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  1. Trailer Brakes
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  4. 3500 lbs Axle
  5. Rotor
  6. Standard Grade
Hydrastar Disc Brake Kit w/ Actuator for Tandem Axle Trailers - Slip On Rotor - 5 on 4-1/2 - 3.5K
Hydrastar

Hydrastar Disc Brake Kit w/ Actuator for Tandem Axle Trailers - Slip On Rotor - 5 on 4-1/2 - 3.5K

Part Number: HYD72FR
$1,509.28
Trailer Brakes
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Upgrade to disc brakes with 4 rust-resistant slip-on rotors and an electric-over-hydraulic actuator that works with your existing brake controller, and get incredible braking performance. Includes hydraulic lines and fittings. Great Prices for the best trailer brakes from Hydrastar. Hydrastar Disc Brake Kit w/ Actuator for Tandem Axle Trailers - Slip On Rotor - 5 on 4-1/2 - 3.5K part number HYD72FR can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Hydrastar Trailer Brakes - HYD72FR

  • Disc Brakes
  • 3500 lbs Axle
  • Rotor
  • Standard Grade
  • 5 on 4-1/2 Inch
  • Hydrastar
  • 1/2 Inch Studs

Upgrade to disc brakes with 4 rust-resistant slip-on rotors and an electric-over-hydraulic actuator that works with your existing brake controller, and get incredible braking performance. Includes hydraulic 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
  • Over-the-hub, dacromet-coated rotors are easy to install
    • Fit over your standard idler hubs and are held in place by your existing wheel bolts
    • No need to replace entire hub-and-rotor assembly if only hub or rotor becomes damaged
  • 4 Dacromet-coated disc brake end kits
    • Calipers with mounting brackets and hardware
  • 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 included 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: 3,500 lbs
  • Bolt pattern: 5 on 4-1/2"
  • Rotor diameter: 10"
  • Wheel stud diameter: 1/2"
  • 2-Year limited warranty


Bearings, Race, and Seal Information:

  • Bearings
    • Inner bearing: L68149
    • Outer bearing: L44649
  • Races
    • Inner race: L68111
    • Outer race: L44610
  • Grease seal
    • Inner diameter: 1.719"
    • Outer diameter: 2.565"

Complete Kit Includes:

  • Electric-over-hydraulic trailer brake actuator
  • 3.5K disc brake kit with over-the-hub rotors and calipers
  • Hydraulic tandem-axle brake line kit
    • (1) 188" Long brake line with 3/8"-24 inverted flare nuts
    • (1) 76" Long brake line with 3/8"-24 inverted flare nuts
    • (2) 48' Long brake line with 3/8"-24 inverted flare nuts
    • (4) 21" Male/male rubber flex lines with 3/8"-24 inverted flare nuts
    • (1) 3/8" Brass T-fitting
    • (1) 3/8" Brass 4-way fitting
    • (2) 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.


Over-the-Hub Rotors for Easy Replacement

Slip-on, cast iron rotors make it easy to convert an idler axle to a disc brake axle. Simply place the rotor over your hub and use your existing wheel bolts to hold it in place. 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.



E3K-T1SO Hydra Star Disc Brake Kit with Electric-Over-Hydraulic Actuator for Double Axle Trailers - 10" Diameter Over The Hub Rotor - 3,500-lb Rating





Video of Hydrastar Disc Brake Kit w/ Actuator for Tandem Axle Trailers - Slip On Rotor - 5 on 4-1/2 - 3.5K

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Review of Hydrastar Trailer Brakes - Disc Brake Kit Actuator Tandem Axle 3500 LBS - HYD72FR

Hi, everybody, Andy here with etrailer.com. Let's take a look together at this Hydrastar Disc Brake Kit with Actuator for your tandem axle trailers. Now, more and more people are switching their trailers over to disc brakes because unlike drum brakes, disc brakes deliver consistent braking even at highway speeds. Disc brakes are going to also offer a substantially shorter stopping distance, and disc brake calipers only have one moving part, so there are fewer parts to maintain, fewer parts to get damaged, and fewer parts to repair or replace. Now, this kit is designed for your 3,500 pound tandem axle trailer, and this has a 5 on 4 1/2 half inch rather bolt pattern, and the rotor diameter is 10 inches. So, this kit is going to include everything that you see here on my table.

You're going to get these four Dacromet-coated disc brake end kits for two axles and these cast iron over-the-hub rotors are gonna be easy to install. They're gonna fit over your standard idler hubs that are held in place by your existing 1/2 inch wheel studs and lug nuts, so you're not gonna have to worry about replacing your entire hub and rotor assembly if only the hub or rotor becomes damaged. And these also are going to include the inner and outer bearings along with the grease seals that you see here. Now, on your screen I am including the bearing and grease seal information, and if you need to refer back to this information, we do have it listed on this product page as well. Now, these calipers are stainless steel, and let me take this one here and I just want to turn this around here.

So, the calipers are stainless steel and then the brake pads, lift this up here, you can see it right there. And it does include the installation bolts and I'm using the bolts obviously to hold that caliper into place on the caliper mounting bracket. So, these are designed for your four bolt, hopefully you can see that, your four-bolt brake brake flange, so that's going to attach to your four-bolt brake flange. And so these hub and rotors and calipers, the caliper mounting brackets rather that we have right here all have that Dacromet coating which is corrosion-resistant, and as I've been saying, these calipers are stainless steel. So, this kit is going to be ideal for trailers that you're going to be using around water like your boat trailers, and this is also going to include the Hydrastar Electric Over Hydraulic Brake Actuator that will activate your trailer brakes when you apply the brakes in your tow vehicle, triggering the pump and motor on the actuator.

And this is going to install on your trailer frame and connect to your trailer's wiring, and this is going to help create that smooth, even braking, with fast response time, and it does work with most in-cab brake controllers. Of course, the brake controller is sold separately from this kit. You're going to receive the solid brake lines and the flexible lines, and all the fittings that you are going to need for a tandem axle trailer. And we do list each item in detail on this product page if you need the details of the parts that's included with this kit. So, this kit is going to include everything that you need to switch your tandem trailer over to disc brakes for improved performance and greater stopping power.

Well that's gonna wrap up our look today. I do hope that it was helpful for you. Again, my name is Andy, thank you for joining me.

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See what our Experts say about this Hydrastar Trailer Brakes


Info for this part was:

Employee Wilson B
Updated by:
Wilson B
Employee Andy C
Installed by:
Andy C
Employee Jeremy F
Written by:
Jeremy F

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