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This hydraulic surge actuator is made for serious towing, handling up to 20,000 lbs gross towing weight and 2,000 lbs tongue weight. The heavy-duty steel construction keeps everything solid under pressure, and the weld-on design delivers a permanent, rock-steady mount on a straight 3" trailer tongue. It’s the kind of setup you trust when you’re pulling heavy equipment or farm trailers day in and day out.
Inside the actuator, a rustproof aluminum master cylinder and an acetal copolymer lining work together for smooth telescoping motion every time you brake. The cylinder is built for high-pressure use and moves 50% more displacement than standard master cylinders, so your hydraulic drum brakes get fast, consistent pressure when you need it most. The aluminum body wipes out rust worries and keeps the fluid system clean and efficient over time.
The 8" adjustable channel-up design gives you three different mounting positions so you can line up your coupler exactly where you want it. Whether you’re setting up a standard ball coupler, lunette ring, or clevis (all sold separately), the channel makes it easy to match trailer height for a level pull. Since the coupler mounts above the actuator tube, this setup also gives extra rise—perfect for low trailers or mismatched hitch heights.
The primed surface makes welding straightforward and leaves a clean base for finishing paint once installed. A built-in breakaway system adds another layer of safety by automatically engaging the brakes if the trailer ever disconnects from the tow vehicle. Between its primed body, welded fit, and integrated breakaway protection, this actuator is ready to go to work on heavy trailers that need dependable braking control every mile.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hello, neighbors, it's Brad here from etrailer and today I'm in Boyden, Iowa at the Demco headquarters and manufacturing facility where we got to see Demco products made. And these are all products that I handle on a daily basis when doing flat tows, fifth wheels, or even couplers. They cover so many different towing products and they have plenty of experts here to break down some of their products a little bit more to give you some understanding as well as allow me to ask those questions on products that I handle every day. So, Carter, what do we have here So, this is DA86 brake actuator model. This one is designed for disc brakes. We do also offer for drum brakes, as well, depending on what your trailer actually has on itself.
The nice thing about our actuators, they are all hydraulic-based, so they are all inertia-based. As you back up with the trailer, the brakes are applied as you back up and then going forward, obviously, when you come to a stop, the inertia on the inner slide tube itself will engage this as it's necessary. That will allow the brake fluid inside of the master cylinder reservoir here to go throughout the brakes. Brad So, what's the typical application for this So, this one here, this would be on smaller utility trailers, marine trailers, boat trailers. Obviously, with that as well, the plated finish here, a lot of marine applications will use that to prevent rusting.
That's kind of the main user for this. This is a light duty, so this is actually rated at 8,600 pounds. We do offer anything from 7,000 up to 20,000-pound actuators. So if I'm adding this to a trailer or replacing an old one, what's installation look like Yeah, so this one itself is a standard three-hole application. A lot of OEMs out there, trailer manufacturers out there, will have this standard three-bolt system on it.
We do have weld-on features, as well. A-frame options, definitely depends on what your trailer has as far as the application goes. We do kind of pride ourselves on flexibility with mounting applications, as well. So, it's designed to mount on a standard three-inch tongue, that's kind of industry standard out in the market. Basically, with this one, obviously, you'll have those three bolts that will allow you to take your existing one off, put this one on and away you go.
This red tab is catching my attention. I'm assuming that this is a lockout It is, you are correct, yes. So, most disc brake actuators will come standard with an electric lockout on the backside. Usually you have either a bypass solenoid or an inline solenoid that will just have two wires connecting to it. One's a power, one is a ground source. If there is a case where the ground is not proper, the solenoid isn't functioning like it's designed to, this is where this manual lockout comes into play. The nice thing with that, basically, all you would have to do in a standard situation, it would be down like that, flip the tab up. As soon as you back up, that does not allow for this inner slide tube to move in and apply those brakes. And then as soon as you pull forward with this, this tab would actually fall out of the way, that'll allow you to go in a normal state. Brad So, a nice little backup plan in case electronics aren't working, which I can imagine marine applications is probably one of those Right, yes, absolutely. So, obviously you wanna get your boat in the water. Best way to do that is to, obviously, backup with that. You don't wanna have the brakes apply when you do that. Obviously, it is a frustrating situation when the solenoid isn't working like it's designed to. So that's definitely a nice feature that that manual lockout comes into play. We got to see this manufactured today. Family-owned company here in Iowa, made in the US, so a great product. Carter, thank you for taking the time to show us your surge actuator. Yeah, thanks for stopping over. Appreciate it.
Ratings & Reviews

Victoria H.
11/19/2024
Hi Holger, this should've been packaged better. Let me make this right for you.
Info for this part was:
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Jeff M.
9/3/2025
No problems works as it should