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  1. Brake Actuator
  2. Dexter
  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
Our Price: $1,056.52
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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 drum brakes. Vented housing releases heat and moisture. Enhanced wiring protection safeguards internal electronics. 1-636-306-4830 to order Dexter brake actuator part number K71-650 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 Drum Brakes - 1,000 psi. Brake Actuator reviews from real customers.
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Dexter Brake Actuator - K71-650

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

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 Satisfaction Score:

Customer Reviews

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

Average Customer Rating:  4.5 out of 5 stars   (14 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.


I would rate customer service at 5, products at 4 only because I haven't installed them yet and shipping at 1 because electric brake controller was boxed with jack and hitch both heavy items and box was ripped open from shipping which is not your fault but controller was pinched between jack and hitch.


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


Excellent customer service and shipping was very fast


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


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


Best thing I ever did I got breaks now






As advertised quick shipping





See what our Experts say about this Dexter Brake Actuator

  • Will the Dexter DX Series Actuator # K71-650 Work with a 7K Triple Axle Trailer
    The Dexter DX Series Electric Over Hydraulic (EOH) Brake Actuator # K71-650 is compatible with single, double, and triple axle trailers so it will work great for your application! I have attached a review video as well as a helpful article regarding electric over hydraulic drum brakes for you to check out. Please note that you need the brake mounting flange, drum brake assembly, hub and drum, EOH actuator, brake line kit, breakaway kit, and brake controller. If you are missing any of...
    view full answer...
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  • 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 and...
    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 from the...
    view full answer...
  • How Many Brake Assemblies Can Be Operated by Dexter EOH Drum Brake Actuator K71-650
    The Dexter DX Series Electric Over Hydraulic Brake Actuator for Drum Brakes, part # K71-650, is suitable for use with single-, tandem- or triple-axle trailers with hydraulic drum brakes. The unit installs on the trailer frame and connects to the trailer's wiring and hydraulic brake lines. The wiring configuration is Black: 12-volt power; Blue: brake controller; Yellow: breakaway and White: ground.
    view full answer...
  • Dexter Electric Over Hydraulic Actuator Recommendation for Drum Brakes
    I wish there was a pressure reducer, but you'll have to swap out your disc brake Dexter Electric Over Hydraulic actuator for the drum brake version # K71-650 and you'll be set.
    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...
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  • Dexter Electric Over Hydraulic Actuator K71-650 Recommendation for Triple Axle Drum Brakes
    Yes, the Dexter Electric over Hydraulic Actuator part number K71-650 will work well on a triple axle trailer with drum brakes.
    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...
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  • Compatibility of Dexter Axle # K71-650 Brake Actuator with OEM Brake Controller on 2011 Ford F350
    According to Dexter Axle, their # K71-650 EOH Brake Actuator is compatible will all proportional brake controllers, including the OEM TBC on your 2011 F350.
    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 volt power...
    view full answer...
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  • 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 to...
    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 Brakes Sticking With Dexter DX Series Electric Over Hydraulic Actuator K71-650
    I am sorry to hear you are having an issue with your Dexter DX Series Electric Over Hydraulic Brake Actuator for Drum Brakes - 1,000 psi # K71-650. When I reached out to Dexter and they had a few thoughts. First is to make sure that the drum brakes are adjusted properly as incorrectly adjusted brakes can cause the # K71-650 to not work as quickly as designed. I included a link to a help article that goes over adjusting the brakes for you to take a look at. Second is to bleed the brakes...
    view full answer...
  • Dexter DX Series Electric Over Hydraulic Brake Actuator for Drum Brakes Won't Run
    I checked with Dexter and there are quite a few different possibilities of what the issue could be for the Dexter DX Series Electric Over Hydraulic Brake Actuator for Drum Brakes # K71-650 not running. You said all the wiring looks good, but it is important to test the actuator, and there is a specific way to do this. Detach the wires leaving the blue, yellow, black, and white wires loose. Then use a 12 volt battery connect the white wire to the negative terminal and the black wire to...
    view full answer...
  • Troubleshooting Dexter DX Series Electric Over Hydraulic Brake Actuator
    The black wire on the Dexter DX Series Electric Over Hydraulic Brake Actuator, # K71-650 is the positive line from the tow vehicle so yes it should be showing current, 12 VDC/40amp. Verify current and condition of fuse if the wire is getting hot enough to melt the insulation you may have a short. This should 12 gauge wire or better.
    view full answer...
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  • 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...
  • Recommended EOH Actuator for Use with 2016 Ram 3500 Factory Brake Controller
    Yes, the Dexter 1000-PSI Drum Brake Actuator # K71-650 will work fine with the factory-installed trailer brake controller in your 2016 Ram 3500 pickup. It will work with all model years without the need for any additional parts or adapters.
    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...
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  • Dexter Electric Over Hydraulic Actuator Will Not Build Pressure
    I spoke to a Dexter engineer about the issue you are having with your actuator. They informed me that it could be one of two different things not allowing the pump to build pressure. These two things could be an issue with the control board or the proportioning valve. The first thing you will want to check is the control board. The control board which sends voltage to the proportioning valve could be faulty. In order to test this you will need to pull the breakaway pin and see if you get...
    view full answer...
  • Wiring Diagram for Dexter DX Series Electric Over Hydraulic Brake Actuator
    We do have a wiring diagram for you! Whether you have the 1,000 psi Dexter DX Series # K71-650 or the 1,600 psi Dexter DX Series # K71-651 the wiring will be the exact same. I have attached a wiring diagram and review videos for you to check out. Just let me know if you have any additional questions regarding the installation.
    view full answer...
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  • 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...
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  • Can the Dexter EOH Actuator # K71-650 Be Converted to be Used on a Disc Brake System
    We do carry a Dexter EOH Brake Actuator that will work with disc brakes, but the Dexter Actuator, # K71-650, is designed to be used with hydraulic drum brakes only. The Dexter # K71-651, has a 1600 psi rating that is suitable for a disc brake system on a trailer.
    view full answer...
  • Will Dexter Electric Over Hydraulic Brake Actuator Work with Drum Brakes
    I spoke with my contact at Dexter and he said the Dexter Electric Over Hydraulic Brake Actuator # K71-651 is for disc brakes applications. A unit designed for disc brakes does not have a check valve so the drum brakes cannot function properly. For drum brakes you can use # K71-650. This actuator has a check valve that supplies a little bit of pressure on the wheel cylinders that allows the drum brakes to function properly.
    view full answer...
  • Troubleshooting Electric Over Hydraulic Brakes On 40 Ft Trailer With Dexter Actuator
    The first thing I recommend is to check the brakes you have on your rear axle. It sounds like they are possibly reversed left to right hand. That would cause the problem you are having with them locking when in reverse and not forward. It sounds like the front brakes are acting correctly since they are designed to allow you to back up without locking up as you mentioned. Next, I recommend testing the breakaway switch. With the breakaway battery fully charged and the trailer plug disconnected,...
    view full answer...

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