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  1. Brake Actuator
  2. Demco
  3. Surge Brake Actuator
  4. Drum Brakes
  5. 2 Inch Ball Coupler
  6. Bolt-On
Demco Hydraulic Brake Actuator - Drum - Zinc - 2" Ball - 7,000 lbs

Demco Hydraulic Brake Actuator - Drum - Zinc - 2" Ball - 7,000 lbs

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Brake Actuator
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Shipping Weight: 20 lbs
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Surge-type actuator features a corrosion-resistant composite master cylinder and durable zinc plating with a 120-hour salt spray rating. EZ-Latch coupler mechanism makes hookup a snap. Bolt-on application. 1-800-940-8924 to order Demco brake actuator part number DM72VR or order online at Free expert support on all Demco products. Guaranteed Lowest Price and Fastest Shipping for Demco Hydraulic Brake Actuator - Drum - Zinc - 2" Ball - 7,000 lbs. Brake Actuator reviews from real customers.
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  • Reviews (58)
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Demco Brake Actuator

  • Surge Brake Actuator
  • Drum Brakes
  • 2 Inch Ball Coupler
  • Bolt-On
  • 7000 lbs GTW
  • No Lockout
  • Straight Tongue Coupler
  • Demco

Surge-type actuator features a corrosion-resistant composite master cylinder and durable zinc plating with a 120-hour salt spray rating. EZ-Latch coupler mechanism makes hookup a snap. Bolt-on application.


  • Hydraulic actuator activates trailer's brakes when tow vehicle slows or stops
  • EZ-Latch coupler mechanism for simple, secure hookup and disconnect
    • Lets you hook up when latch is in closed position - just drop coupler over hitch ball and latch will snap into place
  • Zinc plating offers corrosion resistance
    • 120-Hour salt spray rating
  • Composite master cylinder is durable and efficient
    • Glass-reinforced nylon construction resists rust and corrosion
    • Large reservoir provides increased capacity for brake fluid
    • Automotive-style diaphragm cap creates completely enclosed system to help prevent contamination of fluid
  • Large rear rollers allow for easy movement and smooth operation
  • Breakaway included
    • Snap hook on safety cable ensures secure connection to breakaway lever
  • Heavy-duty steel construction with sturdy, reinforced outer casing
  • Bolt-on installation
    • Requires 2-1/2" x 4-1/2" Grade-5 bolts (not included) for mounting
  • Made in the USA


  • Application: trailers with hydraulic drum brakes
  • Ball size: 2"
  • Gross towing weight: 7,000 lbs
  • Maximum tongue weight: 700 lbs
  • Mounting: straight, 3" wide trailer tongue
  • Model number: DA70
  • 1-Year warranty

Note: Because this actuator does not include a reverse lockout, it is recommended that you equip your trailer with free-backing brakes so that you can drive in reverse without the actuator triggering your trailer's brakes.

When you apply the brakes in your tow vehicle, deceleration occurs and momentum pushes your trailer toward the rear of your vehicle. With surge brake systems, the hydraulic actuator is triggered as your trailer moves forward, once your tow vehicle starts to slow down. When this happens, the actuator contracts, applying force to its master cylinder. This in turn supplies the necessary hydraulic pressure to engage your trailer's brakes.

EZ-Latch Coupler

Cast Coupler Cutaway

This coupler features a simple-to-use latching mechanism known as the EZ-Latch. With this mechanism, hooking up is as easy as dropping the coupler over your trailer hitch ball. The latch does not need to be tugged or manually activated to allow the ball into the coupler socket, nor does it have to be secured in place. Just make sure that the coupler is properly lined up with the ball when you lower it, and the rest is automatic. Disengaging the coupler is just as effortless. Simply lift up the handle and the coupler socket will automatically release its grip on the ball.

Demco EZ-Latch in Use

The contoured, low-profile design of the latch handle helps protect the coupler from damage by allowing any potential hazards - from debris on the road to your ball mount backing into the coupler - to simply slide over the top. This helps prevent anything from getting under the latch handle and releasing the ball, and it can also limit any damage to the coupler should an impact occur

Unlike most couplers, which have a pin hole on the handle latch, the EZ-Latch coupler features a hole on the side of the coupler itself. Inserting a coupler lock through this hole will keep the latch from lifting, preventing disconnect and theft.

Sturdy, Corrosion-Resistant Construction

Made of sturdy steel, this hydraulic trailer brake actuator features a durable zinc coating that is designed to limit rust and corrosion. This zinc coat has a 120-hour salt spray rating. In addition, the composite master cylinder is made of corrosion-resistant glass-reinforced nylon to further ensure durability.

8705001 Demco DA86 Hydraulic Trailer Brake Actuator for Drum Brakes - 2" Ball Easy-Latch Drop Coupler 0 7,000 lbs
Replaces Demco DA86 and 8605001

Item # DM72VR

Customer Reviews

Demco Hydraulic Brake Actuator - Drum - Zinc - 2" Ball - 7,000 lbs - DM72VR

Average Customer Rating:  4.7 out of 5 stars   (58 Customer Reviews)

Surge-type actuator features a corrosion-resistant composite master cylinder and durable zinc plating with a 120-hour salt spray rating. EZ-Latch coupler mechanism makes hookup a snap. Bolt-on application.


I’ve owned this for 1 year now and have towed about 3,000mi at a 4K lb capacity - it works great and have had zero issues. Honestly this is the easiest hitching mechanism I’ve used, and there’s no need for a lock pin. Goes on smooth and releases easy every time. I highly encourage cutting off your old surge hitch and replacing it with this one, so much time saved with how easy it is. Even bleeding the brakes was a breeze by pulling the emergency lever by hand. Great product.


The hitch was good. The instructions weren't complete. There's no reference to how to release emergency lever. No hardware provided. For this price it should have. I used grade 8 bolt setup with washer, lock washer and lock nut. The install of brake valve was tricky. Overall time to change it was less than 20 minutes. Most of my time was spent installing brake line. For the trouble of an incomplete video demonstration, no hardware, and no clear instruction of emergency lever I'm giving it 3 stars. Overall the hitch worked and was a good upgrade.


i purchased this unit along with the electric lock out solenoid. they were priced excellent and arived promtly. very high quality units and very easy to install. only wish a page on how to bleed the unit came with it, instead of having to hunt one up on the internet. after finding instructions on how to bleed th unit it was quite simple and easy.very satified with the purchase


Great product and very easy to install. The holes lined up with the existing ones. I do wish it came with the new bolts as it would make it easier to install, hence the 4 stars.

It’s still working great and love how easy it is to hook up to my receiver.
Bryant - 06/02/2022


Quick shipping, great product. Very easy install.




Direct replacement for older model. Customer service kept me up to date on delivery which was very much appreciated. Worked great with the Demco DA66B lockout solenoid and cover fit perfectly.


Nice unit. Two of the holes lined up with my old Attwood unit but looked like it sat a bit high. Instructions as to proper install would have helped. Drilled 3 new holes and good to go. Took a bit of work and bending to get my brake line to connect but worked out fine in the end.


We have only used the trailer a few times but so far, so good :)


Good service and timely delivery of good products. Have the right parts delivered the first time means less headaches. Only shop here for my trailer needs. They have everything.


Fit perfectly!


Installed this part in replacement of an Atwood 61101 on my four winns trailer. It bolted right up. I added the reverse lockout solenoid. Well built part that arrived quickly. Thanks!


This new hitch (quick coupler) design is very cool. Installation is easy and it fit perfectly.


Bolted right up to the standard 3" spread bolt pattern. One point of caution. See how the steel is doubled up when looking at it from behind? If your old one was not, you will need longer bolts. Just make sure you have 1/2-13 x 4.5" bolts on hand before install. Your old ones may be too short. I had to run to Lowes for bolts to complete install. 5 stars had it come with bolts.


arrived on time. Packaged good. Have not mounted on trailer yet .


The fitting on the end of master cylinder was cross threaded. I recapped it. I really hope it doesn't leak, it's too late in the game to get another one, we leave in a week. Have other things to do.


Quality product. Easily replaced my old Atwood 171 coupler. Delivered days before advertised date.

I called Demco for some technical information. Although the instruction clearly state to bolt the unit on, Demco advised against welding this coupler to my trailer.


Great replacement for the (almost) 30 year old Dico actuator, which was completely worn out. The auto locking ball latch is a great feature too.


Perfect for application and great price and super fast shipping


Fit right on my older double axel boat trailer. Very solid construction. The EZ hitch is actually a very nice feature. Great product.


great hitch works great


Customer service was outstanding. They helped me find what would work for boat trailer. Very polite and had great prices.
I will let others know of there great service.


This was a great update to meh 1991 Mastercraft Trailer.


Arrived early and appears to be very well made. I’ll be installing today.


waiting on other parts to fully assemble so i can not say to much yet, i did receive the item well packed in a timely manner thank you

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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Wilson B
Updated by:
Wilson B
Employee Mike S
Written by:
Mike S

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