bing tracking image
  1. Accessories and Parts
  2. Redline
  3. Trailer Brakes
  4. Hydraulic Drum Brakes
  5. Disc Brakes
  6. Brake Lines
Hydraulic Line Kit, 3rd Axle - Drum and Disc

Hydraulic Line Kit, 3rd Axle - Drum and Disc

Item # 9579-01
lowest price pledge
Our Price: $79.75
Accessories and Parts
Orders above $99 qualify for Free Shipping
Shipping Weight: 1.43 lbs
Hydraulic Line Kit 3rd Axle - Drum and Disk
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

Need help with installation?
Locate installers near me
1-636-306-4830 to order Redline accessories and parts part number 9579-01 or order online at Free expert support on all Redline products. Guaranteed Lowest Price and Fastest Shipping for Hydraulic Line Kit, 3rd Axle - Drum and Disc. Accessories and Parts reviews from real customers.
  • All Info
  • Reviews (4)
  • Q & A (0)
  • Photos
  • Why etrailer?

Redline Accessories and Parts - 9579-01

  • Trailer Brakes
  • Hydraulic Drum Brakes
  • Disc Brakes
  • Brake Lines
  • Brake Line Kits
  • Redline
  • Third Axle
  • Steel Line and Flexible Hose

Trailer Hydraulic Line Kit for 3rd Axle
  • Use with Tandem Axle Deluxe Drum Kit # 9579-2
  • Will work on Deluxe Drum trailer brakes and 3.5K - 8K trailer Disc brakes

Customer Reviews

Hydraulic Line Kit, 3rd Axle - Drum and Disc - 9579-01

Average Customer Rating:  4.8 out of 5 stars   (4 Customer Reviews)


Perfect kit for adding to the hydraulic brake actuator so you can make hydraulic brakes work on a triple-axle trailer. Plenty of adapters and hardware to add the extra axle or replace components on your trailer.


Excellent quality of merchandise and fast delivery.


Everything fit perfectly!



See what our Experts say about this Redline Accessories and Parts

  • Parts Needed to Add Hydraulic Drum Brakes to Tandem Trailer
    We have a FAQ article that covers everything you will need to add hydraulic drum brakes to your trailer. I have linked it for you. There are essentially 5 to 6 components you will need. First, the spindles need to have brake mounting flanges on them. To add flanges, they have to be welded on by a qualified professional that has performed this job before. It takes a special jig to weld the flanges on correctly. I have linked our flanges for you. Welding on flanges will negate the need for...
    view full answer...
  • Brake Line Kit to Add Second Axle of Brakes to Trailer
    For a brake line kit to add a brake axle to an existing setup you'd just need the part # 9579-01. This is listed as a 3rd axle kit but in reality it's the same thing as adding a second axle.
    view full answer...
  • Parts to Replace Hydraulic Brake System on a 2004 Magic Tilt Trailer
    We can definitely get you started with parts for your Magic Tilt Trailer, but we will need some additional information to complete your parts list. We can start with a coupler. Since your boat trailer will not exceed 10,260 lbs, I recommend looking at a coupler like the Titan Zinc-Plated Brake Actuator for Disc Brakes, # T4750620. This coupler has a 3 inch drop like the coupler you referenced, but it has a 12,500 lb weight capacity which is closer to the weight of your trailer. Using...
    view full answer...
    Image 1 for Image 2 for
  • Parts Needed to Convert Tandem Trailer to EOH Disc Brake Operation
    First you'll want to check your factory controller to make sure it can operate with electric-over-hydraulic (EOH) brakes; not all controllers can. If you need a new one I recommend the Tekonsha P3 # 90195. For an actuator, brake line and breakaway kit all together use part # CAR-HBA16-2. You'll need a second line kit # 9579-01. I included a link to our page for 8K-rated disc brakes. All use a 8-on-6-1/2 bolt pattern and fit wheels 16-inches and up. You have options in the choice of finish...
    view full answer...
  • Parts Needed for Disc Brake Conversion on Take 3 Auto Transport Trailer with Three 7,000-Lb Axles
    I looked up the Take 3 auto transport trailer and it showed it has electric brakes. To convert your electric brakes to disc brakes you will need to use the disc brake conversion kits for 7,000-lb axles with the hub and rotor, hydraulic line kits for three axles, electric over hydraulic actuator, trailer breakaway kit, and a brake controller that is compatible with electric over hydraulic brakes. The disc brake conversion kits will come in pairs, so you will need three sets. These kits...
    view full answer...
  • Boat Trailer with Disc Brakes on Front Axle Slamming Back and Forth when Stopping
    It sounds like your boat trailer simply does not have quite enough stopping power when you are applying the brakes from your tow vehicle. This will certainly result in the back and forth slamming/jerking you are experiencing. I do recommend adding disc brakes to the rear axle of your trailer. Doing this should greatly reduce these symptoms. In order to choose the right disc brake assembly for your trailer, you will need to know the axle capacity, wheel bolt pattern and the part numbers...
    view full answer...
  • Recommended Disc Brakes and Brake Lines For Second Axle on 2013 Venture Boat Trailer
    The Kodiak Disc Brake Kit - 10" Hub/Rotor - 5 on 4-1/2 - Dacromet - 3,500 lbs # K2HR35DKG will work fine on the second axle of your 2013 Venture boat trailer as long as the bearings and seal inner diameters match your spindles. This kit has the most standard sizes compatible with the vast majority of 3500 lb axles. The inner bearings are L68149 with inner diameter 1.378 inches. The outer bearings are L44649 with inner diameter 1.063 inches. The grease seal 10-19 has an inner diameter...
    view full answer...
  • Disc Brake Conversion Kit for 1991 Shore Lander Trailer
    Yes. In order to add hydraulic disc brakes you will need to use the Kodiak Disc Brake Kit # K2R35S and the HydraStar Electric-Hydraulic Actuator w/ Line Kit for Disc Brakes # CAR-HBA16-2, which will give you a completely new disc brake setup for your 1991 Shorelander. The Kodiak Disc Brake Kit # K2R35S uses a 10" rotor with a 5 on 4-1/2 bolt pattern and has a capacity of 3500-lbs, which will work well for your Shorelander. The Hydrastar kit comes with an actuator and all of the brake lines...
    view full answer...
  • Switching Over a Triple Axle Gooseneck Trailer from Electric to Hydraulic Trailer Brakes
    Yes, you should be able to switch your triple axle gooseneck trailer over to hydraulic drum brakes from the existing electric brakes. You would need to select the proper hydraulic brake assemblies by axle capacity and brake mounting flange pattern, then add brake lines to the trailer and install an electric over hydraulic actuator on the trailer. You will also need an electric brake controller that is compatible with electric over hydraulic units. Your existing brake hubs should work with...
    view full answer...
  • Parts to Convert Electric Brakes to Electric Over Hydraulic Brakes
    Converting from electric brakes to electric over hydraulic brakes will give you the most effective braking setup available. You are going to need a number of different parts, and the HydraStar Electric Over Hydraulic Actuator Kit # HBA-10-252-82 will give you an electric-hydraulic brake actuator, a brake line kit, and breakaway kit. Because you have a triple axle trailer, you are going to need an additional hydraulic line kit # 9579-01. If you are interested in a new brake controller, the...
    view full answer...
  • Changing Out Drum Brakes on Triple Axle Trailer to Disc Brakes
    You will need three of the Kodiak Disc Brake Kit for 8k Dexter axles # K2HR858A. This an oil based lube system so you will need the bearing kit and seals # DBRKHW850 designed for it. We recommend oil base systems for triple axles because of the temperatures from the weight of the trailer on the axles. To get the brakes up and running, use # CAR-HBA16-2 and # 9579-01.
    view full answer...
  • Recommended Disc Brake Assemblies for Nev-R-Lube Bearing 7,000 or 8,000 lb Axle Capacity
    For your upgrade to disc brakes, we have the Dexter Disc Brake Kit - 12-1/4" Hub/Rotor - 8 on 6-1/2 - E-Coat - 8K - Nev-R-Lube # K71-646-2-91. This will give you the assemblies to fit your 7K axles which are the same bearing size as the 8K axles, but you will also need to upgrade your brake actuator as disc brakes require a psi rating of at least 1,500 lbs compared to the 1,000 lbs of drum brakes. These assemblies will work with zero offset wheels that are 16 inches or larger. You...
    view full answer...
  • Converting From Drum to Disc Brakes On a 2020 Grand Design Momentum with 7K Axles
    In order to convert the electric drum brakes on a 2020 Grand Design Momentum to hydraulic disc you can indeed use the Kodiak Disc Brake Kit part # K2HR79 which have oil bath lubrication. That said, you will need a list of other components which I have attached for you. Disc Brakes: part # K2HR79 (1 Per Axle) Inner Bearing: part # 25580 (2 Per Axle) Outer Bearing: part # 02475 (2 Per Axle) Seal: part # 9103309 (2 Per Axle) Brake Actuator and Lines: part # CAR-HBA16-2 (1) part # 9579-01...
    view full answer...
  • Parts Needed to Convert 2008 Inferno Toyhauler to Disc Brakes
    The Kodiak Disc Brake Kit # K2HR79E fits your Lippert 6k axles and has the 8 lug bolt pattern like you need so it would be exactly what you'd want. You'd need a set for each axle. For bearings you'll need part # 25580 and # 02475 for each assembly plus the seal # RG06-070 for each assembly. For a triple-axle disc brake trailer you will want a 1600-psi electric-over-hydraulic actuator to ensure sufficient operating pressure. We offer a nice kit from CTS, the HydraStar Marine Electric Over...
    view full answer...
  • Recommended Electric Over Hydraulic System For Disc Brakes On Triple Axle Trailer With 7K Axles
    For your 7,000 lb axles, I recommend the Kodiak Disc Brake Kit - 13" Hub/Rotor - 8 on 6-1/2 - E-Coat - 7,000 lbs # K2HR79E. This kit uses inner bearing # 25580 (inner diameter of 1.750 inches) and outer bearing # 02475 along with oil seal # RG06-070 which has an inner diameter of 2.250 and an outer diameter of 3.376 inches. You will want to double check these measurements on your spindle using a caliper like # PTW80157 to confirm a fit. I've attached an article to assist. For your...
    view full answer...
  • Kodiak Disc Brake Kit for 2018 Jayco 377RLBH 5th Wheel
    I would be happy to help you set up your 2018 Jayco 377RLBH 5th wheel for disc brakes. We don't have a complete kit available with all the lines and bearings you will need but I can give you all of the part numbers. The Kodiak Disc Brake Kit - 13" item # K2HR79 you were looking at is a great set of disc brakes that will be perfect for your Dexter 7k axles. Depending on the region of the country you are in and how much traveling you do on salty roads I recommend spending a little extra on...
    view full answer...
  • Recommended Electric Over Hydraulic Conversion for Dutchmen Voltage 3818 Toy Hauler Triple Axle
    We do have the ability to convert your Dutchmen Voltage 3818 to Electric over Hydraulic brakes. First you will want the brake assemblies and for those, I recommend the Hydraulic Brake Kit - Uni-Servo - Free Backing - 12" - Left/Right Hand Assemblies - 5.5K to 7K # AKFBBRK-7 (one kit per axle). Then you will need brake lines like the Deluxe Hydraulic Line Kit - Tandem Axle - Drum # 9579-2 along with the Hydraulic Line Kit, 3rd Axle - Drum and Disc # 9579-01. Then I recommend the HydraStar...
    view full answer...
  • Electric Over Hydraulic Disc Brake System for 1997 Eagle Triple Axle Boat Trailer
    Our suppliers don't offer a triple axle disc brake kit, but the next best cost effective option would be to use an existing kit and add to it. Assuming your current hubs use a # L68149 inner bearing, # L44649 outer bearing and a 10-19 seal, part # RG06-050 and a 5 lug on a 4-1/2 inch bolt circle, I'd recommend the following parts. I'd recommend beginning with the Titan Disc Brake Kit and BrakeRite II SD Electric-Hydraulic Actuator, part # T4843700, which includes the plug and play EOH...
    view full answer...
  • Converting Triax 5th Wheel Trailer with 7k Dexter Axles to Disc Brakes
    We have the Kodiak Disc Brake Kit part # K2HR712D which is the correct hub/rotor set for the 7k axles on your trailer. You'd need 3 of these for your trailer and then an electric over hydraulic actuator like the # HBA16 you mentioned. I would actually recommend the # HBA16-252-82 though as it comes with the breakaway kit plus enough lines for two of your axles. For the third axle you'd then want the part # 9579-01.
    view full answer...
  • Recommended Disc Brake Conversion Kit for 2020 Grand Design Momentum with Triple Axle
    I have a solution for you, but unfortunately the # K2HR79 cannot accept 1/2" wheel studs. In order to convert from electric brakes to disc brakes with an oil bath, that will also allow you to use your current 8 on 6-1/2 bolt pattern with 1/2" studs you'll want to use the Dexter Disc Brake Kit # K71-694-695-11. These rotors have an E-coat finish for better protection against the elements and the hub comes with the bearings, races, seals and oil caps included, so you won't have to track down...
    view full answer...
  • Recommended Disc Brakes For 2016 Grand Design GD Momentum With Lippert 7000 lb Triple Axle
    For your Lippert 7,000 lb axles on your 2016 Grand Design GD Momentum triple axle trailer, I recommend the Kodiak Disc Brake Kit - 13" Hub/Rotor - 8 on 6-1/2 - E-Coat - 7,000 lbs # K2HR79E. These fit the industry standard number 42 spindles. For this you will need the inner bearing # 25580 and outer bearing # 02475 along with oil seal # 10-63. I recommend you check the bearing diameters to make sure they match your spindles. I've attached a photo and article to assist. For your disc...
    view full answer...
    Image 1 for

Do you have a question about this Accessories and Part?

  • Why

    At we guarantee:
  • Highest quality accessories and parts for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate accessories and part information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Employee Jameson C
Expert Research:
Jameson C

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.