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The Bulldog Collar-Lok coupler on this actuator locks down tight around a 2-5/16" hitch ball for a solid, rattle-free connection. The heavy-duty pin-style latch keeps the collar in place, so you get a strong, dependable link for up to 8,000 lbs of gross towing weight and 800 lbs of tongue weight. It’s built for trailers that see real use—utility, livestock, cargo, or construction—and holds steady when you’re hauling over rough ground or stopping hard.
Inside the actuator, the glass-reinforced nylon master cylinder is built to handle years of use without rusting or pitting. The large reservoir carries more brake fluid so you don’t run low on long hauls. An automotive-style diaphragm cap seals the system to keep moisture and debris out. Together, these features keep your hydraulic drum brakes working smoothly whenever the tow vehicle slows or stops.
The actuator telescopes in and out with an acetal copolymer liner that keeps movement smooth and consistent every time you brake. A built-in breakaway system is included for extra safety—if the trailer separates, it automatically engages the brakes to bring everything to a stop.
This model comes primed and ready for weld-on installation on a 50-degree A-frame trailer tongue. The straight-tube housing gives you a clean surface to weld to, and once it’s mounted, you can prime or paint it to match your trailer. The finished setup looks clean and stays protected from the elements.
At its widest point this actuator measures 17 inches, with a total length of 30 inches—compact enough to fit neatly on most A-frame tongues while still giving you full travel for effective braking force.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hello, neighbors and friends. Welcome back. I'm Steven. This is gonna be a look at our Demco hydraulic brake actuator for drum brakes. It's got a prime finish, and it's what they consider an A-frame style coupler. So again, it's a hydraulic actuator, and that's gonna activate your trailer's brakes when your tow vehicle slows or stops.
It's got what's called a bulldog style or collar lock style coupler. It's gonna fit tightly around the hitch ball for a secure connection. And as far as that goes, if you've never seen one of these, I'll go ahead and pull a ball out from around the table here and show you a simple demonstration. Simply pull the pin out. Now, this collar is spring-loaded, so when I pull that, this other latch here will pop open.
You can kind of see it there, and the ball simply goes up in place. And then once you get that 2 and 5/16th ball on there, you just simply push that close, and it's gonna automatically lock in place. And I'll kind of spin that around there, show you that a little better maybe. And then as far as getting the ball unhooked, obviously, this will be on your ball mount, once you've got that collar and pull it back, it's gonna automatically open, thus releasing from the ball itself. Now I'm gonna go ahead and close this back up here and put the pin back.
Very simple operation, very easy to use. Now, taking a closer look, again, I talked about that pin holder, that's gonna hold that collar in place and keep it from opening when you don't want it to. That's got a nice, large reservoir back here. That's gonna provide increased capacity for your brake fluid. There's a back view of that whole assembly.
And it's got a nice glass-reinforced nylon construction. That's gonna resist rust and corrosion. It's got this nice automotive style diaphragm cap. That's gonna create a completely enclosed system, and that's gonna help prevent contamination of your fluid. It's got a nice rubber seal on there. Now, as far as this guy sliding in and out and actuating whenever you're using it, 'cause if you don't know, when you hit your brakes on this style of brake actuator coupler, this piece will kinda compress inside of here, and thus pushing the fluid to those drum brakes. Now, it has what's called an acetal coal polymer lining on here, and that's gonna give you a nice, smooth operation as the actuator telescopes in and out from this assembly. Again, the breakaway cable is included. It's got a nice reach on it there. I'm even outta the view over here, that's how long it is. It's got a nice safety cable chain hookup here. Put that on the same spot where you put your safety chains for the trailer. God forbid you have a brake bleed, but if do, basically that's gonna pull this latch, which will then automatically send the fluid to the brakes, locking 'em up to stop you safely. That's a simple reset, you just push it back in place when everything's fixed and ready to go, and it's ready to go again. It is a nice heavy duty, nice, steel construction. Beautiful polished prime finish rather here. It looks kinda polished, it's shiny, but it's a prime finish, you can paint it whatever color you want. It's a weld-on application, so you would weld this onto your trailer frame. It's a straight tube up here. Again, A-frame shaped down below. It is made in the USA. It's got what's considered a 50 degrees A-frame. And again, it works with hydraulic drum brakes. It has a nice one-year warranty. And if you're matching up models, it is considered a model D95050. It is rated 8,000 pounds capacity and 800 pounds tongue weight. All that is also stamped on top of the coupler head over here, which you can't see right now 'cause of the angle, but it's all stamped on there as well. So a very nice product. Demco makes really nice couplers and actuators, and they're kinda well-known in the trailer scene. Well, again, I'm Steven with etrailer.com. Hope all this information's been helpful for you. I hope if you're making a decision to go from electric to hydraulic brakes, keep in mind, you do have to get all your brake lines, the brake drums, all that kinda stuff, and you can find all that information as well on etrailer.com. Stay safe out there as always, have fun installing, and I'm Steven, have a great day.
Customer Satisfaction Score:
95% were satisfied with this product
5% of customers were not satisfied
Ratings & Reviews
Perfect , the delivery was faster than expected. The product is real good quality.
Thanks for your great service.
Regards,
Marcel
perfect! its exactly what i needed.
Extremely happy with service and product. Thank You!
Good product for a reasonable price. Product availability and service was excellent.
Excellent product. Exact product as shown. Quality materials. Quick to ship and receive.
Super replacement and much cheaper than the bulldog style.
The people at E-trailer were very helpful and the product that came was exactly what i needed.
Needed this for a water trailer. Couldn’t find one locally. Ordered and received very quickly. Item was as pictured and looks like it should work great!
Very happy with my purchase. It was a good price, easy to order and was received in short time. Thank you!
Very good product. I have been a fabricator for 42 years, and I will say this is very well made. etrailer.com is a great place!
Have not installed yet, but the product appears to be of high quality and heavy weight steel. Looks great.. would reccomend to anyone!
Really pleased on the outcome. I did have to paint where I had to weld. Would be nice to have the color to match the metal.
Amazing upgrade from magnetic brakes! Brittany was friendly, prompt, knowledgeable.
Very impressed! This will be perfect for my trailer rebuild.
Thanks for your help in these trying times. I am restoring the surge brake operations to a 1985 Wells cargo enclosed trailer and performing all of the work myself. Not an easy task on a 36 year old trailer purchased new. I received this part and it is fantastic and arrived many days ahead of the projected delivery date. My prior orders also arrived early and the trailer brake parts and lines fit perfectly. Thank you for providing the service and knowledge to get me what I needed to restore an obsolete trailer. I can provide photos on completion. I may need to order new parts again in 36 years, I will be 94.
Yes i recieved the device , I'ts better than i expexted , very well built , Can definetely handle more weight than designed for, P/S I invented the device about 45 years ago. The device takes the shifting weight away from the hitch and tong of the trailer. The first device used a coil spring, The device i recieved uses a shock works the same as a coil spring.
excellent!. I painted with the trailer color
You did a great job and we received it very quickly. Thank you.
this hitch was by far beyound my expections they will get most of my business
far superior to what it is replacing. well constructed, fast shipping.
Thanks again for supplies a quality product keep it up!
Product has met my expectations. The customer service at etrailer is fantastic.
The product was just what I expected. The real story was that etrailer had a delay in shipping due to a manufacturer issue. Etrailer stayed in constant contact with me and made sure I was up to date on every stage of the order. AAA+ service...!!!
Awesome unit, but did not come with installation or system bleed instructions.
The weld on installation matched the trailer tongue angle perfectly and is a very rugged build. I connected the hydraulic line to the original brake tubing, bled the brake fluid through the system using pressure with the break away lever and put the trailer back to work. The braking power is smooth and consistent. The only trouble is when I back the trailer up an incline. I would purchase the backing option lever so you don’t have the trouble backing the trailer putting on the brakes.
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Alex F.
9/10/2020
12.500 clamshell surge works execellent thks