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This actuator comes primed and ready to weld onto a 50-degree A-frame trailer. The steel housing is heavy-duty, giving it the strength needed for demanding setups, and the primed finish means it’s ready for paint once the welds are done. With a gross towing weight rating of 8,000 lbs and a maximum tongue weight of 800 lbs, it’s built to handle serious loads without flexing or twisting at the tongue.
The 8" adjustable channel-down design gives you flexibility when lining up your coupler. You can mount your coupler attachment (sold separately) in one of three positions, so your trailer sits level behind your tow vehicle. The channel-down setup also lets the coupler sit lower than the actuator tube, which helps level out taller trailers or setups that need extra drop.
The composite master cylinder is made from glass-reinforced nylon that won’t rust or pit, even in rough conditions. It has a large reservoir that holds more brake fluid to cut down on refills, and an automotive-style diaphragm cap that seals out dirt and moisture to help prevent contamination. Inside, an acetal copolymer liner keeps the piston travel smooth every time the actuator telescopes in and out under braking.
A built-in breakaway feature helps stop your trailer if it ever becomes uncoupled from the tow vehicle. The safety cable trips the actuator automatically, activating your brakes and preventing a runaway situation. It’s a simple safeguard that stays ready without needing extra add-on parts or wiring.
This surge-type actuator activates the trailer’s hydraulic drum brakes when the tow vehicle slows down. As momentum pushes the trailer forward, the actuator compresses to apply pressure through the master cylinder, giving you dependable braking without electronics or complicated connections. It’s a clean mechanical setup that just works—every time you hit the brakes.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hello, everybody. This is Jeff at etrailer.com. Today we're gonna take a look at this DEMCO A-Frame eight inch adjustable channel down hydraulic drum break actuator. Has an 8,000 pound gross towing weight capacity, and a nice, prime finish. Now, as we've mentioned, this is designed to fit the 50 degree A-frame trailers. And this is a hydraulic actuator which will activate your trailer's brakes when your tow vehicle slows or stops.
Basically, what happens is when you apply the brakes in your tow vehicle, deceleration will occur, and a momentum will push your trailer toward the rear of your vehicle. And with a surge brake system, this actuator's then triggered as your trailer moves forward once your tow vehicle starts to slow down. And when this happens, the actuator will contract. Basically, this inner slide right here will go into the outer case, and it applies force to the master cylinder in the back here, which in turn, supplies the necessary hydraulic pressure to engage your trailer's brakes. Now, right here they do use an acetal co-polymer lining.
Provides a nice, smooth operation as the actuator telescopes in and out. We mentioned the adjustable channel right here, has three different mounting positions for your coupler. Now, the coupler is not included. We do sell that separately. We did mention, if you look at this channel, it is a channel down design, so it allows for greater drop for tall trailers.
The channel height itself, if we measure it bottom to the top, is eight inches. Inside width, it's gonna be measured inside the inside, is standard three inches. And this is a heavy duty steel construction. Mentioned it has a nice, prime finish for better corrosion resistance. And the master cylinder in the back here, it is a composite master cylinder, which is durable and efficient.
It's a glass reinforced nylon construction so to resist rust and corrosion, and it offers a large reservoir to provide increased capacity for brake fluid. The very top here, you have your standard automotive style diaphragm cap, which will create a completely enclosed system that'll prevent contamination of your brake fluid. Now, right here up at the top, it does include this breakaway cable with the hook and the latch on it. And this is included and it is required by law, because this part here will prevent a trailer runaway situation. So what happens is when you connect your trailer to your tow vehicle, you also take this hook with the latch and hook this to your tow vehicle. So what would happen is, by chance, if your trailer became disconnected from the tow vehicle, it will pull on this cable, which would activate the lever, which again applies the pressure in the master cylinder to apply the brakes on your trailer. So, this does prevent a trailer runaway situation, and as we mentioned, it is required by law. Now, this is a weld-on installation. You can see, as we mentioned, it's designed to be welded or mounted to a 50 degree A-frame trailer. It is made in the USA. Application, we mentioned, is the A-frame trailers with hydraulic drum brakes, gross towing weight capacity of 8,000 pounds, and a maximum tongue rate of 800 pounds. One last note I do wanna mention. If you look on the back here on the brake cylinder, the master cylinder, it does not include a reverse lockout, and that is recommended that you equip your trailer with either a reverse lockout solenoid on the back here or to have free backing brakes on your trailer, so that you could drive in reverse without the actuator triggering your trailer's brakes. But that should do it for the review on this DEMCO A-Frame eight inch adjustable channel down hydraulic drum brake actuator with the 8,000 pound gross towing weight capacity and a prime finish.
Customer Satisfaction Score:
95% were satisfied with this product
5% of customers were not satisfied
Ratings & Reviews
Daniel
7/6/2021
Great product!!! Would reccomend
Alex F.
9/10/2020
12.500 clamshell surge works execellent thks
Info for this part was:
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Rcmedic
8/16/2021
I am very happy. It works great.