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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Dexter Electric Over Hydraulic Brake Actuator 1000 psi
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  • 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. Call 800-298-8924 to order Dexter Axle brake actuator part number K71-650 or order online at 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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  • Reviews (1)
  • Q & A (65)
  • Videos (1)
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  • Why etrailer?

Dexter Axle Brake Actuator - K71-650

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

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

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Dexter Axle Brake Actuator - Electric-Hydraulic Brake Actuator - K71-650 Review

Today we're going to take a look at the Dexter electric over hydraulic brake actuator. Has a 1,000 psi capacity. This electric over hydraulic brake actuator will activate your trailer's hydraulic brakes when you apply the brakes in your tow vehicle. It does require a brake controller to send the signal from the tow vehicle to the actuator when the breaks are applied. This is compatible with most electronic brake controllers that have the electric over hydraulic brake function, and time-based brake controllers are not recommended. The other thing this does require is a seven-way brake connector, that's needed to transmit a signal from the brake controller.

The 1,000 psi rating is suitable for drum brake applications, and as you can see it has a very large reservoir capacity. Does use solid state electronics. It does require a four-wire hookup, as you can see the four wires right here. Basically the yellow wire, if you take this yellow wire that'll connect to the cold side of the breakaway switch. That's the wire that goes hot when a break occurs. A black wire right here, that'll go to the positive connection on the breakaway switch, and that's the wire that charges the breakaway battery.

The blue wire right here, that'll go to the output form the end cap controller. That's the wire that provides power from your brake controller. Then the last one is the white one, which is a ground wire. This actuator does require a minimum 9 amp-hour breakaway kit. This part will meet or exceed all Department of Transportation regulations and federal braking requirements. Comes with a nice operations manual. The last thing I want to show you is some dimensions on it.

The overall width, we're going to measure furthest edge to furthest edge, and it's going to be right at about 11 inches long. The width on it, we turn it this way, at the widest point it's going to be right at about six inches, and the height on this, at the highest point, from the bottom up to the very top right here, it's going to be right at 7 inches tall. That should do it for the review on the Dexter electric over hydraulic brake actuator with the 1,000 psi capacity.

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   (1 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

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
Do you have a question about this Brake Actuator?

  • 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,...
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  • Troubleshooting Dexter Electric Over Hydraulic Brakes That Hold Brakes Too Long
  • With the Dexter Electric Over Hydraulic Brake Actuator - 1,000 psi # K71-650 or # K71-651, there are some electric brake controllers that don't work as seamlessly as others. The brakes staying engaged for a few seconds after you release the pedal is an indication of a compatibility issue with your controller. If you are using a factory integrated brake controller, that may be the issue. Many of them say they are compatible and yet have some issues like what you stated. I've attached...
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  • Are Electric Over Hydraulic Trailer Brake Actuators Compatible with Factory Brake Controllers
  • It all depends on which electric over hydraulic actuator you are using. If your truck has an integrated brake controller it might be compatible. But you mentioned having a 2009 2500HD but I do not know if it is a Silverado, Sierra, or Ram. If we are talking factory integrated controllers then GM trucks are not compatible with the HydraStar # HBA16, # HBA-12, or # HBA-10 unless you use adapter # HBA-CAM (which only works with the model HydraStars indicated on its product page). It...
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  • 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...
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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,...
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  • Troubleshooting a Trailer Brake Actuator
  • The Dexter E/H 1000 you referenced like # K71-650 could certainly be worn out. 10 years is a good lifespan. I would check the fluid levels and ensure there isn't any cut or frayed wires. Also, you will want to ensure the 12 volt battery the actuator is attached to should be fully charged. A depleted trailer battery could cause the unit to stop working. And lastly, there could be an internal short within the actuator. These reasons could be the cause of the intermittent working and not working. If...
    view full answer...

  • Dexter EOH Disc Brake Actutator Compatibility with 2018 Ford F-350
  • The only modification needed on your F-350 to enable use of an electric-over-hydraulic trailer brake actuator like the Dexter # K71-650 (for drum brakes) or # K71-651 (for disc brakes) is installation of a trailer brake controller such as the Prodigy P3 # 90195. Not all trailer brake controllers are compatible with EOH actuators but the P3 has this capability that is easily selected on its main menu screen. The P3 also lets you store specific power settings that you can call up when...
    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...

  • 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...

  • Parts Needed to Add Electric Over Hydraulic Brakes to a Trailer with Vacuum Over Hydraulic Brakes
  • We actually have an FAQ article on everything you will need to add electric over hydraulic trailer brakes to a trailer. I have included a link to it for you. You already have a the brakes and brake mounting flange, so you will just need a new brake line kit, electric over hydraulic actuator, and a compatible brake controller. None of the actuators work with all factory integrated brake controllers so you will need to use an adapter. I recommend the Carlisle Hydrastar, # HBA16. It is...
    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...

  • 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.
    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...

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Info for this part was:

Expert Research:
Michael L
Expert Research:
Robert G
Expert Research:
Michael H
Installed by:
Jeff D
Expert Research:
Reno H
Expert Research:
Jameson C
Expert Research:
John H
Expert Research:
Adam R
Expert Research:
Lori W
Expert Research:
Rachael H
Updated by:
Sarah W
Updated by:
Brian T

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