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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
Retail:$1,399.00
Our Price: $1,049.94
You Save: $349.06
Brake Actuator
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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 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
  • 1600 psi
  • 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





Customer Satisfaction Score:


Customer Reviews

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

Average Customer Rating:  4.7 out of 5 stars   (60 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.

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!


Comments
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!
Doctor P - 07/26/2019


by:

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


Comments
Thank you for reaching out! Customer service will be in touch to assist you.
-- Etrailer Expert Jenny N - 10/25/2022


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:

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


Comments
Yes the brake actuator is working very fine. Easy to install.
Terry - 04/28/2022
Yes the brake actuator is working very fine. Easy to install.
Terry - 04/28/2022


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




by:

It always works and was simple to install. I'd like to give it 4.5 stars because there is a noticable lag as the motor comes to life and builds pressure. I'd like to have all the stopping power available *right now*.

I haven't used other systems. It's entirely possible that this system is comparatively responsive. But if I were starting over, I would seek something that kicks in faster.




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:

Amazing company and excellent customer service with good quality of the product.




by:

Etrailer is the place for trailer parts.




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:

THANK YOU FOR THE FAST SHIPPING AND FRIENDLY SERVICE




by:

Fast shipping,and part is the correct part. Another excellent transaction thanks


Comments
The actuator was shipped and arrived very quickly. I installed it myself, Im not a mechanic, Im a car Hauler, but it was an easy job. One brake line and a few wires, and then bled the system. It was a direct replacement, the exact same part that came with my trailer. One year later, no issues at all, its working fine.https://www.etrailer.com/Brake-Actuator/Dexter-Axle/K71-651.html#review1033864
Steve M - 05/11/2022


by:

Picture of the hydralic actuator installed.




by:

The brake actuator has performed great for about a year now thank you for checking in with me




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.


Comments
Unit works well, Im very pleased with it.
Art - 05/28/2016


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:

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.




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:

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.




by:

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.




by:

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!




by:

I used this model to replace an older version that ended up failing on our trailer. This version seems to be much stronger than the old. I’m not running the truck controller as high as I use to and I am getting the same breaking power.




by:

Pleased with the pump. It was used as a replacement on an enclosed trailer with electric over hydraulic brakes. Worked well.




by:

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


Comments
Works better then the original
George - 04/03/2019


by:

Used this product to replace a failed ActiBrake sytem. Worked perfectly. Dimensions were almost exact, wiring very simple and thread size was the same. Performance of this product was just as expected. Thank You, etrailer for prompt and precise service and great pricing.



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Show More Reviews

See what our Experts say about this Dexter Brake Actuator

  • Troubleshooting Electric Over Hydraulic Braking System on 53 Foot Carson Trailer
    Without knowing the exact brand of brake controller or being positive about the model of electric over hydraulic actuator, I won't be able to provide you with much in the way of specifics, but I'd be happy to provide you with some general troubleshooting strategies. Since you state the electric over hydraulic actuator is operating, I'm leaning more toward there being a problem with the brake controller or the trailer brakes themselves. Is this a recent problem, or have the brakes always...
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  • Is 2016 Chevy Silverado Integrated Brake Controller Compatible with Electric Over Hyd Trailer Brake
    In 2015 Chevy started putting integrated brake controllers in their trucks that were compatible with electric over hydraulic actuator systems. Your 2016 Chevy brake controller would work well with the Dexter actuator that is in the trailer you are wanting to purchase.
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  • Dimensions of Dexter Electric Over Hydraulic Brake Actuator K71-651
    The Dexter Electric Over Hydraulic Brake Actuator # K71-651 has overall dimensions of 11 x 6 x 7-inches tall, as noted on the product page. I confirmed these dimensions along with the other information you asked for when I went to our warehouse to measure this item. The four mounting holes are 1/4-inch in diameter and are spaced at 2-1/2 x 9-13/16-inches on center. The hydraulic fitting is a threaded female type of 3/8-inch inside diameter.
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  • Is a Dexter Elec./Hydraulic Brake Actuator Damaged if it was Ran Dry
    I spoke with my contact at Dexter and when I explained to him your situation he said you are totally fine. He said that the actuators will be totally fine if they were temporarily ran dry.
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  • Will Dexter Electric Over Hydraulic Actuator Work with 2011 Ford F-350 Integrated Brake Controller
    The Dexter part # K71-651 has been confirmed as a fit for all model years of Ford integrated controllers. What you described sounds like the controller not being setup properly. Since the actuator is technically working and is responding to changes on the controller that makes me think that the actuator is just doing what it is told to. Is there a second setting on the controller that is either sensitivity or ramp-up speed? It sounds the controller just needs to be set up properly. When...
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  • Trailer Disc Brakes are Weak with Titan BrakeRite EHB Actuator and P2 Brake Control on 2008 Tundra
    You actually do not want to lock up trailer brakes at any speed. You want the brakes to be at a point just under lock up for the same reason that you don't want your car tires to lock up; traction and stability. A proportional controller can lock up trailer brakes but there are other factors involved such as the condition of the brakes and rotors. The pads coming apart after a short time makes me think that the brakes may be the wrong size for the trailer or that the actuator you are using...
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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...
    view full answer...
  • Troubleshooting Dexter Actuator that Reacts Slow And Spongy After Replaced Brake Line
    DOT3 and DOT 4 fluid are compatible with each other, that is not the problem you are experiencing. Most likely you need to bleed your brakes again. It sounds like you didn't quite get all of the air out of the lines and that is why they feel soft or spongy. Try bleeding your brakes again and see if that helps, email me back if the problem persists.
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  • Dexter Electric Over Hydraulic Actuator Runs But Does Not Build Pressure
    If the Dexter actuator, # K71-651, is not building pressure then according to Dexter the unit could be defective. If the unit is wiring up correctly, see diagram, and you ahve run through all of the troubleshooting procedures below and it is still not working properly, it will need to be sent in to Dexter for repair. Unit will not run or brakes are slow to respond. To determine if the unit is functioning properly, perform the checks outlined below. 1. Verify that the trailer and tow vehicle...
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    Image 1 for
  • Is the Dexter Electric Over Hydraulic Brake Actuator # K71-651 Legal for Use in Canada
    I checked with my contact at Dexter and he informed me that the Dexter Electric Over Hydraulic Brake Actuator # K71-651 that you referenced is legal for use in Canada.
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  • Will Dexter Electric Over Hydraulic Actuator part # K71-651 Work With Integrated Brake Controller
    The information we have that states that the Dexter Electric Over Hydraulic Actuator part # K71-651 will work with the 2015 GMC Sierra integrated brake controller came straight from Dexter so we know it will fit and work well.
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  • Dexter Electric Over Hydraulic Actuator Runs Constantly and Goes Through Brake Fluid Fast
    That fluid has to be going somewhere! What you can do is have someone activate the manual override on the brake controller in the vehicle cab while checking for leaks. Make sure the reservoir is full though. If it is not leaking at a line or connection somewhere then check the wheels cylinders at the brake assemblies. You might also notice brake fluid on the backs of the wheels or in that general area. You want the brakes to be applied full so make sure the controller is set to the maximum...
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  • How To Check If Dexter Electric Over Hydraulic Brake Actuator Needs To Be Replaced
    I have attached a diagram that shows how the Dexter Electric Over Hydraulic Brake Actuator, part # K71-651 needs to be wired. You may want to check the wiring to make sure it is wired correctly and none of the wires show any signs of damage. Make sure any of the connections are not corroded or damaged and repair as needed. There are 2 tests you can run to make sure you know if it is a bad unit or not. First, connect the white wire to the negative post of the battery. Then connect the...
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    Image 1 for
  • Can a Trailer Battery Be Used for Breakaway Battery for Electric Over Hydraulic Actuator
    As long as the battery you use for the breakaway of the Dexter Electric Over Hydraulic Brake Actuator # K71-651 has at least a 9 amp/hour rating it could be used as a breakaway battery. As far as using a cigarette lighter style connection as a way to make a quick disconnect for the battery you would have to check with your local DOT on that. It theory it would work great and fine, but the DOT local to you might require a more permanent installation.
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  • Can Electric Over Hydraulic Actuators Get Submerged in Water on Boat Trailer
    You would not want the Dexter Electric Over Hydraulic Brake Actuator # K71-651 to get submerged with water while launching your boat. You will need to install it on your boat trailer in a position that would not allow it to encounter any water.
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  • Does Breakaway Battery of a Dexter Electric Over Hydraulic Actuator Have to Be Charged to Function
    With the use of the Dexter Electric Over Hydraulic Actuator part # K71-651 the breakaway battery has to be charged otherwise it won't work. With standard electric drum brakes the brake controller would still control the brakes of your trailer like normal with a dead breakaway battery. This setup is very different that with and electric over hydraulic setup but that may be where the confusion is. When wired up properly (see diagram), the tow vehicle will put a maintenance charge on the...
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  • Electric Over Hydraulic Braking System for Two 10K Oil Bath Trailer Axles
    By definition hydraulic brakes will never be as low maintenance as electric brakes. There are more parts involved so more that can wear out or go wrong. Electric over hydraulic adds even more components into the system. But you can certainly use an electric over hydraulic system. You would need a system that matches the brake type: drum or disc. Drum brakes require a lower psi than disc brakes. I have included a link to the right to all of the electric over hydraulic actuators we carry....
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  • Troubleshooting Dexter Hydraulic Brake Actuator not Running When Brakes are Applied
    The 5:00 position of your 7-way is the brake output circuit which should see voltage when the brake controller is activated by either the brake pedal or manual override. The 7:00 position of the connector should be the ground circuit and should not show any voltage if you are using a circuit tester on it. It almost sounds like you have some circuits mixed on your vehicle's 7-way. Check out the picture I attached and make sure your 7-way is wired accordingly. The 12 volt power circuit should...
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    Image 1 for
  • Wiring for Dexter Electric Over Hydraulic Brake Actuator # K71-651
    When it comes to the wiring for the Dexter Electric Over Hydraulic Brake Actuator, # K71-651: 1. The black wire will connect to the 12V circuit coming from the vehicle's trailer wiring that is always hot. 2. White is the ground. 3. The yellow wire will only supply power when the brake-away pin is pulled. 4. The blue wire carries voltage from the brake controller to the actuator. The difference in voltage affects the amount of braking force that the actuator pump will produce. Lower...
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    Image 1 for
  • Troubleshooting Dexter Electric Over Hydraulic Actuator that Runs When Disconnected
    It sounds like there is a short somewhere in your trailer wiring that is causing the # K71-651 to run. Unless the actuator itself has an internal problem the only way it is going to activate is if it senses that a truck is connected. The black wire of the actuator is what powers it. Most likely what is happening is that there is a short somewhere on this circuit from your breakaway battery circuit. I would go out there at test to see if there is 12 volts of power on the black wire without...
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    Image 1 for
  • Troubleshooting Dexter Electric Over Hydraulic Brake Actuator Pump that 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...
    view full answer...
  • Dexter Electric Over Hydraulic Actuator Not Working with Factory Brake Controller on 2014 Ram 3500
    Since the factory brake controller on your 2014 Ram 3500 has an electric over hydraulic mode, it should work just fine with the Dexter actuator. But since it isn't there are some things you can try. First, check to see if you have to have the trailer connector or disconnected when putting the controller in electric over hydraulic mode. That could make a difference. If that is not the issue then you may need to adjust the power output (if possible in EOH mode). Make sure the trailer connectors...
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  • Testing The Dexter Electric Over Hydraulic Brake Actuator
    Yes, you have a couple of ways to test the Dexter DX Series Electric Over Hydraulic Brake Actuator # K71-651. The first test to try is to connect the white wire to the negative post of the battery. Then connect the black wire to the positive post on the battery. The unit may click but should not run. If it does run, it is a bad unit and needs to be replaced. The other is to leave the white wire connected to the negative post on the battery and connect the yellow wire to the positive post...
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  • Dexter DX Series Electric Actuator Not Fully Releasing Disc Brakes
    There could be a couple things happening here with the setup after you re-built the Dexter DX Series Electric Over Hydraulic Brake Actuator part # K71-651 for Disc Brakes. There could be an issue with the check valve in the actuator which is not allowing the fluid to be released properly. If that is the case then it it not user serviceable. It could also be a blocked rubber brake line from the actuator to before the brakes tee off on the trailer. I recommend to replace your rubber lines...
    view full answer...


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