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Review of Demco Brake Actuator - Surge Brake Actuator - DM62VR

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Demco Brake Actuator - Surge Brake Actuator - DM62VR Review


Hello everybody. This is Jeff at etrailer.com. Today, we'll take a look at this Demco hydraulic disc brake actuator to fit a two-inch hitch ball. It has a 7,000-pound weight capacity. Now, this hydraulic actuator 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 occurs and the momentum will push your 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, the bottom portion right here, will contract and apply force to the master cylinder in the back here. This, in turn, supplies the necessary hydraulic pressure to engage your trailer's brakes. This one uses the unique EZ-Latch coupler design. It's pretty nice.

You can see it's low profile. Let me just zoom in so you can get a better look at it, but you can see it doesn't stick up real tall. It's very low profile. Doesn't hook up on anything. But the nice thing about it is it gives you a simple secure hookup and disconnect.

You don't even have to mess with the latch to hook it up. Basically, it's in the closed position like it is now. Just drop this coupler over the hitch ball and the latch will snap into place. Just to show you what we're talking about, I happen to pull a two-inch hitch ball then you'll be able to see here if I lift this up, here's our two-inch hitch ball. When you get your coupler over the ball, with the weight of it, it'll just drop down onto the ball and you notice that pops up and locks it into place and you're all ready to go just like that.

And then when you're ready to disconnect, just pop open the latch and it removes very simple. Put it back down and you're ready to go. So you don't have to mess with it while you're hooking up. Again, drops in, locks into place. Release it just like that. Now, this is a nice heavy-duty steel construction. Has a nice sturdy and reinforced outer casing. It does give the zinc plating on it to give you corrosion resistance. It does meet 120-hour salt spray rating. Now at the very back here, it does use a composite master cylinder which is very durable and efficient. It's a glass-reinforced nylon construction to resist rust and corrosion. Gives you a nice, large reservoir to provide increased capacity for your brake fluid. And if you notice right up here at the top, has this nice automotive-style diaphragm cap that creates a nice completely enclosed system. Helps prevent contamination of your brake fluid. Now this one here, if you noticed and see the wires on it, this one does include an electric reverse lockout on the back of the master cylinder, and that'll let you back up without actuating your trailer brakes. Basically, you wire it into your backup system so your solenoid will activate automatically when you shift into reverse. Also, if you notice, it comes with this breakaway cable and latch hook. It is included and this is required by law. What it does is it prevents a trailer runaway situation. Basically, what you'll do is take this hook with the keeper on it. Connect this to your tow vehicle. And when you do that, what'll happen is if, by chance, this comes disconnected from your tow vehicle, it'll pull on this cable which will activate this lever. And that'll activate the pressure in your master cylinder to apply the brakes. So if it comes disconnected or a metric put on the brakes to keep it from a runaway situation. And again, it is required by law and it is included. Now, this is a bolt-on installation and see the bolt holes down here. It does require a half-inch by 4 1/2-inch long grade-five bolts for mounting. Those are not included. You would have to supply those. This part is made in the USA. Again, the application, this is for trailers with hydraulic disc brakes. The ball sizes fits is a two-inch diameter hitch ball. Gross towing weight capacity is 7,000-pounds. Tongue weight capacity of 700-pounds. And it is designed to mount onto a three-inch wide trailer tongue. And this does go by the model number of DA70. But that should do it for the review on the Demco hydraulic disc brake actuator for two-inch hitch ball. Has a 7,000-pound weight capacity..


Info for this part was:

Employee Jeff D
Installed by:
Jeff D
Employee Ryan G
Installed by:
Ryan G
Employee Joshua S
Video by:
Joshua S
Employee Jacob T
Video Edited:
Jacob T

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