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Hydrastar

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

Part Number: HYD44VR

37 Reviews | 18 Questions

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Product Images

hydrastar trailer brakes disc standard grade

hydrastar trailer brakes hub and rotor 6000 lbs axle hyd44vr

hydrastar trailer brakes standard grade 6000 lbs axle hyd44vr

hydrastar trailer brakes disc hub and rotor brake kit w/ actuator for tandem axle trailers - 12 inch 6 on 5-1/2 6k

hydrastar trailer brakes disc 6000 lbs axle

hydrastar trailer brakes disc standard grade brake kit w/ actuator for tandem axle trailers - 12 inch rotor 6 on 5-1/2 6k

hydrastar trailer brakes standard grade hub and rotor hyd44vr

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In Use/Installed

2021 keystone cougar fifth wheel trailer brakes hydrastar standard grade 6000 lbs axle hyd44vr

2021 keystone cougar fifth wheel trailer brakes hydrastar disc hub and rotor brake kit w/ actuator for tandem axle trailers - 12 inch 6 on 5-1/2 6k

2021 keystone cougar fifth wheel trailer brakes hydrastar standard grade hub and rotor hyd44vr

2021 keystone cougar fifth wheel trailer brakes hydrastar disc 6000 lbs axle on a vehicle

2021 keystone cougar fifth wheel trailer brakes hydrastar standard grade hub and rotor on a vehicle

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Videos

Hydrastar Disc Brake Kit Install Guide - 2021 Keystone Cougar Fifth Wheel

Review of Hydrastar Trailer Brakes - Tandem Axle Disc Brakes - HYD44VR

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SCHEDULE AN INSTALLATION

Get 4 rust-resistant hub-rotor assemblies - complete with 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 HYD44VR can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.

Hydrastar Trailer Brakes - HYD44VR

Highlights

Upgrade to Safer Stops: Disc brakes deliver consistent, shorter stopping distances than drums.
Plug Into Your Controller: Electric-over-hydraulic actuator works with most in-cab brake controllers.
Ready to Mount Kit: Includes hub-rotor assemblies, bearings, seals, calipers, and all brake lines.
Built for 6,000-lb Axles: 12" rotors with 6 on 5-1/2" bolt pattern pair with 15"–16" wheels.
Resists Rust and Wear: Dacromet-coated hub-rotors stand up to moisture and road salt.
Smooth, Even Braking: Fast hydraulic response creates steady braking at highway speeds.

Features to know about

Upgrade Old or Dragging Brakes: Complete Disc Kit for 6,000-lb Axles

If your drum brakes are worn or not stopping as they should, this Hydrastar kit gives you a full electric-over-hydraulic disc brake setup. Each 12" Dacromet-coated hub-rotor assembly includes the inner (25580) and outer (15123) bearings along with the races, seals, and grease caps. The actuator ties right into your existing brake controller for smooth, even braking that’s consistent even at highway speeds.

Boost Stopping Confidence on Heavy Loads: Electric-Over-Hydraulic Actuator

Hauling weight down long grades takes solid braking power. The included actuator activates the trailer brakes the instant you press the pedal in your tow vehicle, giving fast response and shorter stopping distances than drum brakes. You get the same controlled feel as a truck brake system, with no lag or uneven grab.

Tackle Install Without the Hassle: Everything Needed for a Tandem Axle Setup

This kit comes ready to bolt on with all the lines and fittings for a tandem-axle trailer. It includes 188", 76", and 48" steel brake lines plus four 21" flexible rubber lines and all brass fittings, clamps, and self-tapping screws. It’s built so you can lay it out cleanly on your frame without hunting for extra parts.

Built for Real-World Conditions: Rust-Resistant Dacromet Coating

Road spray and salt can destroy uncoated rotors fast. The four Dacromet-coated disc brake end kits resist corrosion to keep braking consistent over time. With fewer moving parts than drum brakes and coated hardware throughout, there’s less upkeep and fewer replacements down the road.

Engineered for Fit and Strength: 6 on 5-1/2" Bolt Pattern with Hub-and-Rotor Design

Each hub is designed for 6,000-lb axles and uses a standard 6 on 5-1/2" bolt pattern that fits common wheel sizes. The integrated hub-and-rotor design keeps everything aligned for smoother rotation and balanced braking. It’s a solid upgrade that delivers consistent performance season after season.

Specs

Weight and Capacity

Axle capacity: 6,000 lbs

Dimensions

Rotor diameter: 12"

Bolt Pattern

Bolt pattern: 6 on 5-1/2"

Wheel Studs

Diameter: 1/2"

Actuator PSI

1,600 PSI

Warranty

Actuator: 2 years
Brakes and components: 1 year

Bearings, Race, and Seal Information

Inner bearing: 25580
Outer bearing: 15123
Inner race: 25520
Outer race: 15245
Grease seal inner diameter: 2.25"
Grease seal outer diameter: 3.376"

E6K-T1 Hydra Star Disc Brake Kit with Electric-Over-Hydraulic Actuator for Double Axle Trailers - 12" Diameter Rotor - 6,000-lb Rating

Customer Satisfaction Score:

88% were satisfied with this product

12% of customers were not satisfied

Product did not meet expectations
Wrong item was ordered
etrailer mistake

12% of customers were not satisfied

Product did not meet expectations
Wrong item was ordered
etrailer mistake

4.6

37 reviews

5 Stars		(27)
4 Stars		(8)
3 Stars		(0)
2 Stars		(0)
1 Star		(2)

by: Russell 10/08/2026 One Year Later

I’m not 100% satisfied with the Hydrostar disc brake actuator. At 10mph when I squeeze the brake controller the system does not immediately stop the camper. It seems that the trailer brakes work better at higher speeds.

by: Alan G 03/26/2026

The manual is pretty bad, mostly because of the wiring diagram. FORTUNATELY, the assistance from etrailer and all the install videos are very helpful!
BUT, there is a need for some videos on installing all of this on a Travel Trailer. Mine is big and heavy, hence needing this kit to start with. Wiring the actuator has been a headache and a challenge because of bad diagrams, manuals and the unique layout of a Travel Trailer vs 5th wheel. The brake parts came in good shape and are of good quality. Yes, the brake parts are hefty and need better packaging from the manufacturer. Fortunately, all arrived successfully in the end.

by: Dave 05/09/2026

Great product...fast shipping

by: David 08/29/2025

Products just arrived yesterday, even though i requested packaging to be better (saw poor review comments on this before hand), it arrived in 2 large boxes that were battered to hell and opened up with contents exposed. Much to my surprise, it appears all parts are present and undamaged, going to install over weekend and will follow up with after install evaluation.

by: Bryan 02/08/2026

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.

Mike L.

2/9/2026

Sorry about the difficulties you ran into there Bryan, but I'm glad we could help!!

by: Ed 11/30/2024

Thanks for quickly resolving the shipping problem!!

by: Joel 02/10/2025

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

by: David 05/13/2026

by: Michael 05/21/2025

by: Ross 09/04/2026

by: David 02/08/2025

by: Steve 01/23/2025

by: Terry 05/07/2025

2017 GMC Sierra 2500

by: Jerry 09/13/2026

Braking is now excellent and everything included for install fit perfect. Thanks for helping me select correct kit as I wanted to convert to oil bearings as well.

by: Tom 10/04/2026

Happy with what I have received and my interaction with etrailer personel. Packaging could have been a little better to eliminate freight handling damage but all arrived and is now being installed. While the package is mostly complete, one glaring omission is the 16ea. Bolts to mount the caliper bracket to the axle flange. The Dexter backing plate bolts I am removing with the existing electric drum brakes will not work for the conversion. This should be pointed out on their web page for us diy’ers.

by: Robert 07/07/2026 One Year Later

Lauren is the best.

by: Wilbur 07/03/2026

looks great,not done yet.

by: Bobby 12/05/2025

Prices, promptness of shipping and delivery, and customer service is the best I have ever done business with.

by: Daniel 05/14/2025

Chevrolet SS

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

by: HJ 10/27/2024

2019 Grand Design Solitude Fifth Wheel

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: Robert 06/12/2024 One Year Later

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

by: Dennis 07/06/2022 One Year Later

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.

by: Jim 04/24/2025 One Year Later

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

by: Paul 10/26/2024 One Year Later

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

by: William 01/07/2026 One Year Later

true

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Hey Chris, welcome back! The Hydrastar Disc Brake Kit w/ Actuator for Tandem Axle Trailers item # HYD44VR is exactly what you need for your 6,000 lbs axles with 6 lug hubs. This kit includes four rotors, an actuator, and all the brake lines you'll need to convert your Keystone Cougar over to disc brakes. When say everything but the oil, are you looking to set these hubs up for oil lubrication? The item # HYD44VR kit is intended for grease lube applications only. You'll need two of the...
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Will Hydrastar Disc Brake Kit HYD44VR Fit Tandem Axle Trailer with 6k Axles
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Condition: Surface Scratches

Notes: Item has cosmetic scratches. Otherwise new and unused.

$1,565.15

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Info for this part was:

Installed by:

Jeff D

Expert Research:

Jameson C

Updated by:

Wilson B

Video Edited:

John S

Video by:

Thomas T

Test Fit:

Bradley B

Written by:

Jeremy F

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