Tired of inconsistent or weak stopping performance? This Hydrastar disc brake kit gives you the strong, even braking you need with an electric-over-hydraulic actuator that works with most in-cab brake controllers. The setup delivers fast response time and smooth braking, even at highway speeds, giving you confidence every time you tow.
Replacing worn or outdated drum brakes couldn’t be simpler. The 10" over-the-hub rotors slip right over your standard idler hubs and are held in place by your existing wheel bolts—no need to replace the entire hub-and-rotor assembly. The dacromet coating helps resist rust while the cast iron construction meets SAE specifications for strength and durability.
Long trips and heavy loads can push brakes to their limit, but these vented rotors keep heat in check. By circulating air through the core, they dissipate heat more effectively to reduce fade and cut down on heat-related damage. That means more consistent braking performance mile after mile.
Everything needed to convert your tandem-axle trailer is here in one box. The kit includes four dacromet-coated disc brake end kits with calipers and mounting hardware, an electric-over-hydraulic actuator, and a complete line kit with pre-fitted brake lines, fittings, and clamps. It’s designed for 3,500-lb axles with a 5 on 4-1/2" bolt pattern and 1/2" wheel studs, making it a straightforward upgrade to modern braking performance.
With fewer moving parts than drum brakes and corrosion-resistant materials throughout, this system is made for dependable service. The actuator comes with a 2-year warranty, while the brakes and components are covered for 1 year—backing up the quality engineering that goes into every Hydrastar kit.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
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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