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  1. Brake Actuator
  2. Demco
  3. Surge Brake Actuator
  4. Drum Brakes
  5. Channel
  6. 20000 lbs GTW
Demco Unassembled Hydraulic Brake Actuator - Drum - Primed - 12" Adjustable Channel Down - 20K
Demco

Demco Unassembled Hydraulic Brake Actuator - Drum - Primed - 12" Adjustable Channel Down - 20K

Part Number: DM5947
In Stock
$393.20
Retail:$570.22
You Save: $177.02
Brake Actuator
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Surge-type actuator comes unassembled and primed. Features a durable composite master cylinder. Adjustable down channel lets you mount different coupler attachments (sold separately) in 1 of 5 positions. Includes breakaway. 1-800-940-8924 to order Demco brake actuator part number DM5947 or order online at etrailer.com. Free expert support on all Demco products. Great prices and Fastest Shipping for Demco Unassembled Hydraulic Brake Actuator - Drum - Primed - 12" Adjustable Channel Down - 20K. Brake Actuator reviews from real customers.
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  • Reviews (3)
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  • Videos (2)
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Demco Brake Actuator - DM5947

Highlights

  • Heavy-Duty Stopping Power: Handles up to 20,000 lbs GTW for large or loaded trailers.
  • Paint-Ready and Weld-On: Comes primed and unassembled for easy welding and color matching.
  • Smooth Hydraulic Braking: Surge design automatically applies drum brakes as you slow down.
  • Built-In Safety Backup: Breakaway lever engages brakes if the trailer disconnects.
  • Corrosion-Resistant Build: Composite master cylinder and nylon lining resist rust and wear.
  • Adjustable Channel Flexibility: Five height positions fit different couplers for level towing.
Made in USA

Features to know about

Unassembled and Primed: Ready for Welding and Custom Finishing

This actuator comes unassembled and primed, so it’s ready to weld without having to take anything apart first. Since the internal components aren’t installed yet, there’s no risk of heat damage during welding. Once it’s mounted, you can paint it to match your trailer. The setup is clean and straightforward, with no extra disassembly or lost parts to worry about.

Versatile Fit: 12" Adjustable Channel with 5 Mounting Positions

The 12" adjustable channel lets you mount different coupler types (sold separately) in one of five positions, giving you flexibility to line everything up just right. The channel-down design provides a greater drop, which helps keep tall trailers level when towing. Whether it’s a standard ball coupler, lunette ring, or clevis attachment, the channel layout makes it easy to match your setup.

Reliable Braking: Composite Master Cylinder with Large Reservoir

The composite master cylinder is made from glass-reinforced nylon that resists rust and corrosion. It has a large reservoir for more brake fluid capacity and an automotive-style diaphragm cap that seals out contaminants. Together, these details help maintain smooth hydraulic pressure and consistent braking with less chance of fluid issues over time.

Built-In Safety: Integrated Breakaway System

A built-in breakaway lever and safety cable with snap hook are included to stop your trailer if it ever disconnects. The lever automatically activates the brakes when pulled, so the trailer won’t roll away uncontrolled. Inside, an acetal copolymer liner keeps the telescoping action smooth for dependable operation in every situation.

Heavy-Duty Construction: Designed for 20,000 lbs GTW Applications

Made from heavy-duty steel and built for weld-on installation on a straight 3" wide trailer tongue, this actuator is rated for 20,000 lbs gross towing weight and 2,000 lbs maximum tongue weight. It’s built to handle demanding jobs on trailers equipped with hydraulic drum brakes while maintaining long-term durability and performance.

Specs

Application

  • Application: trailers with hydraulic drum brakes

Weight and Capacity

  • Gross towing weight: 20,000 lbs
  • Maximum tongue weight: 2,000 lbs

Dimensions

  • Channel width: approximately 3"
  • Channel height: 12"

Mounting

  • Mounting: straight, 3" wide trailer tongue

Model

  • Model number: DA20

Warranty

  • 1-Year warranty

Note

  • Note: Because this actuator does not include a reverse lockout, it is recommended that you equip your trailer with free-backing brakes so that you can drive in reverse without the actuator triggering your trailer's brakes.

5947 Demco Hydraulic Brake Unassembled Actuator - Drum - Primed - 12" Adjustable Channel Down - 20K

Installation Details DM5947 Installation instructions



Video of Demco Unassembled Hydraulic Brake Actuator - Drum - Primed - 12" Adjustable Channel Down - 20K
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Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Built to Launch, Built to Last: Demco Breaks Down Their Surge Brake Actuators

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.

Customer Satisfaction Score:

Ratings & Reviews

4.0

3 reviews
Review sort icon
Surge-type actuator comes unassembled and primed. Features a durable composite master cylinder. Adjustable down channel lets you mount different coupler attachments (sold separately) in 1 of 5 positions. Includes breakaway.

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Overall, the product works well. I would advise to keep tung height above level for extremely heavy loads. Otherwise, you may experience a delay in release of the brake. So far it's been a better than the Titan equivalent, partially because this system requires no grease.


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See what our Experts say about this Demco Brake Actuator


Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Dustin K
Video Edited:
Dustin K
Employee Wilson B
Updated by:
Wilson B
Employee Amanda M
Written by:
Amanda M

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