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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: $131.09
Accessories and Parts
Shipping Weight: 2 lbs
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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. 1-800-940-8924 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 (110)
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Kodiak Accessories and Parts - 18SI-BLKIT

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

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:  4.7 out of 5 stars   (110 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.


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!



I sold the trailer after rebuilding it cause I ended up selling my boat without the trailer. The fellow that bought it said the brakes were fine for the trip home but he never put his boat on the trailer. So I can’t really say anything else about the product.


Well, I’m pretty sure the consensus here would be to totally replace this Titan model 60 brake master cylinder that is in a friend’s boat trailer. I already ordered the new master cylinder from etrailer and about to install it. This old master cylinder is nothing more than a lack of proper maintenance. As a result, I am replacing EVERYTHING from this point and back to the calipers, including NEW CALIPERS and NEW BRAKE LINES . Proper maintenance would have totally alleviated this issue (and it is not my friend’s fault whatsoever because he just recently purchased this boat and trailer). I will post a pic of the install once finished. God Bless.


the kodiak brake line kit was as expected nice to run with good brake fittings, a lot better than bending metal brake lines and flaring ends, the hard part was bleeding them. had to purchase a 60 dollar brake bleeding kit and get good help.with a brand new actuator and lines and brakes lots of hard work bleeding brakes.


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.


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


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 ????

Etrailer Expert

Katrina B.


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.


This was supposed to arrive on 6/21. Now it won't arrive untill 6/26. When the order was placed it was supposed to arrive 6/21

Etrailer Expert

Jenny N.


My apologies for the delay in shipping out your order. It has definitely been a busy summer and we are working as quickly as possible to ship out orders. I will have our Customer Service team reach out to you.


Easy, fast update for a trailer.


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




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.


Easy to assemble and good price.


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.

Jim B.


After a year I have many trips on my new brake setup. Still works well.


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?

Robert B.


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...


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.


The trailer brakes are working great!


The Installation was easy. Everything fit perfectly and the brakes are working well. I only wish I had made the conversion from drum brakes years earlier.

William S.


Still great - no problems


Good deal and delivery was on time


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.


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.


I have not installed it yet, but it is clearly a very sturdy and durable kit.
I will use it to replace my 10-year-old original brake lines that are still working but as I am replacing the whole brake system, I mean to do it from A to Z. Clearly it is better quality than the original ones, so I presume it will last longer.
One of the connections came without the regular cap for protection, but the package was so well done that it looks perfect. I am not concerned.
Great product, high quality.


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.


Replaced all the steel and rubber lines on my boat trailer. Perfect! Couldn't ask for better.

Jim K.


Still perfect!

Show More Reviews

See what our Experts say about this Kodiak Accessories and Parts

  • 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.
    view full answer...
  • 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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  • single and Tandem Axle Brake Line Kit for a Dexter Hydraulic Trailer Brake Assembly
    For the Dexter Galphorite Free-Backing Hydraulic Trailer Brake Assembly # T4489600 you can use the Kodiak Hydraulic Brake Line Kit # 18SI-BLKIT for a single axle brake line kit or # 18TA-BLKIT for a tandem axle kit.
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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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  • 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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  • Does the Kodiak Hydraulic Brake Line Kit Come with Hardware
    The Kodiak Hydraulic Brake Line Kit part # 18SI-BLKIT doesn't come with hardware for the liner holders. The reason for this is that the exact hardware you need will vary by application and preference. In most cases, self-tapping screws will be best but other times you may want to drill and bolt the line in place. If you want to pick up some self-tapping screws with the line kit I recommend the Self-Tapping Screw part # FA1131822.
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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...
    view full answer...
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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.
    view full answer...
  • 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
  • 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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  • 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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  • 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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  • Determining Boat Trailer Drum Brake Size With an Measurement of 14" Across The Backing Plate
    The diameter of a drum brake is measured inside the hub so your 14" outer diameter is most likely a 12" drum brake. Depending on the age of your axles on your trailer I may be able to look up what the manufacturer installed on the axle by the serial number. This is generally found on the tag in the center of the axle. If you are only looking for a replacement brake assembly this is generally determined by the weight capacity of the axle. The Hydraulic Brake Kit # AKFBBRK-7-D fits on 5,200-7,000lb...
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    Image 1 for
  • 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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  • Are Dacromet and Stainless Brake Finishes Good for Boat Trailers
    Yes, the Dacromet/Stainless finish on the 10" Kodiak Disc Brakes # KOD67FR 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 Brake Line Options for a Tracker Boat Trailer
    We do carry brake lines and brake line kits, but they are not specific to any one brand or make of trailer. We have kits like the Kodiak Hydraulic Brake Line Kit # 18SI-BLKIT which comes with brake lines, t-fittings and clamps or we have just lines like the Kodiak Hydraulic Brake Hose # bh-3mfs-18. We have both the kits and lines available in different sizes and materials. I have linked our selection for both the kits and lines for you to check out and see if we have what will fit your...
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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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  • Is There a 20 Foot Flexible Hydraulic Brake Line Hose
    There is indeed a 20 foot flexible hydraulic brake line hose, from Kodiak: - Kodiak Hydraulic Brake Hose - 3/16" Male Fittings w/ Stainless Flares - 1/8" ID # bh-3mfs-20
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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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  • 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.
    view full answer...
  • 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.
    view full answer...
  • How to Determine if the Demco Hydraulic Brake Actuator Will Work on a 1983 EZ Loader Boat Trailer
    The Demco Hydraulic Brake Actuator # DM72VR will work for your 1983 EZ Loader boat trailer, as long as it has a straight, 3" wide trailer tongue. From what I could find on your trailer, that does appear to be the case. But to be safe, I recommend double checking that is the the tongue style that you have. As long as that is the case, the Demco Hydraulic Brake Actuator # DM72VR will work for your boat trailer. This brake actuator does not come with a reverse lock-out, so you will want...
    view full answer...
  • Replacement Surge Brake Actuator For a 2003 Jayco Qwest Pop Up Camping Trailer
    It appears your 2003 Jayco Qwest uses an A-frame tongue which would require a Demco Hydraulic Brake Actuator # DM8609502 to be welded on in place of your Atwood 85736 master cylinder. We do have the Demco Hydraulic Brake Actuator # DM72VR which bolts to a 3" wide straight tongue if you do not have an A-frame tongue.
    view full answer...

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