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  1. Trailer Brakes
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Hydrastar Disc Brake Kit w/ Actuator for Triple Axle Trailers - 1/2" Studs - 8 on 6-1/2 - 7K
Hydrastar

Hydrastar Disc Brake Kit w/ Actuator for Triple Axle Trailers - 1/2" Studs - 8 on 6-1/2 - 7K

Part Number: HSE7K-TR1
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$3,441.91
Trailer Brakes
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Kit includes everything you need to switch your trailer over to disc brakes for improved performance and greater stopping power. Dacromet-coated brakes are corrosion resistant. Perfect for use with boat trailers. Great Prices for the best trailer brakes from Hydrastar. Hydrastar Disc Brake Kit w/ Actuator for Triple Axle Trailers - 1/2" Studs - 8 on 6-1/2 - 7K part number HSE7K-TR1 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (11)
  • Q & A (0)
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Hydrastar Trailer Brakes - HSE7K-TR1

  • Disc Brakes
  • 7000 lbs Axle
  • Hub and Rotor
  • Marine Grade
  • 8 on 6-1/2 Inch
  • Hydrastar
  • 1/2 Inch Studs

Kit includes everything you need to switch your trailer over to disc brakes for improved performance and greater stopping power. Dacromet-coated brakes are corrosion resistant. Perfect for use with boat trailers.


Features:

  • All-inclusive kit has everything you need to switch your trailer over to disc brakes
    • 6 Disc brake end kits
      • Hub-and-rotor assemblies
      • Grease seals, caps, races and bearings
      • Calipers with mounting brackets and hardware - attach to 5-bolt brake flanges
    • Hydrastar electric-over-hydraulic brake actuator
      • Hardwires into tow vehicle and signals in-cab brake controller when brakes are applied, triggering pump and motor on actuator
      • Creates smooth, even braking with fast response time
      • Works with most in-cab brake controllers (sold separately)
    • Line kit with brake lines and fittings for triple-axle trailers
  • Disc brakes deliver better performance
    • Consistent stopping even at highway speeds
    • Shorter stopping distance than most drum brakes
  • Trailer coupler not included


Specs:

  • Axle capacity: 7,000 lbs
  • Bolt pattern: 8 on 6-1/2"
  • Rotor diameter: 13"
  • Wheel stud diameter: 1/2"
  • 3-Year warranty


Bearings, Race, and Seal Information:

  • Bearings
    • Inner bearing 25580
    • Outer bearing: 14125A
  • Races
    • Inner race: 25520
    • Outer race: 14276
  • Seal: GS-2250DL
    • Inner diameter: 2.250"
    • Outer diameter: 3.376"

Complete Kit Includes:

  • Hydrastar electric-over-hydraulic trailer brake actuator
  • 7K disc brake kit including hub-and-rotor assemblies with bearings, races, and seals
  • Hydraulic triple-axle brake line kit
    • (1) 30' Long brake line - 3/16"
    • (1) 6' Long brake line - 3/16"
    • (6) 4-1/4" Long brake lines - 3/16"
    • (6) 18" Male/male rubber flex lines
    • (3) 3/16" Brass T-fitting
    • (2) 3/16" Brass union fitting
    • (1) 3/16" Brass X-fitting
    • 1/2" Nylon hose clamps
    • 3/16" Nylon hose clamps
    • Self-tapping screws

Disc Brakes

More and more people are switching their trailers over to disc brakes, and with good reason. Disc brakes deliver consistent braking - even at highway speeds - unlike drum brakes, which often show a substantial drop in braking torque at higher speeds. In addition, disc brakes offer a substantially shorter stopping distance than drum brakes. Disc brake calipers have only one moving part, rather than the many found in drum brakes. This means that there are fewer parts to maintain, fewer parts to get damaged and fewer parts to have to repair or replace, thus reducing maintenance costs.


Integral Hub-and-Rotor Assemblies

The integral hub-and-rotor is made from cast iron, matching SAE specifications. Cast iron is ideal for high-temperature operations and offers a favorable friction coefficient to ensure adequate stopping power. Furthermore, machined disc brakes minimize the chance of contamination between the hub and rotor, resulting in excellent performance and long life.



E7K-TR1 Hydra Star Disc Brake Kit w/ Actuator for Triple Axle Trailers - 13" Hub/Rotor - 8 on 6-1/2 - 7K





Customer Satisfaction Score:


Customer Reviews

Hydrastar Disc Brake Kit w/ Actuator for Triple Axle Trailers - 1/2" Studs - 8 on 6-1/2 - 7K - HSE7K-TR1

Average Customer Rating:  4.4 out of 5 stars   (11 Customer Reviews)

Kit includes everything you need to switch your trailer over to disc brakes for improved performance and greater stopping power. Dacromet-coated brakes are corrosion resistant. Perfect for use with boat trailers.

by:

Installed these brakes on my 5th Wheel in the summer of 2023. Completed the installation in two easy days with 2 other old men. Takes a little creativity placing hydraulic lines and the pump. Love this conversion. Never go back to drum brakes. Had to go from 10 gain on the drum brakes to 3 gain on the disk brakes. Driving through heavy traffic is so much less stressful knowing I have 10 wheels with disk brakes (6 on the RV and 4 on the truck). Stopping distance is reduced enormously. No problems with any component in the packaged as of 07/2024.



by:

Hello we have a triaxle 45' Toater trailer combination we use for racing. Total rolling loaded weight is 46k. The trailer was equipped from factory with electro magnetic brakes that in combination with the air brakes on the truck using digital controller was very ineffective ! WE installed these and it now stops like your car ... VERY VERY good solution ! we had one clearance problem with the top caliper bolt and the inner finder that was easily modified for clearance. This solution is a effective easy to install and it improved my trailer stopping power 100% ... also you will need a double flair tool for a clean instillation



by:

This is a great upgrade to any large trailer. I have a 44’ toy hauler, w/ triple Lippert 7000lb axles. We’ll worth the $$. Took me about 12 hrs to install.



by:

Everything arrived as it should. Packaging was falling apart. Need to do a better job on packaging boxes were extremely heavy. Should put it in more boxes. Customer service was very good to work with called me and let me know something was on back order.And will keep in touch with me.



by:

Finally installed after snow fell, Did not use supplied bearings as they were shipped loose in a plastic bag and not wrapped up and individually boxed as when you buy from a bearing supplier, so I purchased new timkin taper bearings and installed them instead. Bleeding the system was simple enough, now I just have to wait till spring to road test system.



by:

Disappointed in how this item was packaged and shipped. You can’t ship stuff out in a box of 108 lbs with ups, what are these people thinking in the shipping department.

Katrina B.

10/10/2022

This is not good at all! I see that our customer service department is currently working on your damage claim with UPS.



by:

Customer service was beyond exceptional. Received products in timely fashion. We haven't installed items yet, but they look to be of good quality.



by:

Good to deal with



by:

Good



by:



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11
11

See what our Experts say about this Hydrastar Trailer Brakes

  • Will Hydrastar Disc Brake Kit Fit 7k Lippert Axles
    Yes, the Hydrastar Disc Brake Kit w/ Actuator for Triple Axle Trailers # HSE7K-TR1SO will fit over hubs with an 8 on 6-1/2 bolt pattern on your 7k Lippert axles. If you don't already have idler hubs you can use the # AKIHUB-865-7-2-EZ-K. The other option is to get the full hub and rotor with # HSE7K-TR1. You will need a brake controller that is compatible with electric over hydraulic like the Prodigy P3 # 90195.
    view full answer...
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  • Availability of 7K Disc Brake Kit w/ Actuator for Triple Axle Trailers with 9/16 in Wheel Studs
    Yes we do have a version of the Hydrastar Disc Brake Kit w/ Actuator for Triple Axle Trailers # HSE7K-TR1 that has 9/16 inch diameter wheel studs with the part # HYD54FR.
    view full answer...
  • Recommended Comfort Ride Suspension and Disc Brake System for a Triple Axle Trailer w/ 7k Axles
    Thanks for the pictures! The correct Comfort Ride System for your triple axle trailer is the Roadmaster Comfort Ride Leaf Spring Suspension Kit w/ Shock Absorbers item # RM-2460-2570-3. As far as a disc brake conversion goes, we have options for both 1/2" and 9/16" lug studs so you don't have to change out your wheels. You'll need to take a measurement of your studs to confirm what size you have. With a 7,000 lbs axle and an 8 on 5-1/2 lug pattern you could go either way and that axle...
    view full answer...
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  • Availability of HydraStar Disc Brake Kit w/ Actuator for Triple Axle Trailers With 9/16 Wheel Studs
    Hydrastar offers a version of the # HSE7K-TR1 that features rotors with 9/16 inch wheel studs. We carry the kit as part # HYD54FR. The kit includes: • HydraStar electric-over-hydraulic trailer disc brake actuator • 7K disc brake kit including hub-and-rotor assemblies with bearings, races, and seals • Hydraulic triple-axle brake line kit - (1) 30' Long brake line - 3/16" - (1) 6' Long brake line - 3/16" - (6) 4-1/4" Long brake lines - 3/16" - (6) 18" Male/male rubber flex...
    view full answer...
  • Air Ride and Disc Brake Conversion on a Triple Axle Genesis Vortex 5th Wheel Toy Hauler
    The best way to convert your Genesis Vortex 5th wheel toy hauler to disc brakes is to use the Hydrastar Disc Brake Kit w/ Actuator for Triple Axle Trailers item # HSE7K-TR1. This kit is specifically made for 7,000 lbs axles and has every component you will need to complete your conversion. I have linked an installation video below so you can see the process. To upgrade your toy hauler to an air bag suspension you will want the Lippert Center Point by Trailair Air-Ride Suspension Upgrade...
    view full answer...
  • What is the Difference Between the HSE7K-TRI and HSE7K-TR1SO
    The difference between these two kits is that the # HSE7K-TR1 comes with a complete hub and rotor that replaces your existing hub, where the # HSE7K-TR1SO is only the rotor which slips over your existing hubs. The hub that is included with the # HSE7K-TR1 requires that your current hubs use inner bearing # 25580 and outer bearing # 14125A, so if your hubs have different bearings using the rotor only kit would be the best option. You will want to confirm that you've already got idler hubs...
    view full answer...
  • How To Add Disc Brakes To a High-Tech Marine Triple Axle Trailer
    The HydraStar Disc Brake Kit w/ Actuator for Triple Axle Trailers part # HSE7K-TR1SO is an excellent option to add disc brakes to a triple axle trailer. The 14125A outer bearing tells me you have a 5,200 lb to 7,000 lb axle so the above kit should work just fine. That said, in order to prevent any potential issues with the hub lining up with the rotor, the part # HSE7K-TR1 would be a safer bet.
    view full answer...
  • How To Run Steel and Rubber Lines For Disc Brakes In Trailer
    I understand why it would seem confusing running the steel and rubber lines for disc brakes on your trailer that come in a disc brake kit like part # HSE7K-TR1. The steel lines are the main lines on the trailer and the rubber lines extend to the brake assemblies. I have attached a tandem axle diagram for your reference.
    view full answer...
    Image 1 for
  • Triple Axle Disc Brake Conversion Kit
    The HydraStar Disc Brake Kit item # HSE7K-TR1SO is designed for trailers with 7K axles and an 8 on 6-1/2" bolt pattern. This conversion kit would work great on your 42 1/2 foot travel trailer. If you need new hubs with the brake kit you will want the HydraStar Disc Brake Kit with Actuator for Triple Axle Trailers - 13" Hub/Rotor # HSE7K-TR1. This kit comes with bearings, races, and seals so you won't be needing to purchase those separately.
    view full answer...
  • Determining Which HydraStar Disc Brake Kit Fits 2017 Grand Design Momentum W/ Triple Axles
    I would be happy to help you determine which disc brake kits fits your 2017 Grand Design Momentum M399TH Toy Hauler but you will need to first confirm your bearing combination. The easiest way to do this is by removing one of your current hub assemblies and checking the face of both the inner and outer bearings for a stamped bearing number as shown in the included picture of the # L44649. If your bearings are worn to the point that you cannot read the bearing numbers then you will need...
    view full answer...
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  • Parts to Convert 2017 Grand Design Momentum 376TH to Electric Over Hydraulic Disc Brake
    Thanks for the picture of your axle sticker. From that I can tell that your 2017 Grand Design Momentum 376TH has 7k axles which is exactly what the HydraStar Disc brake kit part # HSE7K-TR1 was designed to fit so it would work great on your trailer and with your 2016 Ford F-350 brake controller that has hydraulic mode.
    view full answer...
    Image 1 for
  • Correct Disc Brake Conversion Kit for 2022 Grand Design Momentum 397THS
    I recommend using the Hydrastar Disc Brake Kit part # HSE7K-TR1 for a 2022 Grand Design Momentum 397THS. This is a complete kit that has everything you need for the swap except brake fluid. It has the hub/rotors, calipers, brackets, lines, actuator, etc. The hub/rotor design also cuts down on extra parts and is easier to install/replace. If you want Kodiak specifically, the Kodiak Disc Brake Kit part # K2HR712D would be correct but you'd need multiple kits and several other parts.
    view full answer...
  • Replacement Brake Pads for Triple Axle Hydrastar Kit
    You can use the Kodiak Ceramic Brake Pads # K250CP-SS to replace the worn pads on your Hydrastar Disc Brake Kit w/ Actuator for Triple Axle Trailers # HSE7K-TR1.
    view full answer...
  • Lippert Center Point and Electric-Over-Hydraulic System for a 2017 Dutchman Voltage 3005
    The closest axle that we have to what you're needing is the Trailer Axle Beam with Easy Grease Spindles # e55GR rated for 5,200 lbs. This has an 89" hub-face measurement and a 74" spring-center measurement which is really close to what you have but slightly off so I recommend having a shop custom-order one for you to make sure it matches up directly. For the Lippert Center Point you need the kit # LC1565401 which is their setup for triple axle trailers (which is what I'm seeing for your...
    view full answer...
  • What Parts are Required to Convert Electric Drum Brakes to Disk Brakes on My Grand Design Toy Hauler
    In order to convert your 2022 Grand Design Momentum 5w toy hauler from drum brakes to disk brakes, it depends on if you have triple 7k axles or tandem 7k axles. For a complete kit for both options, I recommend the following parts: - HydraStar Disc Brake Kit w/ Actuator for Triple Axle Trailers - 13" Hub/Rotor - 8 on 6-1/2 - 7K # HSE7K-TR1 (triple axle) - HydraStar Disc Brake Kit w/ Actuator for Tandem Axle Trailers - 13" Hub/Rotor - 8 on 6-1/2 - 7K # HSE7K-T1 (tandem axle) The great...
    view full answer...
  • Kit to Convert 2021 Vanleigh Pinecrest 335RLP to Electric Over Hydraulic Disc Brakes
    We have a really great kit that comes with everything you'd need to convert your 2021 Vanleigh Pinecrest 335RLP from tandem 6k drum brakes to electric over hydraulic disc brakes with the HydraStar Disc Brake Kit w/ Actuator for Triple Axle Trailers # HSE7K-TR1. This gives you the best braking and actuator components with all brake lines needed as well.
    view full answer...
  • Is Hydrastar Actuator Compatible with Integrated Brake Controller of 2019 Ram 3500
    The integrated brake controller of your 2019 Ram 3500 is compatible with the Hydrastar actuator kit part # HSE7K-TR1 that you referenced. The parts are galvanized which protects from corrosion well. The rotors are made by Kodiak.
    view full answer...
  • Hydraulic Brake Kit For a Ez 4 Kaufman Car Hauler Trailer With 7,000LB Axles
    As your Kaufman 47' EZ 4 Trailer has 7,000lb axles you will need either the Hydrastar Kit # HSE7K-TR1 for 1/2" lug nuts or the Hydrastar Kit # HYD54FR for 9/16" lug nuts. Both kits include new hubs, calipers, bearings, brake lines, the actuator and mounting brackets.
    view full answer...
  • How To Find Correct Disc Brakes for 2018 Jayco Seismic 5W Toy Hauler
    In order to choose the correct disc brake conversion kit for a 2018 Jayco Seismic 5W Toy Hauler, you'll need to know your axle capacity. This can be found easiest on the axle tag which requires crawling under the trailer. I looked up some of the different floorplans and would estimate that you have 7,000 lb axles, in which case the HydraStar Disc Brake Kit w/ Actuator for Triple Axle Trailers part # HSE7K-TR1 is what I recommend for a complete kit. It comes with everything you need; actuator,...
    view full answer...
  • Difference Between HydraStar Disc Brake Kit HSE7K-TR1 & HSE7K-TR1SO for 7K Triple-Axles
    The difference between the two HydraStar Disc Brake Kits with Actuator for Triple Axle Trailers is that one comes with a complete hub-and-rotor assembly while the other is just the slip-on rotors without the hubs. What that means is that if you need new hubs with the brake kit you will want the HydraStar Disc Brake Kit with Actuator for Triple Axle Trailers - 13" Hub/Rotor # HSE7K-TR1. If your hubs are in fine shape and you just want the kit with the slip-on rotors you will want the HydraStar...
    view full answer...
  • Can the HydraStar Disc Brake Kit HSE7K- TR1 Be Converted to Oil Bath?
    I spoke with HydraStar and their Disc Brake Kit w/ Actuator for Triple Axle Trailers # HSE7K-TR1 can be used as oil bath, but they do recommend using standard grease. This is due to when oil bath hubs are left sitting for a while, it will pool at the bottom of the hub. Grease will stay coated on everything and provide better coverage. The problem with these typically being used with grease will be the cap. This will use a cap like the Grease Cap, 2.72" OD Drive In with Plug - Qty 2 # rg04-120...
    view full answer...
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  • Parts to Switch From Electric Drum to Electric-Hydraulic Disc Brakes on 6,000 lb Dexter Triple Axle
    Thank you for all that info, and we do have the exact kit you need to replace the electric drum brakes on your toy hauler with 6,000 lb Dexter axles. The kit that comes with everything you need, including hubs with an 8 on 6-1/2" bolt pattern and 1/2" wheel studs is from HydraStar: - HydraStar Disc Brake Kit with Actuator for Triple Axle Trailers # HSE7K-TR1 The HydraStar # HSE7K-TR1 comes with hub-and-rotor assemblies that fit the spindle of your Dexter 6k axle, an electric-over-hydraulic...
    view full answer...
  • Compatibility of HydraStar HSE7K-TR1 Disc Brake Kit w/ Actuator On 7K Axles
    The HydraStar # HSE7K-TR1 disc brake kit you mentioned is designed for 7K axles. I don't have access to a database that would tell me what your 5th wheel came equipped from the factory with, but it's pretty easy to figure out. The disc brake rotors included in the kit will replace hub/drums that use the 25580 inner and 14125A outer wheel bearing and the GL-2250DL grease seal all of which are typical for a 7K axle. I'd recommend looking at your inner and outer wheel bearings and getting...
    view full answer...
  • What Are The Best Brakes For Triple Axle 5th Wheel Trailer With 7000lb Axles?
    For your triple axle 5th wheel trailer with 7000lb axles I recommend HydraStar Disc Brake Kit w/ Actuator for Triple Axle Trailers - 13" Hub/Rotor - 8 on 6-1/2 - 7K # HSE7K-TR1 as it comes with brakes/hubs, calipers, brake lines, and electric over hydraulic disc brake actuator needed to complete the install. Electric over hydraulic disc brakes are hands down the best option for a heavy trailer like yours and will give you the best braking performance. The only thing you will need is a...
    view full answer...


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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Lindsey S
Edited by:
Lindsey S
Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
Video Edited:
Jacob T
Employee John S
Video Edited:
John S
Employee Kathleen M
Installed by:
Kathleen M
Employee Wilson B
Updated by:
Wilson B
Employee Noah M
Updated by:
Noah M
Employee Manda E
Updated by:
Manda E
Employee Carrie F
Updated by:
Carrie F
Employee Shane H
Test Fit:
Shane H
Employee Jacob H
Test Fit:
Jacob H
Employee Jonathan Y
Video by:
Jonathan Y
Employee Thomas T
Video by:
Thomas T
Employee Rick G
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