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  1. Brake Actuator
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  4. Disc Brakes
  5. 1600 psi
Dexter DX Series Electric Over Hydraulic Brake Actuator for Disc Brakes - 1,600 psi

Dexter DX Series Electric Over Hydraulic Brake Actuator for Disc Brakes - 1,600 psi

Item # K71-651
Our Price: $799.94
You Save: $690.05
Brake Actuator
Shipping Weight: 12 lbs
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Electric-hydraulic brake actuator works with your brake controller (sold separately) to activate your trailer's disc brakes. Vented housing releases heat and moisture. Enhanced wiring protection safeguards internal electronics. 1-800-940-8924 to order Dexter brake actuator part number K71-651 or order online at Free expert support on all Dexter products. Great prices and Fastest Shipping for Dexter DX Series Electric Over Hydraulic Brake Actuator for Disc Brakes - 1,600 psi. Brake Actuator reviews from real customers.
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Dexter Brake Actuator - K71-651

  • Electric-Hydraulic Brake Actuator
  • Disc Brakes
  • Dexter
  • 1600 psi

Electric-hydraulic brake actuator works with your brake controller (sold separately) to activate your trailer's disc brakes. Vented housing releases heat and moisture. Enhanced wiring protection safeguards internal electronics.


  • Electric-over-hydraulic brake actuator activates your trailer's hydraulic brakes when you apply the brakes in your vehicle
    • Brake controller (sold separately) is required to send signal from tow vehicle to actuator when brakes are applied
    • 7-Way trailer connector (sold separately) is needed to transmit signal from brake controller
  • Improved functionality when compared with surge brake couplers
    • Faster response time - activates when you apply brakes in tow vehicle, as opposed to when trailer pushes against hitch ball
    • No need to manually lock out brakes when you back up
    • Trailer brakes can be intentionally activated when you reverse
    • Manual override on brake controller can be activated so you can engage the trailer brakes without having to apply your vehicle brakes
  • Vented design releases pressure, moisture, and heat to protect the internal components
    • Allows actuator to be mounted in places where most actuators would overheat
  • Electronic, proportional pressure valve ensures smooth, even braking
  • Self-priming pump reduces time needed for brake bleeding
  • Enhanced wiring detects dangerous current levels and shuts down actuator electronics in the event of a surge
  • Durable aluminum housing and stainless steel fasteners resist corrosion
  • Goretite seals protect the circuit board from the elements
  • Compatible with most 9-amp-hour-battery breakaway kits (sold separately)
  • DOT compliant
  • Unit installs on trailer frame and connects to trailer's wiring and hydraulic brake lines (sold separately)
  • Made in the USA


  • Application: single-, tandem-, and triple-axle trailers with disc brakes
  • Maximum output pressure: 1,600 psi
  • Dimensions: 11" long x 6" wide x 7" tall
  • Distance between mounting holes (center to center):
    • 2-1/2" Between holes on same side of bracket
    • 9-13/16" Between holes on opposite sides of bracket
  • Mounting hole diameter: 1/4"
  • Hydraulic port size: 3/16"
  • Power: 12V DC
  • Wire configuration:
    • Black: 12-volt power
    • Blue: brake controller
    • Yellow: breakaway
    • White: ground
  • 2-Year limited warranty

Dexter DX Series Actuator

The Dexter DX Series electric-over-hydraulic actuator is a dependable choice for your trailer braking needs. It is capable of up to 1,600 psi of pressure output to provide strong stopping power for your disc brakes. The lightweight, corrosion-resistant housing has fins and vents built in to shed excess heat. Inside the housing, the unit features enhanced wiring protection, allowing it to detect dangerous current levels to prevent damage from surges or improper wiring. Another internal highlight is the solid-state electronics, which regulate the actuator's electrical components to ensure consistent performance. All of this is cleanly secured within the aluminum housing by stainless steel fasteners, while Goretite seals protect the internal electronics from exposure to water and other elements. The DX series also remains compatible with most aftermarket and OEM-integrated electric brake controllers on the market.

Electric-Over-Hydraulic Actuator vs. Standard Surge Brake Actuator

With the DX series electric-over-hydraulic actuator, you can get all the benefits of towing with an electric brake controller while using hydraulic brakes. Because this actuator will activate according to the setting you have chosen for your brake controller (sold separately), you will have more control over when and how your trailer brakes engage. Depending on the features of your brake controller, you may be able to control both the rate and intensity with which your trailer's brakes activate. If you have a proportional brake controller, your brakes will be activated with an intensity that matches the braking speed and power of your tow vehicle.

This gives you multiple benefits over a standard surge-type actuator. Your trailer's braking will be tied to the braking activity of your vehicle instead of the momentum of your trailer. This will help to limit stress on the tow vehicle, and it will give you the ability to reverse without the trailer's brakes kicking in.

You can also activate the manual override on your brake controller to send out full braking power to the actuator. This will activate your trailer's brakes with full intensity. This is especially useful when traveling down steep hills with a fully loaded trailer. In instances like this, the trailer may require maximum braking power to avoid a jackknife situation.

Large Brake Fluid Reservoir and Self-Priming Pump

The large brake fluid reservoir in this actuator ensures that there'll be enough hydraulic fluid to handle a single-, tandem-, or triple-axle trailer regardless of its size. A self-priming pump reduces the time needed for bleeding the brakes and prevents the brake fluid from emptying back into the reservoir when the actuator is not in use.

Dexter DX Series Actuator Installation

Before installing this actuator, be sure that you have an electric brake controller with an output capacity of at least 5 amps.

You will also need enough 3/16" diameter automotive brake line (sold separately) to connect the unit to your brakes.

Mount the actuator level and upright in a dry area on your trailer. It is recommended that you mount the actuator near the front of your trailer. Do not mount it near the trailer axles or at the rear of the trailer.

The Dexter DX Series actuator splices into your trailer's wiring. Follow the diagram below when connecting the wires. 12-Gauge wire is required, but 10-gauge wire is recommended to ensure the best performance.

Wiring Diagram

K71-651-00 Dexter Axle DX Series ElectroHydraulic Brake Actuator - Disc Brakes - 1,600 psi

Installation Details K71-651 Installation instructions

Customer Satisfaction Score:

Customer Reviews

Dexter DX Series Electric Over Hydraulic Brake Actuator for Disc Brakes - 1,600 psi - K71-651

Average Customer Rating:  4.6 out of 5 stars   (90 Customer Reviews)

Electric-hydraulic brake actuator works with your brake controller (sold separately) to activate your trailer's disc brakes. Vented housing releases heat and moisture. Enhanced wiring protection safeguards internal electronics.


Pump works great. Disc brakes with this pump work 10 times better that electric drum brakes. 4 stars because it took a couple of months to get

Brad F.


Brakes are still working great. I have a 9k skidsteer on a 14k dump trailer that I haul with my F150 and have now worries about being able to stop.

Etrailer Expert

Mike L.


@BradF Great to hear that, properly working trailer brakes are big-time important!


When the OEM steel brake lines wore out on my boat trailer I decided to upgrade the surge brakes to electric over hydraulic (EOH). I replaced the damaged lines and wired up this Demco actuator and now I can stop my trailer on a dime -- should have done this 10 years ago. The actuator works flawlessly with my 2017 GMC's built in controller -- nothing else was needed!

Please note though that the GM controller does not apply the brakes when depressing the pedal if the vehicle is not moving (duh). So don't be surprised if you try to test it sitting in your driveway and think that it's not working -- it's designed that way to save wear on the pump if you're not moving. Pressing the manual control does apply the brakes though. (The brakes also apply if you're on an incline).

I fabricated a mounting plate out of 3/8 aluminum since the trailer tongue was not wide enough and attached the pump using 4 countersunk 1/4" stainless bolts and then used two 1/2" square u-bolts to affix it to the trailer. If I set the gain on the truck to max, I can actually lock the trailer's wheels, something that surge brakes can't do on their best day!

Back in 2010 I upgraded my disc brakes to Kodiak all stainless steel rotors, mounting plates and calipers -- 8 years old and they were still like new -- also well worth the money!

Doctor F.


Every trailer should be set up like this! Imagine power disc brakes on the trailer, just like your car. Theres a reason that drum brakes arent used anymore. Trailer manufacturers are just too cheap to build then right. Heres your opportunity to fix that!


Together, I couldn't be happier with my setup. The Dexter K71-651 provides more than enough power to stop my little single axle boat trailer and when the emergency break-away is activated, I can't roll the tires by pulling forward, they lock solid. I love the combination of this unit with the Redarc TowPro Elite, and these two have completely changed the way my trailer handles. If I was starting over, I would buy exactly this setup again. Thank you to for excellent customer service and quick shipping. I received my unit in 2 days, and my entire order was exactly as purchased. They even emailed me on the day it was delivered to ensure I received it!


The Dexter Electric over Hydraulic break actuator is amazing!!! It connects directly to my 2023 Ford F150 which has the trailer towing option that includes braking gain adjustment by brake pedal pressure. I had surge brakes on my boat trailer and that was MISERABLE. Changing from surge to the Dexter system is a massive relief of problems, worries and safety. I am going to purchase a second system for my utility trailer. Thanks etrailer!


I installed this system on my 18,000 lb tri-axle boat trailer. Installation went very well and everything seems to be a great fit. I will not hook the truck to it until spring but I am very anxious to see the improvement over surge brakes. I was able to make a neat clean install and wiring directions were great.


I love this thing! I live in the Santa Cruz mountains in California and that is not where you want surge brakes, had those, they burned up (I go from 1800 feet to sea level).

Upgrading to electric over hydraulic has been amazing, so much better. It's work but so worth it if you have to go down hills.

It works great, no issues.


The actuator works flawless and connected right up to where the previous unit was. The orginal unit had been submerged under water by the previous boat owner. I highly recommend E trailer for all your parts.


Seems to work quite well even though I only have gotten to use the trailer for a couple of times. The garage I had taken it to to get work done left it sit for over 10 months before finally getting to it.


Product is good, only had issues with the shipping which is not etrailers fault. So I would suggest paying extra for next day and not do regular.


Picture of the hydralic actuator installed.


Item was very easy to install and seems to be working well. I was surprised at how loud the unit is under full activation (e.x. pulling the breakaway switch). Also I found out the hard way that I needed a heavier high temp breakaway switch, as mine started smoking and the wires started to melt when I puled the breakaway during a test. I ordered the Dexter K71-691-00 switch to hopefully resolve the issue.



Unit works well, Im very pleased with it.


order came with oil or brake fluid all over box and item

Etrailer Expert

Jenny N.


Thank you for reaching out! Customer service will be in touch to assist you.


Worked as should easy to


Like the DX brake actuator first time I used one it was simple to install. Thank every much for electric over hydraulic.



Yes the brake actuator is working very fine. Easy to install.



Yes the brake actuator is working very fine. Easy to install.


Only 3 stars because the unit is not repairable. After a lightning strike nearby may be what damaged my controller I had to get a totally new unit. Upon opening the old unit up I could see there was just one component on the circuit board that was damaged. There should be an option to buy just the circuit board along with a gasket kit. It is a very expensive unit and I question the durabilty of the unit. There is a warning in the instruction manual that warns about sensitive electronics and also says the complete unit must be REMOVED from the trailer before any welding repair is made. If this thing is so sensitive you had better hope it does not crap out when you need your trailer brakes the most. I wish there was another option other than this "SENSITIVE" piece. etrailer was OK to buy from no issue there.


I have had these on a few trailers now and they work great. However this time I had to purchase another component to make my 2018 GMC sense the brake actuator was there. I’m not sure if they have corrected this yet however my buddy recently purchased the same from etrailer and it worked perfect on the same year exact same truck. Other than this it’s a great product.


1600 PSI electric over hydraulic brake actuator -- very easy installation. Brake Fluid reservoir holds quite a bit and made bleeding the brakes an easier task.

Kudos go to for their quick delivery of the brake actuator - Juanita T was especially helpful in both the selection and follow-up on the product. Special thanks go to her.


Brake pump is correct and delivery was timely




This actuator does exactly what it's designed for. The wiring is very heavy duty and the instructions for connections are printed right on top. The cast aluminum end plates make mounting very easy and the self-priming pump made bleeding the whole system about a 3 minute project. The large reservoir holds plenty of spare fluid and the pump modulates the braking performance in perfect sync with the signal coming from the pump. My Prodigy P3 controller has a setting specifically for hydraulic pump control and it works very will with this pump.


Terrible system. Put foot on the brake and it takes a few seconds to activate and when it does it locks up the tires and no way to adjust ive found


Easier install than the Titan controller that went bad on me.

The videos show one person for the bleed of lines.
It really needs two. One to operate the pump and one to bleed.
I tried myself, but after bleeding 2 lines the pump started to make noises.
Hurried to shut off before it ran too long.
It works fine after the whole installation was done.


East install as it was a replacement for the same unit that was ruined by an employee running it out of fluid. Brakes work fantastic if you keep brake fluid in the unit!


easy install, works great


Etrailer is the place for trailer parts.

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