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  1. Trailer Brakes
  2. Hydrastar
  3. Disc Brakes
  4. 6000 lbs Axle
  5. Hub and Rotor
  6. 15 Inch Wheel
  7. 16 Inch Wheel
Hydrastar Disc Brake Kit w/ Actuator for Tandem Axle Trailers - 12" Rotor - 6 on 5-1/2 - 6K
Hydrastar

Hydrastar Disc Brake Kit w/ Actuator for Tandem Axle Trailers - 12" Rotor - 6 on 5-1/2 - 6K

Part Number: HYD74VR
In Stock
$1,867.88
Trailer Brakes
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Get 4 rust-resistant hub-rotor assemblies - complete with stainless steel calipers and inner (25580) and outer (15123) bearings - and an electric-over-hydraulic actuator that works with your existing brake controller. Includes lines and fittings. Great Prices for the best trailer brakes from Hydrastar. Hydrastar Disc Brake Kit w/ Actuator for Tandem Axle Trailers - 12" Rotor - 6 on 5-1/2 - 6K part number HYD74VR can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (29)
  • Q & A (0)
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  • Used (1)

Hydrastar Trailer Brakes - HYD74VR

  • Disc Brakes
  • 6000 lbs Axle
  • Hub and Rotor
  • 15 Inch Wheel
  • 16 Inch Wheel
  • Standard Grade
  • 6 on 5-1/2 Inch
  • Hydrastar

Get 4 rust-resistant hub-rotor assemblies - complete with stainless steel calipers and inner (25580) and outer (15123) bearings - and an electric-over-hydraulic actuator that works with your existing brake controller. Includes lines and fittings.


Features:

  • Complete kit upgrades your trailer to disc brakes for better performance
    • Consistent stopping even at highway speeds
    • Shorter stopping distance than drum brakes
  • Stainless steel calipers are rustproof
    • Mounting brackets and hardware included
  • 4 Dacromet-coated disc brake end kits
    • Hub-rotor assemblies include bearings, races, seals, and grease caps
  • Electric-over-hydraulic brake actuator activates the trailer brakes when you apply the brakes in your tow vehicle
    • Installs on trailer frame and connects to trailer's wiring and includes brake lines
    • 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 tandem-axle trailers


Specs:

  • Axle capacity: 6,000 lbs
  • Bolt pattern: 6 on 5-1/2"
  • Rotor diameter: 12"
  • Warranty:
    • Actuator: 2 years
    • Brakes and components: 1 year


Bearings, Race, and Seal Information:

  • Bearings
    • Inner bearing: 25580
    • Outer bearing: 15123
  • Races
    • Inner race: 25520
    • Outer race: 15245
  • Grease seal
    • Inner diameter: 2.25"
    • Outer diameter: 3.376"

Complete Kit Includes:

  • Electric-over-hydraulic trailer brake actuator
  • 6K disc brake kit with hub-and-rotor assemblies, bearings, and grease seals
  • Stainless steel calipers
  • Hydraulic tandem-axle brake line kit
    • (1) 188" Long brake line with 3/8"-24 inverted flare nuts
    • (1) 70" Long brake line with 3/8"-24 inverted flare nuts
    • (2) 21" Male/male rubber flex lines with 3/8"-24 inverted flare nuts
    • (1) 3/8" Brass T-fitting
    • (1) 3/8" Brass union fitting
    • 1/2" Nylon hose clamps
    • 1/4" Nylon hose clamps
    • Self-tapping screws

Disc Brakes are Better Than Drum Brakes

More and more people are switching their trailers over to disc brakes, and with good reason. Unlike drum brakes, disc brakes deliver consistent braking, even at highway speeds. Disc brakes also offer a substantially shorter stopping distance. Disc brake calipers have only one moving part, so there are fewer parts to maintain, fewer parts to get damaged, and fewer parts to have to repair or replace.



E6K-T1SSC Hydra Star Disc Brake Kit with Electric-Over-Hydraulic Actuator for Double Axle Trailers - Stainless Steel Calipers - 12" Diameter Rotor - 6,000-lb Rating

Installation Details HYD74VR Installation instructions


California residents: click here


Customer Satisfaction Score:

Ratings & Reviews

4.6

29 reviews
Get 4 rust-resistant hub-rotor assemblies - complete with stainless steel calipers and inner (25580) and outer (15123) bearings - and an electric-over-hydraulic actuator that works with your existing brake controller. Includes lines and fittings.

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Great setup. Really improved the stopping power of my 36' fifth wheel. Just completed a coast to coast trip. The extra stopping power provided additional safety and peace of mind.



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Installed fairly easily, works great. Stops much faster than the old drum brakes.



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It's been working great for the past year. Wish I had the money to put on all of my trailers.



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The quality of the product was good. Everything went together and function as intended. Thanks



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Thanks for quickly resolving the shipping problem!!



by:

Parts were shipped and received quickly, everything mounted up right and all the hardware needed was included.



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The items seen good quality but the problem is with Hydrastar as a company, calling out customer service, packaging and shipping departments. If it wasn't for great effort from Fred at etrailer I don't thinkl I would try working with this brand again. The packaging was so bad that the rotors ate themselves up. The studs on one rotor scared the other inside the area where the dust cap sits also ruining several studs. The exterior box was in great shape. It was all on Hydrastar. After a week of waiting Fred finally reached someone. I finally received the replacements with the same subpar boxing as before. This time with only minor scratches. Install went well until we opened the actuator box and found a smashed cap. After another two weeks we finished this two month process with success. Don't try this during camping season and not without etrailers help.



by:

Nice quality, fast shipment, and fairly easy installation. The brake line from the actuator to the first axle is quite long. I will go back with a custom line in the future, for now just coiled it up. William S was extremely helpful with my order.



by:

Overall a great kit. Only wish would be to use rubber lined SS adel clamps instead of the supplied plastic ones


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See what our Experts say about this Hydrastar Trailer Brakes

  • Roadmaster Comfort Ride and Disc Brakes for 2026 Alliance Avenue 32RLS
    Hey Greg! The correct Roadmaster Comfort Ride Leaf Spring Suspension Kit for your 2026 Alliance Avenue 32RLS is the # RM49NQ. This includes the shock kit as well. Then for disc brakes I recommend the Hydrastar Disc Brake Kit w/ Actuator for Tandem Axle Trailers # HYD44VR (Dacromet) or # HYD74VR (Dacromet with stainless calipers). This is a complete kit with everything you need to upgrade from electric brakes. Did you just trade in your Imagine for the Alliance Avenue? How are you liking...
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  • What Disc Brake Kit and Roadmaster Comfort Ride do I Need for My 2025 Cougar 320RDS?
    Hello Roy, Looking to swap to disc brakes, you will not be disappointed. Pairing that with the Roadmaster Comfort Ride system makes a huge difference in both braking performance and overall ride quality, especially with a fifth wheel like your Cougar. I do not have a database that supplies us with exactly what is put on each individual camper, but based on my research your 2025 Cougar 320RDS should have a tandem axle setup with each axle rated at 6,000 pounds. You will want to check the...
    view full answer...
  • What Disc Brake Kit do I Want to Convert from Electric to Disc on My 2022 Prime Time Crusader 335RLP
    Hello Clair, Looking to make the swap to disc, always a great idea! I see that you were able to place an order already. Since you have a tandem set-up with each axle rated for 6K, going with the Hydrastar Disc Brake Kit w/ Actuator for Tandem Axle Trailers - 12" Rotor - 6 on 5-1/2 - 6K # HYD74VR is a fantastic choice. Adding the Kodiak Hydraulic Brake Hose - 1/8" ID - DOT Approved - 3/16" Male Fittings - 4' # KD47FR, T-fitting # DE54SR, and 90 degree fitting # DE94SR will ensure you...
    view full answer...
  • What Is The Difference Between The Hydrastar Disc Brake Kits HYD44VR and HYD74VR?
    Good question, Dale! It took me a few minutes of back and forth between the two Hydrastar disc brake kits to figure it out, but the only difference is that # HYD44VR uses all Dacromet coated parts and the # HYD74VR uses mostly Dacromet coated parts, but stainless steal calipers. Other than that, they are exactly the same. I see you ordered the full Dacromet # HYD44VR option and it will work perfectly fine with your 5th wheel. Have you done this kind of install before?
    view full answer...
  • Disc Brake Kit Recommendation for 2022 Grand Design Reflection 337RLS
    Hey Dale, both DeeMax and Hydrastar make really nice disc brake components. Either kit is going to work really well for your 2022 Grand Design Reflection 337RLS. If you want the best of the best and don't mind paying for the premium brand then go with the DeeMax part # DE24NR. If you want basically still the best performance but at a better price the Hydrastar part # HYD44VR is what you want. Like you mentioned for an RV application this would be just fine compared to the stainless steel...
    view full answer...
  • Do the Hydrastar Disc Brake Kits Include Kodiak Brakes?
    Hey Richard! Hydrastar manufactures their own brake calipers and rotors. Kodiak is made by Dexter so the item # HYD74VR kit is not mixed and matched amongst the two companies products. All of the kits use standard ceramic brake pads. The Hydrastar Disc Brake Kit w/ Actuator for Tandem Axle Trailers item # HYD74VR is designed for 6,000 lbs axles. The hubs are 12" and have a 6 on 5-1/2" bolt pattern. I recommend checking your Timber Ridge's bearing sizes before purchasing to confirm fitment....
    view full answer...
  • Roadmaster Comfort Ride and Electric Over Hydraulic for 2019 Grand Design Reflection 311BHS
    Hey John, thanks for all the info on your 2019 Grand Design, Reflection, 311 BHS as that makes it pretty easy to find the correct parts you need. First lets start with the Roadmaster Comfort Ride. Since you have 6k axles the kit you'd want is the part # RM-2460-2570 which comes with the leaf springs and the shocks. Then for a complete kit to convert to electric over hydraulic you would want the Hydrastar part # HYD74VR which comes with everything and the best actuator that is the most...
    view full answer...
  • Do Hub/Rotors of Hydrastar Disc Brake Kit Stick Out Further Than Hub Drums
    Hey Kurt, the hub/rotors that come with the Hydrastar Disc Brake Kit w/ Actuator for Tandem Axle Trailers # HYD74VR that you referenced do not stick out any further than the hub/drums you have now. These also easily fit behind 15 inch wheels as well so this kit will fit well and drastically improve your trailer's stopping power.
    view full answer...
  • Can Hydrastar Actuator Be Exposed To Elements
    Hey Ed! The actuator included with the Hydrastar Disc Brake Kit # HYD74VR can indeed be exposed to the elements if you wanted to mount it outside somewhere on the trailer tongue instead of undercover. The construction consists of weathertight seals that will protect the internal components from nature and the aluminum build will prevent any corrosion over time. One word of caution though is to refrain from using a power washer on it or bringing it through a commercial car wash. Doing...
    view full answer...

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Used Items Available
EtrailerWeb.DataContracts.Swiper.SwiperImageOnlyElement EtrailerWeb.DataContracts.Swiper.SwiperImageOnlyElement
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EtrailerWeb.DataContracts.Swiper.SwiperImageOnlyElement EtrailerWeb.DataContracts.Swiper.SwiperImageOnlyElement

Condition: Badly Dinged

Notes: Item is missing the actuator and the parts are scratched/gouged.

$1,539.80
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Info for this part was:

Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Wilson B
Updated by:
Wilson B
Employee Michael B
Updated by:
Michael B
Employee Jeremy F
Written by:
Jeremy F

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