Made in the USA with a wear-resistant, self-lubricating lining, this surge actuator will work smoothly for years to come. Slide-Lok coupler ensures you'll always have a strong, secure connection. Primed and ready for painting.
Features:
Specs:
If your trailer isn't married to just one tow vehicle, this Demco actuator will be a great option for you. Just keep in mind that because it doesn't have a reverse lockout on it to keep your brakes from activating when you drive in reverse, you will need to have free-backing brakes on your trailer.
Yeah, I think that's on there isn't something you want to say to yourself when you're hauling upwards of 3-1/2 tons because if you're unsure, you'll be constantly checking your side mirrors to make sure the trailer is still tracking behind you. Get a Bulldog-style Slide-Lok coupler and you won't have to second guess yourself again.
To hook up, simply remove the pin and slide the collar back to open up the jaws. Watch your fingers, because this thing is spring-loaded and it will bite you if you're not careful. Then, secure the jaws around your hitch ball and slide the collar up to hold them tightly in place. Replace the pin, give it a tug, and say, yep, that's not goin' anywhere .
You might see the phrase "hard plastic" and think, how durable could that really be? But the truth is, it's tougher than it looks and you'll probably never break it.
Its real name is acetal copolymer. It has a self-lubricating surface. It's extremely resilient, durable, and smooth. And it wears well over time. In fact, this same material can even be found in some automotive applications, making it perfectly suited for a telescoping trailer brake actuator on a utility, livestock, cargo, or construction trailer.
When you slow to a stop as you're towing, momentum pushes your trailer toward the rear of your vehicle. When this happens, the surge brake actuator compresses the master cylinder inside, which forces it to push hydraulic fluid out to your brake lines, ultimately engaging your trailer brakes. When you start moving again, the actuator will telescope back out, stopping the flow of fluid back to the brakes and allowing your trailer's wheels to start rolling again.
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Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hi there, I'm Michael with etrailer.com. Today we're gonna take a quick look at this Demco hydraulic brake actuator. This is a model DA91 surge type hydraulic actuator that's going to activate your trailer's hydraulic drum brakes when your tow vehicle slows or stops. The momentum of the trailer is going to activate to ensure that your hydraulic lines are putting pressure to your drum brakes to make sure that they're applying. This will be a bolt on or a weld on installation. Will install onto a straight three-inch wide trailer tongue.
If you are bolting it on you will require a 1/2 inch by 4-1/2 inch grade five bolts, which are not included as you will have to provide those yourself. But this is constructed here in the USA or it's made here in the USA with a heavy duty steel construction. It's gonna provide a gross towing weight capacity of 7,000 pounds and a maximum tongue weight of 700 pounds. Our bulldog collar lock coupler here is going to fit tightly over a two inch hitch ball for a nice secure connection. We've got the heavy duty design that's going to create a nice fit for your utility, livestock, cargo and construction type trailers.
We have the pin style fastener here that's gonna hold the collar in place around the hinged ball socket there. So when we get connected we can just simply push that forward or when we want to disconnect, we can pull that back. Give you a different perspective on that. So you push in there, just secure it in place and then you can pass your pin through to make sure that it's not going to come disconnected. This does have a composite master cylinder that's gonna be very durable and efficient.
It's constructed of a glass reinforced nylon so it's gonna resist rust and corrosion. You also have a large reservoir that's gonna provide increased capacity for your brake fluid and then an automotive style diaphragm cap here that creates a completely enclosed system to help prevent any contamination of your fluid. We also have acetol copolymer linings that are going to provide a nice smooth operation as the actuator telescopes in and out. This does have a nice primed finish, as you can see. So it is gonna be ready to be painted the color of your choosing.
And of course we do have our breakaway here. This does have the snap hook on the safety cable. That's gonna ensure a nice secure connection to your breakaway. The lever here, if you were to become disconnected at the coupler, this is gonna stay connected and it's gonna pull that lever. Make sure that your trailer's brakes activate so you don't have to deal with a trailer that's propelling itself down the road, bringing it to a nice safe stop. Now because this actuator does not include a reverse lockout, it is recommended that you equip your trailer with free backing brakes so you can drive in reverse without the actuator triggering your trailer brakes because that would essentially cause the unit to telescope in which would apply your brakes. So free backing brakes are a great way to go. So that completes our look for today. Again, I'm Michael with etrailer.com. Thanks for watching.
I ordered a brake actuator for a trailer that we use at my work. The original actuator showed to be available when I purchased it, but actually had been discontinued. A lady, whose name I will not mention, was very helpful and knowledgeable when explaining the situation to me. She offered a replacement to the original one, and even helped me with the cost. The alternatives were a little more expensive. Thank you Diana H. for your expertise and kindness!
My trailer coupler came with instructions. The hydraulic brake actuator coupler came with no instructions. Wish it were the other way around.
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