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  1. Trailer Brakes
  2. Hydrastar
  3. Disc Brakes
  4. 7000 lbs Axle
  5. Hub and Rotor
  6. 16 Inch Wheel
  7. 16-1/2 Inch Wheel
Hydrastar Oil Bath Disc Brake Kit w/ Actuator - Tandem Axle - 13" Hub/Rotor - 8 on 6-1/2 - 7K
Hydrastar

Hydrastar Oil Bath Disc Brake Kit w/ Actuator - Tandem Axle - 13" Hub/Rotor - 8 on 6-1/2 - 7K

Part Number: HYD27VR
$2,500.00
Trailer Brakes
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Before you hit the road, grab this one-kit upgrade for tandem axle brakes. It includes hub-rotor assemblies with bearings, races, seals, and caps, calipers with brackets, an electric-over-hydraulic actuator, and a tandem-axle line kit with fittings. Great Prices for the best trailer brakes from Hydrastar. Hydrastar Oil Bath Disc Brake Kit w/ Actuator - Tandem Axle - 13" Hub/Rotor - 8 on 6-1/2 - 7K part number HYD27VR can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
  • All Info
  • Reviews (23)
  • Q & A (0)

Hydrastar Trailer Brakes - HYD27VR

  • Disc Brakes
  • 7000 lbs Axle
  • Hub and Rotor
  • 16 Inch Wheel
  • 16-1/2 Inch Wheel
  • Standard Grade
  • 8 on 6-1/2 Inch
  • Hydrastar
  • 9/16 Inch Studs

Before you hit the road, grab this one-kit upgrade for tandem axle brakes. It includes hub-rotor assemblies with bearings, races, seals, and caps, calipers with brackets, an electric-over-hydraulic actuator, and a tandem-axle line kit with fittings.


Highlights

  • Shorter, More Consistent Stops: Disc brakes keep braking power at highway speeds.
  • Complete Conversion In One Box: Hubs and rotors with bearings and seals, calipers and brackets, actuator, and tandem line kit.
  • Oil Level At A Glance: Oil bath hub/rotors let you verify level before a trip.
  • Quick Actuator Response: Hydrastar electric-over-hydraulic works with most in-cab controllers.
  • Built For 7K Tandems: 8 on 6-1/2 pattern with 9/16" studs fits common 16" and 16-1/2" wheels.
  • Plumbing For Tandem Axles: Hard lines, flex lines, fittings, and clamps included.

Features to know about

Why Disc Brakes On A Trailer

Disc brakes maintain braking torque at highway speeds, which helps shorten stopping distance compared with drums. Calipers use fewer moving parts than drum assemblies, so there is less to service and fewer parts to damage.

Why An Integral Hub And Rotor Matters

The cast iron hub-and-rotor handles heat and keeps friction consistent. Machined mating surfaces reduce contamination between hub and rotor, which helps braking stay smooth and extends service life.

Specs

Specs:

  • Axle capacity: 7,000 lbs
  • Bolt pattern: 8 on 6-1/2
  • Rotor diameter: 13"
  • Wheel stud diameter: 9/16"
  • Warranty:
    • Actuator: 2 years
    • Brakes and components: 1 year

Bearings, Race, and Seal Information:

  • Bearings:
    • inner bearing: 25580
    • outer bearing: 14125A
  • Races:
    • inner race: 25520
    • outer race: 14276
  • Oil seal: HYD27FR
    • 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 tandem-axle brake line kit
  • (1) 15' long brake line with 3/8"-24 inverted flare nuts
  • (1) 6' long brake line with 3/8"-24 inverted flare nuts
  • (2) 4-1/4' long brake lines with 3/8"-24 inverted flare nuts
  • (4) 18" male/male rubber flex lines
  • (1) 3/16" brass T-fitting
  • (2) 3/16" brass union fittings
  • (1) 3/16" brass X-fitting
  • 1/2" nylon hose clamps
  • 3/16" nylon hose clamps
  • Self-tapping screws


E7K-T9-OB Hydrastar Oil Bath Disc Brake Kit w/ Actuator - Tandem Axle - 13" Hub/Rotor - 8 on 6-1/2 - 7K





Ratings & Reviews

4.8

23 reviews
Before you hit the road, grab this one-kit upgrade for tandem axle brakes. It includes hub-rotor assemblies with bearings, races, seals, and caps, calipers with brackets, an electric-over-hydraulic actuator, and a tandem-axle line kit with 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!!



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



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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.



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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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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.



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


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See what our Experts say about this Hydrastar Trailer Brakes


Info for this part was:

Employee Daron K
Edited by:
Daron K
Employee Dawn Z
Written by:
Dawn Z
Employee Kim H
Updated by:
Kim H

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