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  5. 1200 psi
Hydrastar Electric Over Hydraulic Actuator for Drum Brakes - 1,200 psi

Hydrastar Electric Over Hydraulic Actuator for Drum Brakes - 1,200 psi

Item # HBA-12
Our Price: $839.89
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Brake Actuator
Shipping Weight: 13 lbs
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Anodized aluminum electric-hydraulic actuator lets you use your brake controller (sold separately) to activate your trailer's hydraulic drum brakes. Vented end plate releases heat. Includes hardware. Hydraulic lines and breakaway sold separately. 1-800-940-8924 to order Hydrastar brake actuator part number HBA-12 or order online at Free expert support on all Hydrastar products. Great prices and Fastest Shipping for Hydrastar Electric Over Hydraulic Actuator for Drum Brakes - 1,200 psi. Brake Actuator reviews from real customers.
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Hydrastar Brake Actuator - HBA-12

  • Electric-Hydraulic Brake Actuator
  • Drum Brakes
  • Hydrastar
  • 1200 psi

Anodized aluminum electric-hydraulic actuator lets you use your brake controller (sold separately) to activate your trailer's hydraulic drum brakes. Vented end plate releases heat. Includes hardware. Hydraulic lines and breakaway sold separately.


  • Electric-over-hydraulic brake actuator activates your trailer's hydraulic brakes when you apply the brakes in your tow 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 - trailer brakes are triggered 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 end plate releases pressure, moisture, and heat in order to protect the internal components
    • Allows actuator to be mounted in places where most actuators would overheat
  • Electronic, proportional pressure valve ensures that braking is smooth and effective
  • Built-in bleeder screw lets you easily flush air out of the brake lines
  • Durable extruded aluminum provides corrosion resistance
  • Compatible with any standard, 5-amp-hour-battery breakaway kit (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-, or triple-axle trailers (8,000 lbs or larger) with drum brakes
  • Maximum output pressure: 1,200 psi
  • Power: 12V DC
  • Hydraulic port size: 3/16"
  • Dimensions: 11-3/4" long x 3" wide x 7-3/8" tall
  • Wire configuration:
    • Black: 12-volt power
    • Blue: brake controller
    • Yellow: breakaway
    • White: ground
  • 2-Year limited warranty

Note: Do not power wash the Hydrastar actuator or take it through a commercial car wash. High-pressure water may damage the seals on the actuator.

The Hydrastar electric-over-hydraulic trailer brake actuator applies pressure to your trailer's hydraulic brake system in response to the electrical signals sent from your in-cab brake controller. As a result, your trailer's hydraulic brakes will be activated every time you apply the brakes in your vehicle or press the manual override on your controller. This setup is ideal for boat trailers because you will get responsive hydraulic braking, which you control conveniently from inside your vehicle with your electric brake controller.

Hydrastar Electric-Over-Hydraulic Actuator vs. Standard Surge Brake Actuators

With the Hydrastar 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 settings 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. You can also use the manual override on your brake controller, which allows you to engage the trailer brakes without having to apply the brakes in your vehicle. And perhaps most impressive, if you have a proportional brake controller, your brakes will be activated with an intensity that matches the braking speed and power of your rig.

This pump-and-motor-based system increases response time compared with traditional actuators because the trailer brakes are triggered when you apply the brakes in the tow vehicle, as opposed to when the trailer pushes against the hitch ball. This not only gives you faster, more efficient braking, but it also eliminates the pushing sensation that occurs in setups that use standard surge brake actuators.

Hydrastar actuators are also beneficial because, unlike standard surge couplers, they allow you to activate your brakes when reversing down an incline, such as a boat ramp. Having the ability to brake in reverse gives you more control and prevents wear on your tow vehicle.

Hydrastar Installation

Hydrastar Installation Diagram

This Hydrastar electric-over-hydraulic brake actuator will give you years of trailer-stopping performance. The actuator mounts on your trailer's frame with the included hardware. Then it splices into the trailer's wiring and connects to your hydraulic brake lines from the 3/16" female port. Lines and fittings are sold separately.

Durable Construction

Just like other Hydrastar electric-over-hydraulic actuator models, this system is built of extruded anodized aluminum for excellent corrosion resistance. In addition, the weathertight seals protect internal components from the elements.

This actuator also has a vented end plate that releases pressure, moisture, and heat to help prevent any internal damage. Unlike models that are unable to release heat and pressure, this vented actuator can be safely mounted inside of a compartment on your trailer. As a result, this actuator is great for gooseneck and fifth-wheel trailers where finding space on the tongue can be nearly impossible.

Brake Controller Compatibility

Not all electric trailer brake controllers will work with this electric-over-hydraulic brake actuator. See the following table to determine compatibility with common models of brake controllers. For best performance, it is recommended that you use an aftermarket electric brake controller rather than an OEM factory-installed controller.

ManufacturerVehicle Years/Controller ModelsCompatibleCompatible if Used with HBA-CAM
Brake ControllersDraw-TiteActivator (5100)Yes
Activator II (5500 or 5510)Yes
Activator III (5520)Yes
Activator IV (5504)Yes
HayesEnergize III (81741B)Yes
Energize III+ (HA81742B)Yes
Energize XPC (HA81745)Yes
Engage (HA81760)Yes
G2 Brake Boss (81792BB)Yes
Syncronizer (HA81725)Yes
Endeavor (81770)Yes
Genesis (HA81790)Yes
Blackbird (HA81726)Yes
HopkinsImpulse Digital (47325)Yes
Insight (HM47297)Yes
Brake Force (47225)No
Reliance (47284)No
Agility (47294 or 47295)No
MaxbrakeBrake ControllerYes
RedlineRedline TA900Yes
TekonshaProdigy (90185)Yes
Prodigy P2 (90885)Yes
Prodigy P3 (90195)Yes
Primus IQ (TK90160)No
PowerTrac (39523)Yes
Voyager (39510 or 9030)Yes
ValleyVA32812 BlackbirdYes
VA32811 PhantomYes

HBA-12 Cargo Towing Solutions (formerly Carlisle) Hydra Star Electric-Over-Hydraulic (EOH) Brake Actuator - Disc Brakes - 1,200 psi

Replaces Hydrastar HSV381-7066

Installation Details HBA-12 Installation instructions

Customer Satisfaction Score:

Customer Reviews

Hydrastar Electric Over Hydraulic Actuator for Drum Brakes - 1,200 psi - HBA-12

Average Customer Rating:  4.9 out of 5 stars   (32 Customer Reviews)

Anodized aluminum electric-hydraulic actuator lets you use your brake controller (sold separately) to activate your trailer's hydraulic drum brakes. Vented end plate releases heat. Includes hardware. Hydraulic lines and breakaway sold separately.


the unit itself is easy to install and is working great,I bought it last March/April and unpackaged it and installed on during off season in Dec. and noticed the fill cap broken during shipping to Canada, etrailer said they would not replace the $XX.00 cap because too much time has passsed,so un package ASAP.
Otherwise there prices are great.


Cap was broke when I opened the box


The product was great. Very satisfied.


Nice piece, look great and easy to install. Delivered fast.

Frank C.


Juste great, as new


Loved going from Surge brakes to Electric, made a HUGE difference! Make sure to follow the directions, the color coding is not US standard when it comes to green, yellow, brown. BUt works great and easy to bleed.


I am super happy with my replacement of the electric brakes on my camping trailer with this Electric Over Hydraulic Actuator and Hydraulic Brakes. It works SO much better than electric brakes ever did. I feel much safer towing the trailer now.

Scott K.




Adapters to fit brake lines are hard to find … they should include the fittings


awesome service, parts were on time, hassle free!! Thank You Bunches!!!


I need to know how I can connect this 4 color wires on hydrastar actuator to my kaufman trailer??

Etrailer Expert

Heather A.


Thank you for your review. The Hydrastar Actuator will wire to the breakaway kit of the Kaufman trailer and the electric brake controller in the tow vehicle. I have attached an electrical diagram for a visual of how the wires attach. You should already have a brake controller for the electric brakes but if you have an OEM brake controller it will need to be replaced. I recommend the Prodigy P3 90195 which is one of our most popular brake controller options. If you need a breakaway kit, I recommend Hopkins engager break away kit part 20099 because of its convenient push to test button and built in charger.


Very knowledgeable about the product, quick delivery and product looks good is described.


Great price and service


Works great this is the best brand I have had I know have 2 of these.

George H.


Still working great


Pump arrived ahead of schedule already on trailer and working great


Came quick. Just what I ordered

Lori W.


Hi one year later and the Hydrostar actuator I purchased is working great!


This motor is phenomenal. I've put over 30k miles in all sorts of weather and climates and the motor has performed flawlessly


Awesome product, the shipping was incredibly fast for shipping to Canada. Amy was a huge help as I was having issues with payment, and she figured it out instantly. Definitely will buy from them again.


Best price I found on this unit. Very happy with the purchase and delivery. Unit worked perfectly when it was installed


Excellent customer service. Fast shippi ng.



just the right part at a great price. customer service was very helpful and informative.



arrived very quickly exactly what i ord ered




Show More Reviews

See what our Experts say about this Hydrastar Brake Actuator

  • Hydrastar Actuator Recommendation for Replacing Older Actuator
    We do have the HydraStar Electric Over Hydraulic # HBA-12 which is the correct actuator for a drum brake application. This would be exactly what Hydrastar told you to go with.
    view full answer...
  • Is OEM Brake Controller 2021 Chevy Silverado 2500 Compatible with Electric Over Hydraulic Actuator
    The OEM brake controller of your 2021 Chevy Silverado 2500 is compatible with electric over hydraulic actuators like the Hydrastar # HBA-12 that you referenced. You would not need a new brake controller.
    view full answer...
  • Compatibility of Hydrastar HBA-12 Trailer Brake Actuator with OEM Brake Controller on 2017 Ram 1500
    Absolutely. The Hydrastar # HBA-12 Electric Over Hydraulic Trailer Brake Actuator is compatible with OEM brake controllers as long as they have an EOH (electric over hydraulic) mode, which yours does. You'll be good to go, and everything will work together great. The # HBA-12 actuator is actually the favorite of our install crew. It's a rugged unit that works great, is very reliable and is straightforward to install. I'll link to a product description video for the # HBA-12 actuator.
    view full answer...
  • Best Electric Over Hydraulic Actuator for Disc Brakes on a Trailer
    From our personal experience here at the Cargo Towing Solutions HydraStar Electric-Hydraulic Actuator for Disc Brakes # HBA-12 that you referenced has proven to have the fewest issues so because of that I would recommend it as the best one we offer. I have spoken to all of the companies you mentioned and they are all super helpful with any questions that I have had. But the one I have to call the most infrequently for troubleshooting is definitely Cargo Towing Solution (formerly...
    view full answer...
  • Troubleshooting Hydrastar Brake Actuator Not Working
    Checking the fluid level of the Hydrastar actuators like part # HBA-12 is just a matter of removing lid on top and looking to see if it's full or not. But based on what you described it doesn't sound like that is the issue. Low fluid is typically related to a delayed response and not no performance at all. Most likely its wiring related. Hydrastar says to check the condition of all of the wiring but also to make sure you are using 12 gauge wire at least, that the unit is grounding through...
    view full answer...
  • Will the Hydrastar Actuator # HBA-12 Work with Integrated 2015 Ford Brake Controller
    I spoke with my contact at Carlisle who manufacturers Hydrastar about your 2015 Ford F-150 with the factory brake controller. In order for the brakes to operate correctly with the Hydrastar actuator, you will need the Carlisle Control Adapter Module, part # HBA-CAM. You will just simply attach the blue wire to the blue wire on your actuator and the white wire to the white wire on the actuator.
    view full answer...
  • Brakes Stopped Working With HydraStar Actuator
    If this is a newer installation-meaning that you've only recently started using this trailer and actuator with this truck, it could be that your vehicle requires a controller adapter module # HBA-CAM. The controller adapter module is required on Chevy trucks years 2007-2017, so if you have a HydraStar Electric Over Hydraulic Acutator # HBA-12 you will need to add the controller adapter module in order to actuate the brakes on your trailer. If this is a problem that has just recently started...
    view full answer...
  • Recommended HydraStar EOH Drum Brake Actuator for Tandem 10K Axles
    HydraStar Electric Over Hydraulic Drum Brake Actuator # HBA-10 delivers enough pressure for one or two 7K-rated axles but for a trailer with a pair of 10K axles you will instead need the # HBA-12 EOH actuator which can provide the 1200-psi pressure needed for this brake setup.
    view full answer...
  • Hydrastar Electric Over Hydraulic Actuator Hums But Doesn't Run
    It sounds like you are going to need to go through the basic testing procedure to determine where any problems might be on the HydraStar Electric-Hydraulic Actuator # HBA-12. With the unit running and brake pressure applied, determine that a minimum of 8.5 volts DC are reaching the Hydrastar’s black wire. 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...
    view full answer...
  • Can HydraStar Electric Over Hydraulic Actuator For Drum Brakes Be Used For Disc Brakes
    Since you have disc brakes on your trailer you must use a disc brake actuator like part # HBA16. The problem is that with an actuator like part # HBA-12, it will not provide enough pressure to actuate the brakes. The maximum output pressure for the # HBA-12 is 1,200 psi while the maximum pressure for the # HBA16 is 1,600 psi.
    view full answer...
  • Is 1,200 psi Electric Over Hydraulic Actuator Correct For Drum Brakes
    Yes, you do have it right; the 1,200 psi electric over hydraulic actuator is what you'll need for your drum brakes, the Hydrastar Electric Over Hydraulic Actuator for Drum Brakes - 1,200 psi # HBA-12.
    view full answer...
  • Can The Electric Motor On The Hydrastar Brake Actuator Be Serviced?
    Hydrastar currently does not offer service parts for their Electric Over Hydraulic Actuator # HBA-12. This does not necessarily mean you will not be able to repair your actuator. The electric motor inside may just have some corrosion built up inside causing the motor to not turn. I have been able to free motors stuck like this with light taps on the motor shaft to help free everything. Depending on the age of your actuator you may be able to contact Hydrastar and have repairs looked at...
    view full answer...
  • Electric Over Hydraulic Actuator Recommendation for Triple Axle Trailer with Hydraulic Drum Brakes
    The best electric over hydraulic actuator we offer for drum brakes is the HydraStar part # HBA-12. This is our most reliable and fastest performing kit around that we recommend the highest. It can also be used on triple axle trailers like you have as well. You need to use the breakaway kit but it would function without it installed.
    view full answer...
  • Correct Adapter to Use with HydraStar EoH Actuator for 2015 Chevy Silverado 1500
    Assuming your 2015 Chevy Silverado 1500 is equipped with the factory integrated brake controller, you will indeed need to use the HydraStar Adapter # HBA-CAM with the HydraStar Electric Over Hydraulic Actuator like # HBA-12 for proper operation. These adapters are specific to the actuator so the Titan model will not be compatible.
    view full answer...
  • Is HydraStar EOH Actuator HBA-12 Compatible With 2019 GMC Sierra Factory Brake Controller
    The factory brake controller on the 2019 GMC Sierra is compatible with the HydraStar Electric Over Hydraulic Actuator for Drum Brakes # HBA-12. This actuator is compatible with Chevy/GMC factory brake controllers from 2018 and up so you do not need to use the HydraStar Electric Over Hydraulic Actuator Adapter Module # HBA-CAM.
    view full answer...
  • Compatibility Of Tekonsha Prodigy P3 Brake Controller and HydraStar Electric Over Hydraulic Actuator
    Yes, the Tekonsha Prodigy P3 Trailer Brake Controller # 90195 will work with both of the HydraStar Electric Over Hydraulic Actuators Disc # HBA16 or Drum # HBA-12. You will want to ensure that the Prodigy P3 is set to the correct brake type in the setup screen. I have linked a copy of the instruction below for a more visual reference on page 4. To set the correct brake type you will press the menu button on the bottom right of the controller face. Then arrow down to the Brake Type option,...
    view full answer...
  • Parts Needed to Convert Brakes to Hydraulic Over Electric
    To make the conversion, you'd need an electric over hydraulic brake actuator, the specific one depending on if you have disc or drum brakes. You'd want to use the HydraStar # HBA-12 for drum brakes or HydraStar # HBA16 for disc brakes. The other component you'd need is a brake controller compatible with the actuator, such as the Prodigy P2 # 90885. I've added links to video reviews of each of these products for you to take a look at.
    view full answer...
  • Troubleshooting Prodigy P3 Brake Controller and Electric Over Hydraulic Brake Actuator Communication
    It is likely the issue is that you are using the adapter module # HBA-CAM. The Prodigy P3 # 90195 will work with the Hydrastar brake actuators directly. The Carlisle name you may want to look up as some of the Carlisle Hydrastar actuators were recalled. I can guarantee that the P3 controller and the # HBA-12 for drum brakes or # HBA16 for disc brakes will work without an adapter. If your vehicle has a integrated brake controller, you will need to make sure it has been disconnected...
    view full answer...
  • Solution for Older Carlisle HydraStar HBA12 Doesn't Work w 2015 Chevy Integrated Brake Controller
    I have a solution for you, but it requires you to replace your integrated brake controller with one that is compatible with electric over hydraulic brake actuators. For the Prodigy P3 part # 90195 would be what you would need as it has a specific mode for EOH trailers and is basically the nicest controller around. The issue you are having is that your controller just isn't compatible with the # HBA-12 due to it's age. You are correct too that the part # HBA-CAM wouldn't work because of...
    view full answer...
  • Does Curt Spectrum Brake Controller Work With HydraStar Electric Over Hydraulic Actuator
    Yes it does! We have asked HydraStar about this exact issue before and have been told that the Curt Spectrum Trailer Brake Controller # C51170 you asked about will work with the HydraStar Electric Over Hydraulic Actuator for Drum Brakes # HBA-12 or Disc Brakes # HBA16. This set up is going to give you an outstanding combination of braking power with the EOH actuator and braking control with the easy-to-use knob of the Spectrum that will mount wherever is convenient for you. I have added...
    view full answer...
  • Is GM OEM Brake Controller Compatible w HydraStar Electric over Hydraulic Brake Actuator # HBA-12
    Even though our experience tells us that aftermarket controllers are typically more reliable than the OE controllers, if the factory brake controller on your 2007+ GM truck is functional it is not necessary to disable it in order to use a generation 6 or newer HydraStar Electric/Hydraulic trailer brake actuator like the # HBA-12 you mentioned. You would simply need to use the Control Adapter Module, part # HBA-CAM. The adapter module will allow your factory controller to work with the...
    view full answer...
  • Bleeding Electric Over Hydraulic Actuator without Brake Controller
    You can use a hand pump to bleed your trailer's brake lines like the # ALL648591 or you can use 12V power input to the actuator from a charged 12V battery to power the actuator so you can clear the system of air. The HydraStar Electric Over Hydraulic Actuator # HBA-12 uses either DOT 3 or DOT 4 brake fluid; you will need at least a quart to fill the actuator. The written instructions for this item are linked for reference for the # HBA-12.
    view full answer...
  • Actuator to Replace Titan BrakeRite on Trailer
    It would be time to replace the actuator it sounds like. The Hydrastar actuators are widely considered to be the quickest reacting and most reliable so that would be your best option. For disc brakes you'd want the part # HBA16 or which will easily work great on a tandem axle 10k setup like you mentioned.
    view full answer...
  • Hydraulic Air Brakes To Electric Over Hydraulic Brake Conversion On Military Trailer
    Since you already have hydraulic braking assemblies on the military trailer the only thing that you need to convert the air over hydraulic brakes to electric over hydraulic is the electric over hydraulic actuator and a brake controller. If you have hydraulic disc brakes on the trailer, I recommend HydraStar Electric Over Hydraulic Actuator for Disc Brakes part # HBA16. If the trailer has drum brakes I recommend HydraStar Electric Over Hydraulic Actuator for Drum Brakes - 1,200 psi part...
    view full answer...

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