This actuator bolts right onto a standard 3" straight tongue using 1/2" x 4-1/2" Grade 5 bolts. There’s no welding needed, and the bolt pattern lines up cleanly for quick setup. It’s a solid, heavy-duty steel build that stays tight once mounted, so you can focus on towing instead of adjusting hardware that works loose over time.
With a 12,500 lb gross towing weight and 1,250 lb maximum tongue weight rating, this surge-type actuator brings strong and consistent braking to hydraulic drum setups. When your tow vehicle slows down, the actuator automatically compresses to apply pressure through the master cylinder, delivering steady braking power without needing any electrical hookup.
The composite master cylinder is made from glass-reinforced nylon that won’t rust or corrode like metal cylinders. A large reservoir keeps extra fluid on hand, while the automotive-style diaphragm cap seals it tight to help prevent contamination. The black powder coat finish on the steel housing gives added protection from chips and corrosion, making it a good match for long-term outdoor use.
The built-in 8" adjustable channel gives you three height options for mounting your coupler (sold separately). Whether you’re using a ball coupler, a lunette ring, or a clevis attachment, you can line it up so the trailer sits level behind your tow vehicle. That flexibility makes setup easier and keeps braking performance even across the whole system.
A breakaway feature is built into the actuator to apply the brakes automatically if the trailer ever disconnects during towing. It’s one less add-on to worry about and helps protect both your equipment and anyone else on the road if something unexpected happens.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Today we're gonna take a look at the Demco Hydraulic Drum Brake Actuator with the Eight Inch Adjustable Center Channel and a 12,500 pound Weight Capacity.Now this hydraulic actuator will activate your trailer brakes when your tow vehicle slows or stops. Basically what happens is when you apply the brakes in your tow vehicle, deceleration occurs and the momentum will push the trailer toward the rear of your vehicle.So with the surge brake system, this actuator is triggered as your trailer moves forward, once your tow vehicle starts to slow down. So when this happens, the actuator will contract, which applies force to the master cylinder in the back here, then this in turn supplies the necessary hydraulic pressure to engage your trailer brakes.This actuator on the inside uses an acetal copolymer lining, provides a nice, smooth operation as the actuator telescopes in and out. It's made of a heavy duty steel construction, has a nice black powdered coat finish to help resist corrosion. If you noticed, they do include the breakaway. This is the part here that has the hook on it with the cable.
This breakaway will attach to your vehicle's tow vehicle and in any event if this comes detached from your tow vehicle, it would pull on this cable which would activate the master cylinder and cause the brakes to be applied and prevent a runaway situation.Now the master cylinder they use in this actuator is a composite master cylinder, it's very durable and efficient. It's a glass reinforced, nylon construction, resists rust and corrosion. Up here it has a very large reservoir to provide increased capacity to the brake fluid.The very top here, you can see where you put your brake fluid in. Uses an automotive style diaphragm cap, which creates a completely enclosed system to help prevent contamination of the fluid.On the other end, it has an adjustable center channel. It has three different mounting positions for your coupler that folds in here.
Now, the coupler it goes in here is sold separately. The distance between those holes, center to center, is two inches.This is designed to bolt onto your trailer, it's a bolt on installation. Requires half inch by four and a half inch long grade five bolt for bolting it on. Now the bolts are not included.This part is made in the USA. Again, that application for this is trailers with hydraulic drum brakes, gross towing weight capacity is 12,500 pounds.
Maximum towing weight capacity is 1,250 pounds.The inside channel width, upfront here, is three inches. Channel height, we mentioned, is eight inches. Again, the distance between the holes, center to center, gonna be right at two inches.This is designed to mount on a straight, three inch wide trailer tongue.But that should do it for the review on the Demco Hydraulic Drum Brake Actuator with the Eight Inch Adjustable Center Channel and a 12,500 Pound Weight Capacity.
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Really BIG...Heavy, solid.. seems a bit overkill on my car trailer but it works. Tends to clunk when pulling away from a stoplight..
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Very very very good
These actuators are great. As long as you keep your brakes shoes adjusted also you can't beat it.
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Sturdier than the other brands, easy to bleed brake lines when installing.
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