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  1. Trailer Brakes
  2. Hydrastar
  3. Disc Brakes
  4. 7000 lbs Axle
  5. Rotor
  6. Marine Grade
Hydrastar Disc Brake Kit w/ Actuator for Triple Axle Trailers - 13" Rotor - 8 on 6-1/2 - 7K

Hydrastar Disc Brake Kit w/ Actuator for Triple Axle Trailers - 13" Rotor - 8 on 6-1/2 - 7K

Item # HSE7K-TR1SO
Our Price: $2,218.40
Trailer Brakes
Shipping Weight: 253 lbs
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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 - 13" Rotor - 8 on 6-1/2 - 7K part number HSE7K-TR1SO can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Hydrastar Trailer Brakes - HSE7K-TR1SO

  • Disc Brakes
  • 7000 lbs Axle
  • 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
      • Slip-on, cast iron, over-the-hub rotors
      • 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


Complete Kit Includes:

  • Hydrastar electric-over-hydraulic trailer brake actuator
  • 7K disc brake kit including over-the-hub rotors
  • 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.


Over-the-Hub Rotors for Easy Replacement

Slip-on, cast iron rotor makes it easy to convert an idler axle to a disc brake axle. Simply place the rotor over your hub. It is most often wheel bolt piloted for a loose fit and then held in place by the wheel itself. With a separate rotor and hub, you can easily repair or replace one element of your brake system without having to junk the whole thing.

The 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. Rotors are vented to effectively dissipate heat, dramatically reducing the incidence of heat-related damage.



E7K-TR1SO Hydra Star Disc Brake Kit w/ Actuator for Triple Axle Trailers - 13" Rotor - 8 on 6-1/2 - 7K





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See what our Experts say about this Hydrastar Trailer Brakes

  • 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...
  • Recommended Disc Brake Kit for a Fuzion 429 Toy Hauler
    In order to choose a disc brake kit for a trailer you'll need to know the axle capacity. The HydraStar Disc Brake Kit part # HSE7K-TR1 is what I recommend for a 7K axle capacity. It comes with everything needed to make the swap and the integrated hub and rotor design helps avoid compatibility issues with selecting the correct hubs. If you have a different axle capacity please just let me know and I'd be glad to see if we have another kit.
    view full answer...
  • How To Switch from Electric Drum to Hydraulic Disc Brakes On a 2017 Grand Design Solitude 374TH
    In order to convert the electric drum brakes on a 2017 Grand Design Solitude 374TH to hydraulic disc I recommend using the HydraStar Disc Brake Kit w/ Actuator for Tandem Axle Trailers part # HSE7K-TR1. This kit comes with absolutely everything you need to make the swap aside from some miscellaneous wiring connectors.
    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...
  • 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...
  • Can etrailer Install Disc Brakes on 2017 Sundowner Toy Hauler
    We could definitely install a disc brake kit like the # HSE7K-TR1 or # HSE7K-TR1SO on your 2017 Sundowner Toy Hauler. Our facility is located in Wentzville, MO so as long as that isn't too far for you we would be happy to do the conversion. If you don't live close then we can still help you out through our network of installers. On each product page there is a "Locate installers near me" link under the installation and review videos. You can also find that same link below on this answer page.
    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...
  • 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
  • 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...
    Image 1 for
  • Hanger Kit to Be Used with Triple Axle Dexter EZ Flex K71-657-00
    Yes the hanger kit part # APTT5 would work well with the Dexter EZ Flex part # K71-657-00 that you mentioned as well. The 3-1/4 inch height of all of the equalizers would work great without any issue.
    view full answer...
  • Electric Over Hydualic Disc Brake Setup for 2020 Grand Design Momentum 376THS
    The HydraStar Disc Brake Kit w/ Actuator for Triple Axle Trailers - 13" Rotor - 8 on 6-1/2 - 7K # HSE7K-TR1SO will work great on your 2020 Grand Design Momentum 376THS with 7k triple axles but this is a slip on kit so you will need idler hubs as well and then you'd be set. For a grease hub you'd just need 6 of the part # 8-231-9UC1-EZ and you'd be set. The Hydrastar rotors will slip right over these hubs.
    view full answer...
  • Correct HydraStar Disc Brake Kit for 50' Kaufman Car Hauler Trailer
    The HydraStar Disc Brake Kit is designed for trailers with 7K axles and an 8 on 6-1/2" bolt pattern so if this is what you have it will work well. That said, if you have hub/drums now you'll also need new idler hubs, the Dexter Trailer Idler Hub Assembly part # 8-231-9UC1-EZ.
    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...
    Image 1 for Image 2 for
  • 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...
  • Parts Needed To Convert To Electric Over Hydraulic Disc Brakes On a 2005 Keystone Raptor Toy Hauler
    Yes, you will be able to update your electric brakes on your 2005 Keystone Raptor 3212DS 5th wheel toy hauler to electric over hydraulic. We do have kits like the Hydrastar Disc Brake Kit # HSE7K-TR1 with 1/2" wheel studs and the Kit # HYD54FR with 9/16" wheel studs. Both kits include an actuator, brake rotors, calipers, and brake lines for a triple axle with a #42 spindle. You will need to verify you have this size spindle on the axles. It will use a Grease Seal # GS-2250DL (ID 2.250"),...
    view full answer...
  • Disc Brakes for 7K Dexter Nev-R-Lube Axles
    For your application you can go with the kit # K71-646-2-91 if you have 5/8" wheel bolts or you can go with the kit # K71-646-2-90 if you have 9/16" wheel bolts. If your current brakes are hydraulic then you need to make sure that the lines and actuator are rated for 1,600 psi. If your current brakes are electric then we need to swap out all of the brake wiring for hydraulic lines and an EOH actuator. Let me know what you have and I can help you figure out what else you may need.
    view full answer...
  • Converting 2016 Diamond C 10k Axle Trailer and Iron Panther 7K Axle Trailer to Disc Brakes
    The D100G axles on your 2016 Diamond C trailer are 10,000 lb axles. Based on the manufacture date you need the Kodiak Disc Brake Kit - 11" Rotor - 8 on 6-1/2 - E-Coat Finish - Leaf Spring - 10,000-lb Dexter # K2R1058D11E which fits the # 008-430-03 hub made after May 2013. If you need hydraulic brake lines I recommend the Hydrastar Hydraulic Brake Line Kit # HS496-252 or # HS496-253. I'm not sure if you have tandem or triple axles so I gave you the option for both. For an actuator and...
    view full answer...

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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
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 Kristina F
Written by:
Kristina F

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