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Kodiak Hydraulic Brake Line Kit - Single Axle - 18'

Kodiak Hydraulic Brake Line Kit - Single Axle - 18'

Item # 18SI-BLKIT
Our Price: $122.32
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Accessories and Parts 18SI-BLKIT - Brake Line Kits - Kodiak
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Brake line kit lets you run brake fluid from your surge brake actuator to your trailer brakes. Great for disc brakes and torsion axles. Includes 18', 7', and 1-1/2' flexible hoses with swivel fittings; a tee fitting; and hardware. 1-800-496-5010 to order Kodiak accessories and parts part number 18SI-BLKIT or order online at Free expert support on all Kodiak products. Great prices and Fastest Shipping for Kodiak Hydraulic Brake Line Kit - Single Axle - 18'. Accessories and Parts reviews from real customers.
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  • Reviews (88)
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Kodiak Accessories and Parts - 18SI-BLKIT

  • Trailer Brakes
  • Hydraulic Drum Brakes
  • Disc Brakes
  • Brake Lines
  • Brake Line Kits
  • Kodiak
  • 18 Feet Long
  • Flexible Brake Hose
  • Single Axle

Brake line kit lets you run brake fluid from your surge brake actuator to your trailer brakes. Great for disc brakes and torsion axles. Includes 18', 7', and 1-1/2' flexible hoses with swivel fittings; a tee fitting; and hardware.


  • Brake hoses and fittings let you run brake fluid from your surge brake actuator to your trailer brakes
    • Designed for use on single-axle trailers with drum or disc brakes
  • Flexible design makes hoses perfect for use with foldaway trailer tongues, disc brakes, and torsion axles
    • Rubber hoses meet DOT and SAE standards and are easier to install than rigid steel lines
  • Brass, male, swivel flare nut fittings on ends of each hose have deep threads
    • Deep threads improve connection to help prevent leaks
    • Swivels allow flare fittings to turn without the hose twisting
  • Open area on flare fittings lets you use a line wrench for better grip
    • Minimizes the risk of stripping threads
    • Fittings are double-crimped onto hoses
  • Corrosion-resistant, brass tee fitting connects 3 hydraulic lines
    • Female inverted flares (FIF) at each port
  • Heavy-duty loom clamps secure hoses to your trailer's frame
  • Kit includes:
    • (1) 18' Long flexible brake line
    • (1) 7' Long flexible brake line
    • (1) 1-1/2' Long flexible brake line
    • 1 Tee fitting
    • (15) 1/2" Loom clamps


  • Hose inner diameter: 1/8"
  • Fitting size: 3/16"
    • Thread size: 3/8"-24
  • 3-Year limited warranty on hoses and fittings

Hydraulic Brake Line Installation for Single-Axle Trailers

Single Axle Brake Line Kit

  • (A) 18' Long flexible brake line (BH-3MFS-18)
  • (B) 7' Long flexible brake line (BH-3MFS-7)
  • (C) 1-1/2' Long flexible brake line (BH-3MFS-1-5)
  • (D) Tee fitting (BH-T-3FIF)
  • (E) Loom clamps (A0500)

Flexible Rubber Brake Hoses

Kodiak brake hoses are made of rubber, making them a practical choice for a variety of applications. Because you can easily bend them, rubber hoses are simpler to work with than rigid stainless steel brake lines. This flexibility makes rubber hoses great for use with foldaway trailer tongues because they are less likely to kink or break when bent. In addition, rubber hoses allow for a wide range of motion so articulating parts can effectively function. These qualities make rubber hoses better suited than steel lines for trailers with torsion axle suspension systems and trailers that have disc brakes.

Stainless steel brake lines have braided exteriors, which can not only wear against exterior surfaces, but also against the interior lining of the hose if dirt gets underneath the steel braid. And if the braid on a stainless steel line tears, it can cut into the hose lining. The exterior surface of these hoses is solid rubber, so there are no crevices for debris to enter.

Durable Fittings with Deep Threads

Kodiak Hose Flare

Kodiak brake hoses have corrosion-resistant brass fittings with stainless steel flares. These fittings have a gap built into them that allows room for a line wrench - also called a flare nut wrench - to slide over the line and down to the nut. This type of wrench grips the nut better than a standard open-ended wrench so there is less chance of stripping the threads as you tighten down the nut.

The stainless steel that is used to create the flares on these hoses is stronger than brass. As a result, these fittings are more durable than ones made entirely of brass. The stainless flares are primarily designed to keep the fittings from splitting when you tighten them down, but they offer absolute rust protection as well.

Kodiak's fittings have deeper threads than many other fittings on the market to provide a higher thread engagement. Deeper threads offer an advantage when used with fittings that have the same thread depth. These Kodiak fittings will work with most fittings on the market, but when they're used with other Kodiak fittings, the result is a stronger connection with fewer leaks.

BH-3MFS-18 Kodiak 1/8" ID Rubber Brake Hose - 3/16" MFFN with Male Swivels - 216"

BH-3MFS-7 Kodiak 1/8" ID Rubber Brake Hose - 3/16" MFFN with Male Swivels - 84"

BH-3MFS-1-5 Kodiak 1/8" ID Rubber Brake Hose - 3/16" MFFN with Dead Swivels - 18"

BH-T-3FIF Kodiak Forged Brass T-Fitting for 1/8" Diameter Brake Hose - 3/16" Female Inverted Flare

A0500 Metal Loom Clamp - 1/2"

Customer Satisfaction Score:

Customer Reviews

Kodiak Hydraulic Brake Line Kit - Single Axle - 18' - 18SI-BLKIT

Average Customer Rating:  4.8 out of 5 stars   (88 Customer Reviews)

Brake line kit lets you run brake fluid from your surge brake actuator to your trailer brakes. Great for disc brakes and torsion axles. Includes 18', 7', and 1-1/2' flexible hoses with swivel fittings; a tee fitting; and hardware.


Parts were good if I got em all the first time but they left out a brake line (part of a kit) left out lug nuts (part of another kit) got damaged wheel bearings cause the way they package em and a damaged seal for the same reason the way they handled it on the phone was alright after waiting a week for original order it took another week to get the parts they forgot and I received damaged (didn’t include new bearings ) then they sent the wrong size lug nuts ????

I am sorry to hear that the reship did not correct the problem. I have sent your information over to our customer service department for them to address this and get it corrected. They should be reaching out to you here shortly.
-- Etrailer Expert Katrina B - 07/07/2022


The order worked great to match up with the new disk brakes for my boat trailer. To point out (I had to learn the hard way) be sure if you upgrade that your brake line will work, it will save you a headache.


The brake lines arrived in a timely manner. They are robust in construction and fit together easily. I am very pleased with Etrailer and will remain a loyal customer!


The trailer brakes are working great!


I ordered this kit to replace my boat trailer brake lines that have aged. I was unable to find flexible lines locally. The hoses appear to be very well made. The double flared ends are not only stainless, but low carbon stainless because there is no attraction to a magnet. The mfg date is also printed on each hose, so you can be sure you are not getting hoses that have been setting on a shelf for years. It was shipped quickly and arrived quickly even with economy shipping. George kept me informed of the package progress and sent a followup email when notification was received that it had been delivered.


Very high quality lines. The clamps were a bit too big and should be stainless steel for a boat trailer. No fastening hardware was included.


After one year they’re holding up great! They’re the best option for boat trailers, used them to replace corroded metal lines.


Nice set of replacement brake hoses. A must have to any trailer with hydraulic brakes.


I own a 25-year-old dual axle flatbed trailer that I use to haul a car behind my motorhome. It had surge brakes when I purchased it. Perhaps not unexpected, the brakes and the actuator rusted and needed to be replaced. The website of etrailer provided exactly the solution I needed; actuators, brake assemblies and hydraulic lines. Each were as advertised and the replacement was straightforward. I anticipate that I am in a good place for another 25 years of service from this trailer. I recommend etrailer without reservation.


Just what I needed. Better than manufacturer installed!


I am reviewing the components and etrailer as they are not installed yet. Online ordering was easy - I was contacted immediately with shipping time and tracking numbers - it all went really well. The components showed up on time and in good condition. The boxes were a little hammered but UPS does that. Thanks etrailer good service - good prices: what else do you want?

Really well! If one uses some kind of salt rinse the components remain free of corrosion and looking good. Everything assembled as it should and worked flawless from the start. The brakes are rock solid and do a great job of stopping my 3800# boat and trailer. I use the Dexter ElectHyd unit with the Direct link brake controller and it performs beyond my expectations...
robert b - 05/27/2021


It was exactly what I ordered. Very quick service!


I will use them for all my trailer needs in the future very help full through my trailer build.



Received Ordered fast but was missing small tee contacted customer service via email got a response within an hour of sending an email they sent the missing part same day extremely good service will order more from them as need parts.


Had to wait about a month to receive because it was out of stock at time of order, I don't hold that against etrailer just a sidebar. Pleased with the product and the ease of installation. For my particular trailer the line from the front to the axle was 18"s short but after blowing out a short line from the old line set was able to use it and completed the job. Product appears to be a quality product and well made.


Easy install. Would recommend a bleeding kit to properly bleed brake lines.


Here are my pics of my trailer brake system refurbishment.


Very easy to install. I went from no brakes to great breaks. The only thing I had to do was add a brake flange to my all aluminum axle. I made the flanges from 1/4 6x6 aluminum plates. Then took my axle off the trailer. I assembled the hubs and disc on the axle. This put everything inline for welding. Then took it to a weld shop and had the franges welded to the axle. Put it back on trailer hooked up the brake line. Blead the lines and all good.

After a year I have many trips on my new brake setup. Still works well.
Jim B - 04/21/2020


Just what I needed.


Great brake line kit for me boat I’m adding disc surge brakes


Product was easy to assemble. I had ordered this after I had ordered a 15ft kit ….too short. The one issue was that the short brake line in this kit came with a female coupling on one end. Luckily I had a previous order that contained a male coupling on both ends. I did not drill holes in the trailer to mount the lines as holes provide starting points for corrosion. I used large zip strips with hose mounting clips….worked great. I also shrouded line with rubber hose where I thought there could be wear.


Brake lines are high quality. Good flexibility. Easy to install. The metal tubing at the fittings is 3/16 tubing and appears to be stainless nice, to prevent rusting out. I installed inside of trailer tubing and used existing holes to bring it out to the calipers for a very clean and protected installation.


These brake assemblies came to Me looking great, They fit great, work Great, and best of all was the Great Price and the free shipping! 5 STAR's for this Product. Also I want to give a 5 STAR Rating for Your Customer Support, The Fast Shipping Notifications, and the After the Sale Follow up. Keep up the Great Work.
Brian K.


Product is excellent quality replaced all the lines on a 1976 Shorlandr trailer

Really happy with all the items that etrailer helped me choose, great quality and fit!I highly recommend them.
Scott L - 05/06/2021


This product worked as described. I installed these new hoses on my 25 foot boat trailer. All fittings were a perfect match to my existing wheel cylinders and master cylinder.

Show More Reviews

See what our Experts say about this Kodiak Accessories and Parts

  • Swapping Fittings on Disc Brake Caliper for Better Clearance
    I checked with my technical contact at Kodiak about swapping out the brake line and bleeder fittings on your calipers (I realize that they may not be the Kodiak brand but they are a great technical resource). My contact said that this is permissible on their brakes since both of these fittings ultimately connect to the same fluid reservoir. But you have to make sure that the bleeder screw used to bleed the brakes is the higher one (if there is more than one bleeder screw).
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  • Recommended Hydraulic Brake Line Kit for Tandem Axle Trailer that Only Has Brakes on One Axle
    Since your tandem axle trailer only has brakes on one of the axles, you will just need a single axle kit like the Kodiak Hydraulic Brake Line Kit # 18SI-BLKIT you were looking at. This kit includes an 18 foot, 7 foot and 1-1/2 foot long flexible brake line along with a tee fitting and loom clamps. I have attached a short video review on this product so you can see exactly what all is included.
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  • Recommended Brake Line Kit for Single Axle Boat Trailer
    Brake lines don't have to be difficult to run. I recommend the Kodiak Hydraulic Brake Line Kit - Single Axle - 18' # 18SI-BLKIT. This will give you one 18 foot flexible line and one 7 foot line and one 1-1/2 foot long line along with the tee fitting and clamps. So you will run a line from your master cylinder down one side of your boat trailer frame to the tee fitting. Then you will use the short line to the close brake assembly and then run the other across the width of the frame to...
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  • Best Brake Line Kit for Single Axle Boat Trailer
    The best brake line kit for a single axle boat trailer is the Kodiak Hydraulic Brake Line Kit part # 18SI-BLKIT which works with boats that have torsion or leaf spring axles as well as those with disc or drum brakes. The Kodiak Hydraulic Brake Line Kit has flexible lines so they will be much easier to work with and you don't have to worry about rusting. The Kodiak Hydraulic Brake Line Kit will be suitable for trailers up to 20' long no problem.
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  • Are Kodiak Disc Brakes Compatible with A-60 Actuator for Disc Brakes
    Yes, the Kodiak disc brakes will work with an A-60 actuator for disc brakes. If you also need a brake line kit, # 18SI-BLKIT includes an 18 foot line and # 15SI-BLKIT includes 15 foot. Both are for single axle trailers.
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  • Replacement Actuator and Hydraulic Brake Lines for 1989 Escort Boat Trailer
    Yes. As long as you have a 3" wide channel tongue, you can use the Demco Hydraulic Trailer Actuator # DM72VR as a replacement for your current actuator. For new brake lines you'll want to use the Kodiak Hydraulic Brake Line Kit # 18SI-BLKIT which will allow you to replace the brake lines on a trailer up to 18 feet long. There is also a 15 foot kit available with part # 15SI-BLKIT. I don't recommend running them outside of the frame since they could be pinched off quite easily, so we do...
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    Image 1 for
  • Are Dacromet and Stainless Brake Finishes Good for Boat Trailers
    Yes, the Dacromet/Stainless finish on the 10" Kodiak Disc Brakes # KOD39FR is arguably the best for boat trailers since it's the most resistant to rust and corrosion, although it's still a good idea to hose down your trailer with clean freshwater once you're done boating for the day. Then for a flexible brake line kit we have part # 15SI-BLKIT which comes with a 15' lead or the part # 18SI-BLKIT which comes with an 18' lead. Attached are some review videos for you to check out!
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  • Replacement Titan Model 6 Actuator and Brake Line Kit Recommendation for Trailer
    If as many parts of the coupler need replacing that you mentioned I would recommend just replacing the whole thing. It will save you the hassle of rebuilding the coupler and will give you all new components. The part # T4747210 would be a great choice as it is basically exactly what you have. For a single axle brake line kit the part # 18SI-BLKIT would work well.
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  • Recommended Brake Line Kit With Flexible Hoses For Single Axle Boat Trailer
    We do have flexible brake line kits available but the brake kits we offer do not have all flexible lines in them. The Titan Disc Brake Kit, part # T4843300 has steel lines in the kit. This is the way the kit is received from our supplier. You can order a brake line kit with flexible brake lines. I recommend part # 18SI-BLKIT. This kit would work well if you want to replace the rigid lines in the # T4843300 kit.
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  • Different Types of Brakes Lines for Boat Trailers
    Both automobile and trailer standard brakes lines are made of steel tubing like # T4336000. This item has a 3/16-inch diameter and the steel line is both copper-plated and galvanized for resistance to corrosion. Boat trailers can also be equipped with flexible brake lines that work better with torsion axles where there is movement. An example of such a kit is part # 18SI-BLKIT from Titan. Both disc and drum brakes can use the same steel lines.
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  • Brake Lines and Fittings For Single Axle Boat Trailer.
    Here are a set of brake lines and fittings for a single axle trailer # T4829900. They are 18ft long so it should be plenty of length for your boat trailer. I've included a video for you to check out to help with the install. These Rubber Brake Lines # 18SI-BLKIT would be a bit more resistant to the water since you have a boat trailer. Both are 18ft in length so choose your preference.
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  • Availability of Retrofit Disc Brake Kit with Surge Coupler for Single 3,500 Pound Axle Trailer
    For a kit with coupler that will allow you to add disc brakes to your trailer you can use the Titan Disc Brake Kit and Leverlock Actuator with Electric Lockout # T4843300. This kit is for single axle trailer with a 3,500 pound axle. Included in the kit are 2 hub and rotor assemblies with L68419 inner bearings and L44649 outer bearings, RG06-050 grease seals, races, bearing protectors, brake calipers with mounting brackets and hardware, brake line kit, and the Titan Zinc-Plated Leverlock...
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  • Recommended Brake Line Kit for Use With Titan Model 60 Brake Actuating Coupler
    The brake line kit that would be best for you will depend the number of brake assemblies, the length of the trailer and whether the brakes are drum or disc. If you have a single axle trailer using drum or disc brakes, and the distance between the actuator and the rear axle is less than 18 feet, the Kodiak # 18SI-BLKIT would work great. The flex hose is easy to work with, and you'll have no worries about a kinked brake line. For a tandem axle trailer with an actuator to rearmost axle distance...
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  • Recommended 6000 lb Surge Brake Actuator For Disc Brakes
    Your current actuator, similar to the Atwood Brake Actuator w/ Manual Lockout - Drum Brakes, will not work with disc brakes. Disc brakes require much more pressure than drum brakes so you need a different actuator to handle that application. For a compatible actuator, I recommend the Titan Zinc-Plated, Leverlock Brake Actuator - Disc - Adjustable Ball - Bolt On - 6,000 lbs # T4745720. This can be used with standard brake lines for drum or disc like # 24TA-BLKIT or # 18SI-BLKIT.
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  • Will the Kodiak Brake Line Kit Work with the eTrailer Hydraulic Brake Kits
    Yes, the 3/8"-24 fittings on the end of your Kodiak Hydraulic Brake Line Kit part # 18SI-BLKIT will work with the Hydraulic Brake Kit part # AKFBBRK-35-D. This is a very standard brake line fitting size so is works with pretty much all assemblies we offer.
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  • What Is The Thread Size Of The Brake Line Connection On The Hydraulic Trailer Brake?
    The brake line connection on the Hydraulic Trailer Brake - Uni-Servo - Free Backing # AKFBBRK-35R is a 3/8" - 24, and you can use the: - Kodiak Hydraulic Brake Line Kit # 18SI-BLKIT, if you're needing one. I have also included product overview videos of # AKFBBRK-35R & # 18SI-BLKIT for you to check out as well.
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  • Replacement Surge Brake Actuator, Brake Lines & Calipers For 2005 Mastercraft Pro V 205 Boat Trailer
    I recommend the Dexter DX7.5L A-60 Brake Actuator w Electric Lockout # DX93FR for your 2005 Mastercraft Pro V 205 boat trailer. This weld-on disc brake actuator is for a 3" wide by 5" tall frame, and includes a electric reverse lockout. It latches to a 2" hitch ball and comes primed so you will be able to weld it onto your frame and paint to match the trailers frame. I do see that your boat can be fitted to a single axle trailer or tandem axle depending on your setup will decide what...
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  • Brake Line Kit for Single Axle Trailer that Requires 17 feet, 6 feet, and 22 inch Sections
    What you would want is the part # 18SI-BLKIT which is all flexible line. This will cover the 18 foot and 7 foot sections that you need. And then for the 22 inch section you mentioned the part # bh-3mfs-2 which measures 24 inches in length.
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  • Can a 20 Foot Brake Hose be Substituted for 18 Foot Hose on Brake Line Kit?
    Yes for the Kodiak Hydraulic Brake Line Kit - Single Axle # 18SI-BLKIT what you could do is replace the 18 foot hose with the 20 foot Kodiak Hydraulic Brake Hose # BH-3MFS-20. It is the exact same hose that comes with the Kodiak kit except it is 2 feet longer. I've added a link to a video review of this hose for you to take a look at.
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  • Available 6-Foot Flex Brake Line with 3/16-Inch Male Fittings
    We do not manufacture the brake lines and brake line kits we sell; they are as they come from our suppliers such as Demco, Kodiak and Titan. But we do have a Kodiak flexible brake line # BH-3MFS-6 that has your required fittings and that is 6-feet long, just about 10-inches longer than your requested 62-inches. You can see this and all other similar brake line items and kits on the linked page.
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  • Troubleshooting Leaking Atwood Brake Actuator Coupler
    Your Atwood brake actuating coupler should not have started leaking brake fluid based on your manual lockout being engaged, so that is most likely not the issue. The only issue from leaving that lockout engaged should be the lack of trailer brakes, not a leak. The fact that you have a leak is a bigger issue as you won't have proper braking until that is fixed. You may have a line break or a master cylinder leak. If the master cylinder is bad, you unfortunately need to replace the...
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  • Parts Needed to Convert Roadmaster Tow Dolly From Electric Brakes to Surge Brakes
    The electric brakes on the Roadmaster Tow Dolly # RM-2050-1 can be converted to surge brakes if you'd like. You'll need the brake assemblies, actuator, and brake lines. For the brakes I suggest # AKUBRK-35. This includes both the left and right hand side which are specific. The brakes are labeled so you know which is which. Our most popular brake actuator is the Demco # DM72VR. This fits a 2 inch hitch ball and has a capacity of 6,000 pounds. For a brake line kit I would go with...
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  • Wheel Bearings and Brakes for 3,500 lb Trailer Axle of EZ Loader Boat Trailer
    Based off the VIN we don't have a way to look that up as we don't have access to that. What is your axle capacity and what is your wheel bolt pattern? If you can get me that I can help.
    view full answer...
  • Brake Line Kit to be Used with Kodiak Disc Brake Kit K2R35S
    The Kodiak disc brake kit part # K2R35S is designed for one axle. So it fits the left and right of a single axle. If you had a tandem axle you would need to buy two sets of this. I like flexible brake line as it's easier to work with. So for a single axle trailer you would want the part # 18SI-BLKIT. If you have a tandem axle trailer you instead would want the part # 20TA-BLKIT.
    view full answer...

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