them started but not tighten down. We'll still need to have everything loose and flexible as we install the second line. We'll go ahead and run over to our T fitting and then run over to the wheel cylinder on the other side. Then, you want to in coil this wire and be as straight as possible to get the maximum length out of it. Then, we'll go ahead and lose this thread into the wheel cylinder. Once we have all our fittings loose and installed, we'll go ahead and tighten them down for good. Now, we'll go ahead and take a look at our T fitting. Now it has a bracket built into it that we can use to attach to the axle. Now this is the time to make adjustments on the lines, then we'll go ahead and attach our T fitting to the axle. In this case, all we're going to use is a number 14 self tapping screw to attach it to your axle. You also want to double check to make sure if it lines that go towards the wheels are on top of the U-bolts. Sometimes the top of the U-bolts can hit the bottom of the frame and you don't want the brake lines pushed in between the two. We'll start the connect are done underneath the axle, we'll go back up to our master cylinder and make our final connection. We'll go ahead and take of our excess line and coil them underneath the coupler and then thread it into the master cylinder. We'll go ahead and tighten it down. In this point we can go ahead and fill the master cylinder for fluid and bleed the brakes. When we bleed the brakes, it's a good idea to have an extra set of hands to help push the cylinder in while another set of hands opens up the valves behind the wheel cylinders. To help contain the old brake fluid, we use a rubber line. We'll slip the rubber line over the valve and then in the other end we'll go into an old jar to collect the old fluid. Bleeding brake is pretty simple. Let's go ahead and push in on the cylinder upfront and then we open up the valve in the back. We'll go ahead and make sure if the fluid pushes out all the air. When there's no more bubbles left, we're finish. We'll down for close fitting to the master cylinder. Now we'll go the other side and repeat the same process. Once everything is bled out, it's good idea to check for leaks one more time and then we're finish. It's a good idea to take a short test drive and go ahead and top off the reservoir and with that, that'll finish it for our install part number DM5402 on this boat trailer. .