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

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

Part Number: K71-651
In Stock
$917.69
Retail:$1,362.89
You Save: $445.20
Brake Actuator
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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 etrailer.com. 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
  • Boat Trailer
  • Travel Trailer
  • Dexter

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.


Features:

  • 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


Specs:

  • 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


California residents: click here


Customer Satisfaction Score:

Ratings & Reviews

4.6

110 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.

by:

I've been using this brake actuator for a year now and it works great with no issues. I'm using it on a 40' gooseneck flatbed trailer with 12,000# Dexter axles and disc brakes.



by:

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.

Chris T. profile picture

Chris T.

11/3/2024

I had a problem with the actuator in the summer that I diagnosed was a faulty unit. E trailer sent a new unit free of charge and got me back on the road. Thank you E trailer again for the great service.



by:

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. profile picture

Doctor F.

7/26/2019

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!



by:

Easy to order, quick response and delivery time. Customer service was very helpful with some questions on the installation of the product.



by:

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.



by:

we are used many of this Actuator for the past 15-20 years



by:

Product has worked flawlessly since I installed 15,000 miles ago.



by:

No problem with the Dexter master cylinder, but I sent an email to customer service about potential product issues but never received a reply, thus the 4 star rating. Cannot get the Dexter master cylinder to operate with either of my Ford trucks.



by:

Picture of the hydralic actuator installed.



by:

easy install, works great

Joshua profile picture

Joshua

9/20/2024

still works wonderfully, installed for a customer about a year ago on his boat trailer and no complaints so far



by:

All went great as always when I buy from trailer



by:

The product was great the shipping not so great I paid for overnight shipping 88.00 to get it next day, we didn’t revive it until a day later. But spent 88.00 for overnight. This is the only issue I have you pay to get something next day for a reason you need it. Let’s see if someone contacts me and says we’re going to make this right. That will tell really how well this company works with its customers. I’ll be waiting on that call with a resolution on the shipping expense and experience.



by:

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. profile picture

Brad F.

10/16/2023

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.

Mike L. profile picture
Etrailer Expert

Mike L.

11/8/2023

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


by:

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!



by:

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 ETrailer.com 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!



by:

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.

Art profile picture

Art

5/28/2016

Unit works well, Im very pleased with it.



by:

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

Terry profile picture

Terry

4/28/2022

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

Terry profile picture

Terry

4/28/2022

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



by:

Forget surge brakes, this should be the standard setup. Liked it so much I bought it again for my new to me boat and trailer.



by:

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.



by:

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.



by:

these were installed on my Landmark fifth wheel. you have to know what you are doing to install the hydraulic brake actuator and hydraulic lines. But WOW what a difference. I think that my Landmark has more braking power than my pickup truck now. thanks



by:

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.



by:

Installation was easy. Pump works better the original on my airstream trailer..

George profile picture

George

4/3/2019

Works better then the original



by:

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.



by:

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 eTrailer.com 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.


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Show More Reviews

See what our Experts say about this Dexter Brake Actuator

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    Like you said, many factory integrated brake controllers will not work well with electric over hydraulic trailer braking systems. Some of the newer versions of these controllers now have an electric over hydraulic mode. Check to see if any of your trucks have this mode and, if they do, if the braking starts working with the pedal. Otherwise there are a couple of solutions to solve this issue. First, there may be an adapter that will allow the factory controllers to work but it depends...
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  • Converting Three 7,000 Pound Dexter Axles to Electric Over Hydraulic Brakes
    I can certainly help you out with a disc brake set up on your trailer. The first thing we need to find out in order to select the correct parts would be the inner and outer bearing numbers stamped into the sides of the bearings in the hubs you have now. With that information I can ensure that we get you the right parts. I would also need to know the bolt pattern of the wheels and what kind of braking system the trailer currently has. Also, do all 3 of the axles have brake mounting flanges?...
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  • Replacement Brakes, Hub and Drum Assembly with L44649 Inner and Outer Bearings on 2000lbs Axle
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  • Does Integrated Brake Controller of 2015 GMC Sierra 3500 Require Adapter to Use Dexter EOH Actuator
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  • Troubleshooting Too Much Pressure With A Dexter Electric-Over-Hydraulic Actuator
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  • Dexter Electric Over Hydraulic Brake Actuator Pump Runs But Brakes Do Not Work
    You will want to start by following the troubleshooting tips in the manual for the electric over hydraulic actuator, # K71-651. I have outlined them here for you: 1. Verify that the trailer and tow vehicle are wired according to the electrical schematic shown in “Electrical Requirements”. 2. Re-bleed the trailer brakes. Any air in the trailer brake system causes brake delay 3. if the trailer is equipped with drum brakes, re-adjust the drum brakes to the trailer manufacturer's recommended...
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  • Will Dexter EOH Actuator # K71-651 Work with Factory Integrated Brake Controller in 2014 GMC Sierra
    My research on the GMC truck forum website does indicate that, according to a GM technician, starting with the 2014 model year K2XX trucks the factory ITBC is directly compatible with EOH actuators, although this was not the case for earlier model years. In order for an electronic brake controller like the factory integrated unit in your GMC Sierra, or an aftermarket type like the popular Tekonsha Prodigy P2 # 90885, to properly operate an electric-over-hydraulic trailer brake actuator...
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  • Troubleshooting Dexter Brake Actuator that Runs All the Time When Connected
    Hey Bob, when just the power and ground is connected on a brake actuator like the Dexter DX part # K71-651 you won't hear the unit prime itself. It would do this once a connection to trailer brakes is made which would be the blue wire that runs to the trailer brakes. If it's running continuously I would check to make sure the breakaway switch isn't pulled or wired up wrong.
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    This is definitely something that is frustrating and unfortunately, my answer is not going to be much better. When we have brought this to Dexter in the past, they have told us that their Electric Over Hydraulic actuators like the Dexter DX Series Electric Over Hydraulic Brake Actuator # K71-651 are compatible with all years of the Ford integrated brake controllers so it should work fine without needing any type of adapter. Using an adapter like the # DX35FR will not make a difference. But...
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  • EOH Adapter For A 2018 Chevy 2500 With A Factory Brake Controller
    It is possible that we can offer you an adapter which will allow the factory brake controller on your 2018 Chevy 2500 to work with electric-over-hydraulic brakes. This is a known issue for the 2018 chevy trucks. We will need to know specifically what brand/model of actuator you have on your trailer, as the adapters are brand specific. We have the # HBA-CAM which will work with Gen 6 and newer Hydrastar Actuators. There is also # DX35FR which will work with the Dexter BrakeRite actuators....
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  • Dexter DX Series Electric Over Hydraulic Actuator Not Running Properly
    Thank you for your purchase from etrailer of the Dexter DX Series Electric Over Hydraulic Brake Actuator for Disc Brakes # K71-651. There is a troubleshooting guide in the manual, and gives the following steps: 1. With a fully charged breakaway battery and trailer plug disconnected, pull the breakaway switch on the trailer. 1. If the unit runs and builds pressure, the breakaway system is functioning properly. 2. If the unit runs and builds pressure when the breakaway switch is pulled but...
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  • Adapter to Allow Dexter DX EOH Actuator to Work with Integrated GM Brake Controllers
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  • Troubleshooting a Dexter Brake Actuator After Replacing a Break Away Switch
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  • Troubleshooting Dexter Electric Over Hydraulic Brake Actuator Not Applying Pressure to Brakes
    The pump should come on when you hit the brakes with your Dexter EOH system. I hope you have the Dexter # K71-651 for disc brakes versus the # K71-650 you asked from which will not work with disc brakes because it won't provide enough pressure. If you have the correct system and the actuator pump is working, then the issue would be in your hydraulic lines or in your electric brake controller settings. The settings would only have to do with the amount of power for braking pressure, where...
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  • How To Switch From Electric Drum Brakes To EOH Disc Brakes For 10k General Duty Dexter Axles
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  • Compatibility Of Dexter DX EOH Disc Brake Actuator With Hydrastar HBA-CAM OEM Adapter Module
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  • Troubleshooting Dexter Brake Actuator
    I spoke with my contact at Dexter and there is a way to troubleshoot your actuator. If you use a 12 volt battery and connect just the white wire from the actuator to the negative post and then connect the black wire to the positive side of the battery, you could possibly hear a click sound but the actuator should not turn on. If it does turn on and run, the unit is defective and needs to be replaced. This would be done without having the blue wire connected. If you have disc brakes on...
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