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Demco Hydraulic Brake Line Kit for Single Torsion Axle Trailers - Drum or Disc Brakes

Demco Hydraulic Brake Line Kit for Single Torsion Axle Trailers - Drum or Disc Brakes

Item # DM5424
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Demco Hydraulic Brake Line Kit for Single Torsion Axle Trailers - Drum or Disc Brakes Single Axle DM5424
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Designed for single-axle trailers with either disc brakes or a drum-brake torsion axle, this hydraulic line kit includes a 16' steel line, a 17" steel line, a 5-1/2' steel line, (2) 18-7/8" flexible hose, and hardware. Call 800-298-8924 to order Demco accessories and parts part number DM5424 or order online at etrailer.com. Free expert support on all Demco products. Guaranteed Lowest Price and Fastest Shipping for Demco Hydraulic Brake Line Kit for Single Torsion Axle Trailers - Drum or Disc Brakes. Accessories and Parts reviews from real customers.
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  • Reviews (6)
  • Q & A (10)
  • Videos (2)
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Demco Accessories and Parts - DM5424

  • Trailer Brakes
  • Hydraulic Drum Brakes
  • Disc Brakes
  • Demco
  • Brake Lines
  • Brake Line Kits
  • 15 Feet Long
  • Steel Line and Flexible Hose
  • Single Axle

Designed for single-axle trailers with either disc brakes or a drum-brake torsion axle, this hydraulic line kit includes a 16' steel line, a 17" steel line, a 5-1/2' steel line, (2) 18-7/8" flexible hose, and hardware.


  • Provides lines and fittings needed to run brake fluid from surge brake actuator to trailer brakes
  • Designed for use on single, torsion-axle trailers with drum brakes or single-axle trailers with disc brakes
  • Includes:
    • (1) 193" Long steel brake line
    • (1) 17" Long steel brake line
    • (1) 66" Long steel brake line
    • (2) Hose brackets
    • (2) Brake line retainer clips
    • (1) 3/16" Brake tee
    • (4) Brake line control clips
    • (2) 18-7/8" Long flexible hoses
    • (2) 5/8" Machine bushings
    • (4) #10-16 UNC x 1/2" self-drilling hex washer-head screws

Hydraulic Brake Line Installation for Single Axle Trailers

1. 193" Long steel line runs from the hydraulic actuator to the trailer axle that has brakes.

2. Additional steel lines (17" long and 66" long) run from the 193" line out toward the trailer brakes.

3. Brake line tee connects the steel line from the actuator to the steel lines that run to the brakes.

4. Brake line clips and screws let you affix the steel lines to your trailer.

5. 18-7/8" Long flexible hoses connect the 17" and 66" long steel lines to each trailer brake assembly.

6. 5/8" Machine bushings are used in the connections between the flexible hoses and the steel lines.

7. Hose brackets let you attach the flexible hoses to your trailer.

5424 Demco Trailer Brake Line Kit - Single Torsion Axle - Drum Brakes and Disc Brakes

Video of Demco Hydraulic Brake Line Kit for Single Torsion Axle Trailers - Drum or Disc Brakes

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Demco Hydraulic Brake Line Kit for Single Torsion Axle Trailers Review

Speaker 1: Today we're going to be taking a look at the Demco Hydraulic Brake Line Kit for Single Torsion Axle Trailers. This is going to work out for drum or disc brakes. Part number is DM5424. Now, when installing your brake line kit, you'll want to of course begin at your actuator. This is a surge style coupler. You may also have an electric over hydraulic type actuator.

Wherever your outlet is from your actuator, of course you'll want to remove any caps. Those are typically capped off to prevent any fluid from coming out if they do have it in it.We want our double flare here to go all the way up and sit flush in. Then we've got our flare that'll come down. Now, on the back side of our coupler, you'll see we've removed that protective shroud. It just has two 12 millimeter bolts.

It just gives us better access to our connection point here. We've threaded in our steel brake line. Now, if you already had hydraulic brakes, this is already going to exist. If not, you'll of course want to run your new lines to get those back to your braking system.This uses a 9/16 and it's a good idea to hold that as you tighten this just to prevent this from rotating. Now, you won't need to over tighten it.

Once we test it, if we have a leak, we can tighten it up just a little bit more. If it's still leaking, we'll tighten it up just a little bit more, but we don't want to over tighten it initially. Now, we're making a pretty long run here, so we're going to use not only the clamps provided with the kit to hold these on, but also some that we have here in the shop. This is part number A0250. I'm going to use #12 self-tapping screw to secure these along our way.Now as we run along here, you want to conform the brake line to your trailer, that way we can keep everything nice and safe.

I'm going to tuck in here. Then as we go back, we'll drop underneath those cross members. You can bend this line by hand. That's how we got it straightened out, but you can also pick up a pretty cheap tubing bender here. This can help out a lot for those little more difficult bends to make. That's available. Basically, it will just fit over, and that'll give you a good curvature here so you don't have to worry about pinching your brake line as you go.As we go along, of course we use plenty of the loom clamps just to keep it secure. You can see here where we have our cross members on our trailer. It's going to drop down and around. I think this is going to be more protected than it sitting on top where it may potentially be stepped on, or maybe as you're loading or unloading a boat, in this case, maybe the boat would make contact. Now we're ready to get our T-block installed. This is going to go on the frame rail of the trailer. It allows us to connect our main line in. Then we can send a line out to each side.Now, this needs to be in a pretty specific location depending on your application. Basically, you'll have your short hard line, and then you've got your rubber flex hose. Now, this rubber flex hose is going to connect to your caliper, so clearly we can't have this T so far away that this won't reach. So, I just mocked up how we're going to do it. You want this end in our T, this end to go up on our frame rail here, and then we need to make sure we've got enough room for our flexible line to come down and meet our caliper without it being stretched and it still having plenty of room to move up and down.As you can see, that looks like a pretty good spot. It looks like we're going to get everything where we need it. There's a tab that sticks off of the back of the T-block there. We're going to use a self-tapping screw here to secure it, but we want to hold here. That's what I've got marked on my frame rail. I'm going to drill my hole. The tab goes in and our self-tapping screw will go in and that'll prevent this from ever turning. Now we can get our block put in place and get it secured with our self-tapping screw. Nice and secure.Now you're going to have a little bit of bare metal there on that hole, so it's a good idea just to hit that with a little bit of spray paint. You can see the brake line that we have coming in from the front, it's just a little bit long. Now, you've got a couple options. You can create a coil. You want your coil to start at the top, though, and work its way down. Then you'd make a bend to go in the block, but what I'm going to do, I'm going to bring this back just a little bit. Just cut it, and we're going to use our double flare tool to create the same end, just back a little bit further so we don't have excess.Now we'll attach to the block, just like we did with our coupler. Watch the angle as you do. You want to make sure that you get it threaded in there properly. We don't want this to be cross threaded, and we're back to our 3/8 wrench. We'll get that tightened down, and we'll get our line that goes over to the driver's side installed here. Same process, and again, no need to over tighten. Now, next we can position our tab. Now, this is designed to fit through just like that, and we can take our U-clip, and that's going to slide on and secure it. So, we want to ensure that we mount it in a location so we can get our line started into it.That'll be right there, or this edge. We'll use a self-tapping screw to get that secure. You can see we want to thread our rubber line into our caliper. Again, we're not going to over tighten. We can always tighten it up a little bit more later. Now, for this you'll want to use a 5/8, which is going to be the same on the other end here. We'll get to that in a minute. We're going to slide that in, place our clip on. Once that's clipped in, we just want to add our hard line into it to be sure we get it started straight. We don't want any cross threading.We'll just use our 3/8 to tighten down our hard line. Once it gets snug, it's going to want to rotate this. Then you'll use your 5/8 to just hold that in place. This is going to allow plenty of flexibility up and down as our suspension works. Now we're just going to repeat that same process for our passenger's side. You'll see as we run here, we're not going to be going across the axle. This axle is going to move up and down. It'll cause your brake line to fail. We're going to use this cross member here to get everything secured. All right. Now we've got our system bled out, but it's very important to check for leaks.We clearly don't want to be losing brake fluid, which is going to lose brake pressure. What we'll do is check each of our fittings where they come together. You want to check where your hard line meets your soft line or your rubber flex line. You want to check on the back side of your caliper where the flex line goes into it, but you also definitely want to check on the back side of that actuator. If you see any leaks at any connection point, try tightening them down just a little bit more and a little bit more until you alleviate it. If you still have a leak after that, you'll just have to redo that double flare, and that'll complete our look at the Demco Hydraulic Brake Line Kit, part number DM5424.

Customer Reviews

Demco Hydraulic Brake Line Kit for Single Torsion Axle Trailers - Drum or Disc Brakes - DM5424

Average Customer Rating:  3.8 out of 5 stars   (6 Customer Reviews)

Designed for single-axle trailers with either disc brakes or a drum-brake torsion axle, this hydraulic line kit includes a 16' steel line, a 17" steel line, a 5-1/2' steel line, (2) 18-7/8" flexible hose, and hardware.

- DM5424

Provided the plumbing needed. The kit could use a few more of the metal tubing "holders" that screw the trailer, at least for my project I need about 6 more to hold the tubing securely. 206028

- DM5424

Great product. I redid my older 20' snowmobile trailer and this kit work as advertised. 590582

Still looks good and works great.
Mark - 12/19/2019


- DM5424

OK but needed to make a field modification to make the brakes more serviceable in the future. 275586

- DM5424

Does the job 273367

- DM5424

seems like a good product. Haven"t finished installing yet. Very helpful in purchase. 190419

- DM5424

Excellent. Great fit. 177732


Ask the Experts about this Demco Accessories and Parts

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    For your Demco Kar Kaddy, the Demco Hydraulic Brake Actuator w/ Electric Lockout - Disc - Zinc - 2" Ball - 6,000 lbs # DM8605101 will work great. The Kodiak Disc Brake Kit - 10" Rotor - 5 on 4-1/2 - Dacromet - 3,500 lbs # K2R35D will not work well with the brake flange so you will want to upgrade the flange to the # 4-35 since the Kar Kaddy has a unique flange instead of the standard. The idler hubs # DM04369 will work well without any modifications. Then you will just need brake lines...
    view full answer...
  • Hydrastar Electric Over Hydraulic Brake Kit Recommendation with Single Axle Brake Lines
    Since you have a single brake axle your best option would be to go with the HydraStar EOH Kit part # HS381-9067 which includes everything but the brake lines and then from there use the from Demco # DM5424 to supply the single axle line kit.
    view full answer...
  • Aluminum Car Trailer Restoration and Replacement Brake Recommendations
    Thanks for the feedback, and I am glad that you are finding our website helpful! For your 1989 Trailex CT-7031 all aluminum trailer with the specifications that you provided there are three options for restoring or replacing the brakes for this trailer. The three options are similar to what you mentioned, and are: 1.Hydraulic Drum, which is the most cost effective. 2.Hydraulic Disc, which is more expensive, but provides better performance. 3.Electric drum, which is most cost effective...
    view full answer...
  • Compatibility of Kodiak # K2R526DS Disc Trailer Brake Kit with New EZ-Loader Axle
    As long as your new axle has a 5-bolt brake mounting flange, the Kodiak # K2R526DS should work fine for you. You'll also need a brake line kit like part # DM5424 and an actuating coupler like part # T47154107K for a 2 inch trailer ball. I've linked you to an FAQ article that shows everything you'll need to think about when you're adding hydraulic disc brakes to a trailer.
    view full answer...
  • Everything Needed to Install Electric Over Hydraulic Disc Brakes on Trailer with 3,500 lb Axle
    I can help you pick out the parts you would need and make it as simple as possible, but there isn't a single axle electric over hydraulic kit that includes everything. You would want to start the part # HS381-9067 which comes with the nicest actuator around, a breakaway kit, junction box and the needed wiring. For the brake components you would want the part # K2R35D for a 3,500 lb kit unless the trailer will be seeing saltwater. In that case you would want the # K2R35S instead. For...
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  • Can Kodiak Disc Brake Kit # K2R35D Replace Idler Hubs on Demco Tow Dolly
    Thank you for including a photo of your idler hubs. The Kodiak Disc Brake Kit you referenced, part # K2R35D, requires a standard 4-bolt brake mounting flange in order to mount. The standard 4-bolt square mounting flange that this kit will fit, part # 4-35, is shown in the linked photo which includes measurements of the hole spacing. We do not recommend drilling your existing flanges; it is better to have a qualified welder replace them with the correct ones. Your existing hub appears to...
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  • Single Axle Brake Line Kit Needed for Triple Axle Trailer to Make a Triple Axle Disc Brake Kit
    You wouldn't need a triple axle brake line kit, # T4864000, because the Titan Disc Brake Kit # T4843700 already comes with 2/3 of what you need. So you would need a single axle kit # DM5424 or # DM5425. There are adapter fittings in triple axle kit # T4864000 that are 1/4 to 3/8 inch but not in the Titan disc brake kit # T4843700 and not in either of the single axle line kits listed above.
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  • Brake Line Kit that Includes 19 Foot Steel Line for Disc Trailer Brakes on a Boat Trailer
    You could use Titan brake line kit # T4829900 instead. It comes with a 19 foot long steel line. Normally if brakes are only going onto one axle of a tandem axle trailer they go on the front axle, not the back axle. That is likely why so many kits only have a 16 foot line. You get better braking when the brakes are on the forward axle.
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  • Brake Line for Hydraulic Disc Trailer Brakes on a Single Axle Trailer
    Brake line kit # 9504 is one that we have listed for drum brake applications which have a lower psi rating than disc brakes. What I recommend is # DM5424 that works with drum or disc brakes. This means that the lines are rated for at least 1600 psi which is typical disc brake pressure. Quarter inch line is not available. If you need 1/4 inch steel line then most auto parts stores carry various kinds of brake line and you could inquire about diameter availability.
    view full answer...
  • Selecting a Brake Line Kit for Boat Trailer Being Converted to Disc Brakes
    You are correct to place your disc brakes on the rear axle of your boat trailer since this is where most of the weight will be carried (nearer to the boat's motor). Disc brake and torsion axle applications both require flexible brake lines so yes you can use the kit you referenced, part # DM5424. This kit includes 18-7/8-inch long flexible lines, but if your measurement shows you need longer flex lines we offer various sizes of lines; part # T0777300 is 13-inches; part # T0776500 is...
    view full answer...

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Info for this part was:

Written by:
Lindsey S
Installed by:
Jeff D
Installed by:
Randy B
Video Edited:
Jacob T
Updated by:
Laura H
Video by:
Zach D

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