1. Brake Actuator
  2. Dexter Axle
  3. Electric-Hydraulic Brake Actuator
  4. Drum Brakes
  5. 1000 psi
Dexter DX Series Electric Over Hydraulic Brake Actuator for Drum Brakes - 1,000 psi

Dexter DX Series Electric Over Hydraulic Brake Actuator for Drum Brakes - 1,000 psi

Item # K71-650
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Brake Actuator
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Shipping Weight: 12 lbs
K71-650 - Drum Brakes Dexter Axle Brake Actuator
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Electric-hydraulic brake actuator works with your brake controller (sold separately) to activate your trailer's drum brakes. Vented housing releases heat and moisture. Enhanced wiring protection safeguards internal electronics. Call 800-298-8924 to order Dexter Axle brake actuator part number K71-650 or order online at etrailer.com. Free expert support on all Dexter Axle products. Guaranteed Lowest Price and Fastest Shipping for Dexter DX Series Electric Over Hydraulic Brake Actuator for Drum Brakes - 1,000 psi. Brake Actuator reviews from real customers.
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Dexter Axle Brake Actuator - K71-650

  • Electric-Hydraulic Brake Actuator
  • Drum Brakes
  • Dexter Axle
  • 1000 psi

Electric-hydraulic brake actuator works with your brake controller (sold separately) to activate your trailer's drum 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 drum brakes
  • Maximum output pressure: 1,000 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 1,000 psi of pressure output to provide strong stopping power for your drum 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

K71-650-00 Dexter Axle DX Series ElectroHydraulic Brake Actuator - Drum Brakes - 1,000 psi

Customer Reviews

Dexter DX Series Electric Over Hydraulic Brake Actuator for Drum Brakes - 1,000 psi - K71-650

Average Customer Rating:  5.0 out of 5 stars   (4 Customer Reviews)

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

- K71-650

As advertised quick shipping 941580

- K71-650

Got my Brake Actuator so fast. I love that these guys have so much stock, amazing prices, and do customer service the old fashioned way!!! Thank you etrailer.com?? 923418

- K71-650

Best thing I ever did I got breaks now 913735

- K71-650

Great price and arrived earlier than expected. Etrailer does not disappoint! 738811

- K71-650

This 1000 PSI actuator works great on my tadnem trailer. Also the OEM controller in the 2016 Ram 5500 works very smoothly on the braking of this unit. No Problems 572388


Ask the Experts about this Dexter Axle Brake Actuator

  • Best Actuator To Convert From Air Over Hydraulic to Electric Over Hydraulic Brakes On a Trailer
    Yes, the Dexter DX Series Electric Over Hydraulic Brake Actuator is an excellent option to convert a trailer from air over hydraulic to electric over hydraulic brakes. The correct model for you will be dependent on if you have drum or disc brakes. If you have drum brakes then you need part # K71-650 but if you have disc brakes then you need part # K71-651. Please note, in order to use an electric over hydraulic actuator with a factory brake controller you'll need an adapter, the Electric...
    view full answer...
  • Dexter Hydraulic Brake Actuator part # K71-650 Troubleshooting
    Here is the troubleshooting guide for you to use to determine what in your system is failing you. Could be one of three components being wiring, brake controller or actuator and this will help you identify which one it is. Detach all wires from the Dexter Axle E/H unit leaving only the blue, black, white and yellow wires. It is important that the unit is disconnected from any other wires going to the towing vehicle or breakaway switch and breakaway battery. Failure to do so may result...
    view full answer...
  • 3/16 inch to 1/4 inch Thread Adapter for Use with Dexter EOH Actuator K71-650
    The male thread of the Replacement Adapter Fitting # T4871700 being longer would not be an issue when installing it in the back of the Dexter actuator part # K71-650. Pressure from the male side flare fitting to the actuator is what seals it so the threads being longer would not be an issue.
    view full answer...
  • Recommended Electric Over Hydraulic Actuator for Drum Brakes
    I have a soluton for you, but the Dexter EOH Actuator # K71-651 is designed for disc brakes and the pressure generated for those would damage the components of drum brakes. Instead I recommend using the Dexter # K71-650 which has 1000 psi and is designed for use with drum brakes. You can use your existing drum brakes and lines with this actuator. If you don't already have an EOH compatible brake controller, please let me know what your tow vehicle is and I'm happy to get you the best...
    view full answer...
  • How to Bleed Electric Over Hydraulic Trailer Brakes
    Below is the general process for bleeding an electric over hydraulic brake actuator like # K71-650. Fill reservoir with NEW brake fluid. Never re-use brake fluid that has been salvaged or removed from another system. Remove the key from the breakaway switch to start the unit. Start with the brake furthest from the actuator. Open the bleeder screw and allow it to remain open until you see brake fluid that is free of air bubbles. Close that bleeder screw and move to the next brake...
    view full answer...
  • Brake Lines and Fittings for electric Over Hydraulic Brakes on a 40 Foot Tandem Axle Trailer
    Basically you will run the lines back and T-off where needed. A kit like # 9579-2 would work though you may need to add additional brake line (available and auto parts stores) to complete the installation. I have included a picture that shows a basic set up. A system with 1,000 psi is fine for drum brake applications. Since some pressure is always present in the wheel cylinders in drum brakes, larger psi capacities are not needed. I have included a link to the drum brake electric over...
    view full answer...
  • Wiring the Breakaway Switch to Dexter Electric Over Hydraulic Drum Trailer Brake Actuator
    The orange/black wire does connect to the positive battery terminal on the breakaway battery from kit # 34-285. The blue wire connects to the yellow wire on the actuator, # K71-650. I have included a picture showing how everything gets wired up.
    view full answer...
  • Dexter Electric Over Hydraulic Actuator Not Working with Ford Factory Brake Controller
    The Ford factory brake controllers are listed as compatible with the Dexter electric over hydraulic actuator # K71-650. It is possible that something else is going on causing the unit to not work. There are some common things to check: Check to see if the white ground wire runs directly to the tow vehicle ground. IT MUST NOT BE GROUNDED TO THE TRAILER ONLY. IT IS IMPORTANT THAT THIS GROUND WIRE RUNS DIRECTLY TO THE TOW VEHICLE'S BATTERY GROUND. NO EXCEPTIONS. Detach all wires...
    view full answer...
  • Troubleshooting Dexter Electric Over Hydraulic Trailer Brake Actuator Cycles On and Off
    First thing you will need to do is check that all of the wiring of the actuator and your brake controller are correct. I attached a couple diagrams that should be helpful 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...
    view full answer...
  • Electric Over Hydraulic Actuators Compatible With DOT 5 Brake Fluid
    The Dexter Electric Over Hydraulic Brake Actuator - 1,000 psi # K71-650 will provide enough pressure for drum brake applications. If your application is disc brakes, you will want the Dexter Electric Over Hydraulic Brake Actuator - 1,600 psi # K71-651. Dexter is the only company that confirms the use of DOT 5 with their actuators and I've attached a photo from their service manual showing compatibility.
    view full answer...
  • Can a Trailer have Both Air Over Hydraulic and Electric Over Hydraulic Brakes
    Yes, you could switch to electric over hydraulic brakes and retain the air over hydraulic braking system. What you would have to do is have the main lines that come out of each actuator go to a hydraulic T fitting, obtained locally, that has a valve, either automatic (like a butterfly valve) or manual. Then from that fitting the lines would continue back to the brakes like normal. A fitting with a valve would prevent one actuator from pushing fluid into the other actuator. But be sure...
    view full answer...
  • Inconsistent Gooseneck Trailer Braking with P3 Brake Controller and Electric Over Hydraulic Brakes
    There is most likely a bad wiring connection and it could be the ground. With a weak ground that could limit the amount of voltage getting to the system so if you turned up the power on the P3 to compensate then when the connection is strong the braking is too aggressive. There could also be an issue with one of the other wires or with the brake fluid lines themselves, and even a problem with the wheel cylinders or brake shoes. I would start with the electrical components. You want...
    view full answer...
  • Electric Over Hydraulic Trailer Brakes Not Working with a 2016 Ram 5500
    It sounds like the 7-Way connectors are not pinned out in a standard configuration. I have included a picture that shows the vehicle side functions of a 7-Way trailer connector. Use a circuit tester such as # 40376 to determine the functions of your 7-Way and then change the pin out on your 7-Way accordingly. Electric over hydraulic trailer brakes will only work with certain brake controllers. If your 2016 Ram 5500 has the factory brake controller then make sure it is set to the electric...
    view full answer...
  • Can I Use the Dexter DX Brake Actuator To Convert Drum Brake to EOH On Triple Axle Trailer
    The Dexter DX Series Electric Over Hydraulic Brake Actuator for Drum Brakes part # K71-650 will work well to actuate your drum brakes on the triple axle trailer when you switch over to electric over hydraulic brakes. You will also need a brake line kit. The longest brake line kit we have available is HydraStar Hydraulic Brake Line Kit - Triple Axle - 25' Long, 3/16" Main Line part # HS496-253. I do not believe this line kit will be long enough but I do not know how far back your axle. If...
    view full answer...
  • 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,...
    view full answer...
  • How to Wire the Dexter Electric Over Hydraulic Brake Actuator # K71-650
    Yes, the Dexter Electric Over Hydraulic Brake Actuator, item # K71-650, is designed to work with most electronic brake controllers including your factory installed controller, if it is compatible with electric over hydraulic brakes. You will need to check with Ford to determine whether your OEM controller is compatible with electric over hydraulic braking systems. Wiring connections for the Electric Over Hydraulic Brake Actuator are as follows. Yellow - Cold side of breakaway switch,...
    view full answer...
  • How to Wire the Dexter Electric Over Hydraulic Trailer Brake Actuator
    Wiring connections for the Electric Over Hydraulic Brake Actuator are as follows. Yellow - Cold side of breakaway switch, The wire that goes hot when a breakaway occurs. Black - Positive connection on breakaway switch, The wire that charges the breakaway battery. Blue - Output from in cab controller, The wire that provides power from your brake controller. White - Ground The white ground wire will attach to the negative battery terminal on the trailer break away battery. The 12...
    view full answer...
  • Brake Controller Recommendation to be Compatible with Dexter Electric Over Hydraulic Actuator
    You will need a brake controller that is designed to work with electric-over-hydraulic brakes like the Prodigy P2 part # 90885. The Primus part # TK90160 that you referenced will not work with electric-over-hydraulic brakes and that is why your setup is not working properly.
    view full answer...
  • Hydraulic Drum Brake to Electric Drum Brake Conversion for Gooseneck Trailer w/ 10,000 LB Axles
    Yes, you can convert the hydraulic drum brakes to electric drum brakes on your gooseneck trailer. I have included the link to all of our electric brake assemblies for a 10,000 lb axle. Just use the filters on the page to see if we have one that will work for you. I do recommend replacing your hub/drum assembly as well because not all hub/drum assemblies will work with both hydraulic and electric brake assemblies. We only offer one option for a 10,000 lb axle and that is part # 8-430-5UC3....
    view full answer...
  • EOH-Compatible Trailer Brake Controller to Replace Factory Unit in 2005 Ford F-350
    Trailer brake controllers must be designed expressly to be compatible with electric-over-hydraulic trailer brake actuators like the Dexter DX Series EOH drum brake actuator # K71-650. This means that on their main menu screen there must be a setting option for EOH actuators. If not then the controller will not operate properly with the EOH actuator which presents a very different electrical load to the controller than standard electric trailer brakes. Your 2005 Ford unit most likely does...
    view full answer...
  • How To Install and Operate Dexter Electric Over Hydraulic Brake Actuator
    To install the Dexter Electric Over Hydraulic Brake Actuator, part # K71-650, you would need to install a brake controller that is compatible with a electric over hydraulic brakes and then part # K71-650. To install part # K71-650, you must use at least a 9 amp/hour breakaway kit, like Dexter Breakaway Kit, part # 34-285. To hookup part # K71-650, you will connect the Yellow wire to cold side of breakaway switch, which is the wire that is hot when breakaway occurs. The Black Wire connects...
    view full answer...
  • Conversion of Air Over Hydraulic to Electric Over Hydraulic Brakes
    Thanks for including a picture! Actually, the electric over hydraulic actuators have their own reservoir as the brake line connects directly to the unit. The integrated brake controller you have isn't compatible with electric over hydraulic because it won't activate the actuator properly. If you provide me the year of your Ram, I will be more than happy to recommend a brake controller. However, one of our most popular brake controllers is the Tekonsha Prodigy P2 # 90885. It includes...
    view full answer...
  • How Wide of a Trailer Frame Can the Dexter DX Series Actuator Be Mounted On?
    The mounting feet on the Dexter DX Series Electric Over Hydraulic Brake Actuator for Drum Brakes # K71-650 are going to be right at 3" wide and the distance between the mounting holes on each foot is 2-1/2" center-on-center. You will be able to mount this directly on your 3" wide trailer tongue but we do not have a mounting bracket available for this specific actuator. You might be able to fabricate something on your own, but I don't believe it will be needed because the mounting feet that...
    view full answer...
  • Troubleshooting Power Draw of Dexter EOH Actuator on Trailer Auxiliary Battery
    Your Dexter electric over hydraulic actuator like # K71-650 shouldn't be connected to your auxiliary battery. It should be powered by the trailer connection from the tow vehicle and the only battery connection should be the breakaway battery that is connected which shouldn't have any power transfer unless the breakaway switch pin is pulled. If the power draw you were referring to was on that yellow wire connected to the break-away switch, then that switch is bad and needs to be replaced. I've...
    view full answer...
  • Troubleshooting an Electric Over Hydraulic Actuator that Randomly Locked Trailer Brakes.
    Check the connections of your breakaway system you have on your trailer. It sounds like the plug might be partially pulled or the power from the battery of that system has some how shorted out to the brake output circuit and is telling the actuator to lock up the brakes. I attached a help article on breakaway systems for you to check out as well.
    view full answer...
  • Brake Controller Compatible with Electric Over Hydraulic Brakes and 2007 Chevy Silverado Classic
    There are only certain brake controllers that work with electric over hydraulic braking systems. The Tekonsha Primus # TK90160 is not compatible but both the P2 # 90885 and the P3 # 90195 do have electric over hydraulic modes and would work with the Dexter system you have. The biggest difference between the P2 and P3 is that the P3 has easy to read diagnostics and more setting options so it is very user friendly but both are excellent controllers. Both controllers will also use the same...
    view full answer...
  • Will Dexter Electric Over Hydraulic Brake Actuator Work With 2010 Chevy Silverado Factory Controller
    The Dexter Electric Over Hydraulic Brake Actuator # K71-650 that you referenced is NOT designed to work with the factory controller on your 2010 Chevy Silverado. In order to use the Dexter actuator a compatible controller such as the Prodigy P2 Brake Controller # 90885 needs to be installed. The P2 is designed to work with electric over hydraulic brake systems. The Dexter actuator also requires a minimum 9 amp/hour breakaway kit like Dexter # 34-285. The wiring connections for the...
    view full answer...
  • Building A Gooseneck Trailer Which Braking System is Recommended Electric/Electric Over Hydraulic
    When installing the braking system you will want to make sure that the parts are compatible with the weight capacity of the axles, brake mounting flange, and spindles that you will be using to build your trailer. To add brakes to the gooseneck trailer that you will be building you will need a brake controller installed in the vehicle that you will be towing the trailer with. The brake controller sends signal to the trailer that the vehicle is braking, brake controllers require a wiring...
    view full answer...

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