1. Brake Actuator
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  3. Electric-Hydraulic Brake Actuator
  4. Disc Brakes
  5. 1600 psi
HydraStar Vented Marine Electric Over Hydraulic Actuator for Disc Brakes - 1,600 psi

HydraStar Vented Marine Electric Over Hydraulic Actuator for Disc Brakes - 1,600 psi

Item # HS381-8067
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Our Price: $836.35
Brake Actuator
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Shipping Weight: 12 lbs
Hydrastar Electric-Hydraulic Brake Actuator - HS381-8067
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Anodized aluminum electric-hydraulic actuator lets you use your brake controller (sold separately) to activate your trailer's hydraulic brakes. Includes rust-resistant marine-grade gasket and stainless steel hardware. Vented plate releases heat. Call 800-298-1624 to order Hydrastar brake actuator part number HS381-8067 or order online at etrailer.com. Free expert support on all Hydrastar products. Guaranteed Lowest Price and Fastest Shipping for HydraStar Vented Marine Electric Over Hydraulic Actuator for Disc Brakes - 1,600 psi. Brake Actuator reviews from real customers.
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  • Reviews (11)
  • Q & A (54)
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Hydrastar Brake Actuator - HS381-8067

  • Electric-Hydraulic Brake Actuator
  • Disc Brakes
  • 1600 psi
  • Hydrastar

Anodized aluminum electric-hydraulic actuator lets you use your brake controller (sold separately) to activate your trailer's hydraulic brakes. Includes rust-resistant marine-grade gasket and stainless steel hardware. Vented plate releases heat.


  • 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 superior corrosion resistance
    • Marine-grade gasket and stainless steel hardware make this ideal for marine use
  • 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 with disc brakes
  • Maximum output pressure: 1,600 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.

Pair the HydraStar electric-over-hydraulic actuator with your trailer's disc brakes to get the best possible braking setup. With disc brakes, you already have more consistent braking at higher speeds and a shorter stopping distance than you'd get with drum brakes. In addition to more reliable braking, you also have less cost to maintain the brakes as there are fewer moving parts. Combine these benefits with an electric brake controller and you'll get greater control over your already superior brakes, providing you with the best braking performance.

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 stainless steel 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, Marine-Grade Construction

The HydraStar Marine actuator is ideal for use on boat trailers. Just like other HydraStar electric-over-hydraulic actuator models, this system is built of extruded anodized aluminum for superior corrosion resistance. The weathertight seals protect internal components from the elements. The HydraStar Marine actuator also features marine-grade gaskets and stainless steel hardware that won't rust. These extra features make it perfect for marine applications.

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

381-8067 Cargo Towing Solutions (formerly Carlisle) Hydra Star Marine Grade Electric-Hydraulic (EOH) Actuator - 1600 psi - Model MHBA-16

Customer Reviews

HydraStar Vented Marine Electric Over Hydraulic Actuator for Disc Brakes - 1,600 psi - HS381-8067

Average Customer Rating:  4.9 out of 5 stars   (11 Customer Reviews)

Anodized aluminum electric-hydraulic actuator lets you use your brake controller (sold separately) to activate your trailer's hydraulic brakes. Includes rust-resistant marine-grade gasket and stainless steel hardware. Vented plate releases heat.

- HS381-8067

So on the last trailer I converted to hydraulic disc, I used the Titan kit with actuator. This trailer is a cargo trailer for work 14'X8' and not that heavy. I went with Kodiak discs and the Hydrastar actuator. I mounted it inside the trailer to protect it and keep it out of sight. It's so quiet but works flawlessly! Even with the door open, it's tough to hear, so for bleeding, I set up a remote switch to activate the system. It doesn't leak, has plenty of power, and is very smooth coupled with my factory Ford brake controller.. It's been a year, so long time reliability is a wait and see, but so far, I'm very happy.

Perfectly. The Hydrastar actuator works great. A side note: If you live in a humid environment like I doFlorida, make sure to change the brake fluid every year or two as it does suck up water and get dirty.
Rich F - 07/25/2021

- HS381-8067

I've had the Hydrastar system on my trailer now for over a year now with now issues. The brakes work much better than they did before. Easy installation and great service from etrailer

- HS381-8067

etrailer is great to deal with, with excellent product knowledge and shipping. Recently converted the surge brakes to Electric over hydraulic on my Tri axle boat trailer. I was not sure if I needed the adapter for the factory brake controller in my 17 Silverado to work with the Hydrastar marine EOH pump but with one quick question and fast response Etrailer set me straight which allowed for a smooth and simple install. Although I have not had the opportunity to pull the trailer since the upgrade, I was surprised how small the surge coupler pump was compared to the Hydrastar pump and am looking forward to the faster response time and added control over trailer brakes that this EOH pump with give Thank you etrailer

- HS381-8067

My trailer did not have brakes and so I added disc brakes and the HydraStar Actuator. WOW does it work great! No crumby tongue activated brake. This is the best upgrade you could make replacing the clunkey tongue activated brake cylinder. Best money you will ever spend on the boat trailer! Oh by the way "Made In USA".

- HS381-8067

Could not figure out why my brake fluid level was always low. No visible leaks until I noticed moisture at the vent near where the wires came out. Contacted HydraStar and within 5 minutes of submitting a pic of the serial number and receipt from etrailer I had a tracking number. AWESOME product and AWESOME Customer support!!!!!!!

- HS381-8067

Easy to install, direct replacement for the one that failed on my PJ Trailer, has worked flawlessly for the last year 10/10

- HS381-8067

My trailer's stock surge brakes worked pretty well but dragged the brakes driving down hills, did not work while backing down boat ramps, and provided no backup if my vehicle brakes failed... So I got this EOH system to solve those problems. I only test-drove the finished upgrade once but it seemed to work fine. Note that in my 2018 Ram 1500 with integrated trailer brake control, I needed to set this up as "EOH heavy" even though my boat + trailer are under 6000 lbs. I wanted a solid, clean install, so I had a bracket made and welded to the trailer out of harm's way and above the possible high water level, even though it's all theoretically waterproof. Other considerations: - I was able to re-route the stock steel brake line right to the brake unit. - I had to buy a new 7 pin trailer harness to replace the stock 5 pin one. I made a conversion harness to go from the new wiring to the stock trailer wiring. - I locked out the original surge system by replacing its guts (master cylinder, spring, etc) with a steel bar that goes between the front and rear pins. - I hid the breakaway switch inside the tongue and ran the new breakaway cable where the original one went. - I safety-wired the brake reservoir cap to prevent its loss or vandalism. It just didn't seem secure to me. Easy fix! I think it looks good and seems to work well. I expect it will last many years. I gave it only 4 stars as the brakes have some lag (1/2 second?) before I can feel them working. I was led to believe the brakes would be instantaneous and I "would not feel the trailer" (possibly like the electric brakes on my other trailers) but it's not quite that perfect. But maybe I'm being picky! I'd choose this very system again.

- HS381-8067

I bought the electric over hydraulic for my boat trailer so I could convert from surge brakes to using my electric brake controller. I have a large triple axle trailer that came from the factory with surge brakes. I like the security and adjustable control of an electric controller besides it is the law in certain places when reaching heavier weights... The Hydrastar brand was recommended to my by a friend who had had problems with a different brand and is happy with Hydrastar. . etrailer has been my "go-to" for all of my boat trailer and car trailer needs for several years. Additionally I always refer my friends to etrailer and they always report back excellent results. Since we have internet to help with our shopping, I always know I get a good price and quality from etrailer... aside from that the service is excellent as well. Everything I order always shows up on time and usually earlier than expected. What else can I say? Oh and lets not forget the tech support... sometimes trailer stuff is foreign to me. They are always helpful. Give em a Brake

- HS381-8067


- HS381-8067

The brake actuator arrived on time and as advertised. Katie, who took my order was great to work with!

- HS381-8067

Great product


Ask the Experts about this Hydrastar Brake Actuator

  • Electric Over Hydraulic Actuator for Disc Brakes for 2019 Ram 3500 Factory Brake Controller
    The factory brake controller on your 2019 Ram 3500 is compatible with electric over hydraulic systems, so the one I recommend that will work perfectly with your Ram's controller is the HydraStar Vented Marine Electric Over Hydraulic Actuator for Disc Brakes # HS381-8067. I really like this actuator because it has a higher maximum pressure output than most of 1,600 psi, which means the best stopping power, and has an aluminum casing which means it is going to give the best protection...
    view full answer...
  • Converting Surge Brakes to Electric Over Hydraulic on a Tandem Axle Boat Trailer
    The Hydrastar Electric Over Hydraulic Brake Actuator, # HS381-8067, for disc brakes, would be an excellent choice for your boat trailer with Kodiak disc brakes in a saltwater marine environment. The unit is sealed very well with marine grade gaskets, stainless steel hardware, and an anodized aluminum housing, but it should not be submerged in water. You will want to mount the unit as far forward on the tongue of the trailer as possible to keep the unit from being submerged. This system...
    view full answer...
  • Troubleshooting Hydrastar HBA 16 Electric over Hydraulic Trailer Brake Actuator that Runs Constantly
    It's possible. Here's Cargo Towing Solutions troubleshooting procedure for if the actuator won't run, or runs continuously: Verify that the trailer and tow vehicle are wired according to the electrical schematic shown below. Perform the following checks to determine if the unit is functioning properly: 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...
    view full answer...
  • Best Electric Over Hydraulic Brake Actuator for Disc Brakes
    The best, most durable electric over hydraulic actuator for disc brakes is the HydraStar Vented Marine Electric Over Hydraulic Actuator for Disc Brakes # HS381-8067. This EOH actuator has a maximum output pressure of 1,600 psi, which is higher than some others, has a very fast response time, and the fact it is vented means its internal components are protected more than others which do not have that feature. This actuator is the highest quality and most reliable EOH actuator and I highly...
    view full answer...
  • Can I Use a Heating Pad on my HydraStar Actuator to Keep Brake Fluid From Thickening?
    Yes. You can use a stick on heating pad like the Kat's # KH24050 to keep the HydraStar Vented Marine Electric Over Hydraulic Actuator # HS381-8067 warmed up and it's not going to damage the system. With that being said, when your brake fluid becomes more viscous like you're describing, it leads me to believe that there is something else going on that is allowing too much water/condensation into your brake lines. It's possible that too much air got into the system at some point and is creating...
    view full answer...
  • Brakes Not Working On Borrowed Electric Over Hydraulic Trailer With 2011 Chevrolet Silverado
    Some Electric Brake Controllers aren't compatible with Electric over Hydraulic Brake Actuators like the # HS381-8067. You may want to check the compatibility of your brake controller with the system you are using. If you have a GM factory brake controller, they are not compatible with EOH systems. If that is the case, your best choice is to use an aftermarket brake controller, like the Tekonsha Prodigy P3 # 90195, which is compatible with these systems. I've attached an article to help. If...
    view full answer...
  • Troubleshooting Electric Over Hydraulic Braking System that Uses Hydrastar Actuator
    A dead breakaway batter can cause an actuator to not work properly. The actuator draws power from the breakaway battery and the tow vehicle, but most of the amps will be drawn from the battery. The tow vehicle basically just provides a maintenance charge to the breakaway battery. Since it takes a while to get going and the voltage at the actuator is below 12 volts, I would guess either a bad ground or a dirty/corroded trailer connector. I would remove the ground connections and grind...
    view full answer...
  • How to Bleed Trailer Brakes with Electric-Over-Hydraulic Brake Actuator
    The instructions may vary depending on the brand of the electric-over-hydraulic (EOH) actuator but for the HydraStar actuators, like part # HS381-8067 that you referenced, it basically boils down to using the bleeder screw and the brake controller on your vehicle (with your tow vehicle's ignition turned on). The entire process is a bit more complicated than that though so I have attached a clip from the instructions for the HydraStar actuator that walks you through the brake bleeding process.
    view full answer...
    Image 1 for
  • Brakes on My 5th Wheel Are Not Working But Trailer Lights All Work Fine When Connected
    If you have electric brakes or electric over hydraulic brakes, the first thing to do in either case is take a circuit tester like # PTW2993 to test your signal from the brake controller to the trailer connector at the rear of your 2015 Ram or the bed if you have the relocation attachment like # 41157. With the alligator end of the tester clipped to a clean ground, touch the probe to the 5 o'clock position while hitting the manual override on your brake controller. You can also use a 7-way...
    view full answer...
  • Converting my hydraulic disc surge brakes to electric over hydraulic brakes
    Yes, Ford's integrated brake controller in the 2018 model will work with the HydraStar Vented Marine Electric Over Hydraulic Actuator for Disc Brakes # HS381-8067. You will be able to you use a 7 way connector with this actuator and will probably have to go into the brake controller menu to select EOH operation. I've attached a review and installation video for reference.
    view full answer...
  • Troubleshooting Electric Over Hydraulic Brakes Taking A While to Work After Repairing Brake Lines
    The first thing that comes to mind is that you might indeed still have some air in the brake lines on your trailer. It could be that this is preventing the brake shoes to engage completely until they get warm enough to do a better job. This may be why the brakes only seem to start working after pulling the trailer for a bit. When bleeding the brakes you will want to start with the brake furthest from the actuator, opening the bleeder screw and keeping it open until you see that the...
    view full answer...
  • Does a Trailer with Disc Brakes Require an Electric Over Hydraulic Brake Actuator
    It depends on how you want to activate the trailer brakes. You can activate them in 1 of 2 ways. First, if the trailer has a surge coupler, then you do not need an Electric over hydraulic actuator. The force of the trailer pushing towards the truck when you brake pushes in a surge coupler and that sends fluid back to activate the brakes. If you need a surge coupler, I have included a link to the ones that we carry for disc brakes on a trailer. The other option is to use an electric...
    view full answer...
  • Will the HydraStar Electric Over Hydraulic Actuator Part # HS381-8067 Work for Me
    In order to convert the hydraulic disc brakes on your trailer to electric, you will need a electric over hydraulic (EOH) actuator and a breakaway kit. The HydraStar Vented Marine Electric Over Hydraulic Actuator for Disc Brakes part # HS381-8067 is an excellent actuator and will work well with your Tekonsha Prodigy P3 Electronic Trailer Brake Controller part # 90195. For a breakaway kit I recommend taking a look at the Hopkins Engager Push-To-Test Trailer Breakaway Kit with Built-In...
    view full answer...
  • Are Electric Over Hydraulic Actuators Compatible with Integral Brake Controller on 2011 Ford F-350
    Yes, the Hydrastar Vented Electric Over Hydraulic Actuator, # HS381-8067, will work with the factory brake controller on your 2011 Ford F-350. The earlier Ford brake controllers had trouble with these types of system, but Ford changed the brake controller they used in 2009 and they have had very few problems ever since. This actuator will work with most breakaway systems, but if you need to add a breakaway kit to your trailer, I recommend the Hydrastar Breakaway Kit, # HS496-82. If you...
    view full answer...
  • Troubleshooting HydraStar Electric Over Hydraulic Trailer Brakes
    The first step is to ensure that your brake controller is compatible with the HydraStar Vented Marine Electric Over Hydraulic Actuator for Disc Brakes # HS381-8067. I recommend contacting HydraStar directly for compatibility details. If your controller is compatible I would inspect the wiring on the HydraStar unit. There are 4 wires coming out of the unit. White is the 12V ground wire, Black is 12V Positive, Blue goes to 7-way and receives power from the brake controller when pedal...
    view full answer...
  • How To Choose Between a 1,000 Psi and 1,200 Psi Electric Over Hydraulic Actuator
    In regards to an electric over hydraulic actuator, the 1,000 psi model is for drum brakes and the 1,200 psi model is for disc brakes. The size of the axle, etc. are not factors. The most popular option we offer is the HydraStar Vented Marine Electric Over Hydraulic Actuator part # HS381-8067 for disc and part # HS381-8065 for drum.
    view full answer...
  • Prodigy Brake Controller for Use with Electric-Over-Hydraulic Brakes
    A brake controller that is to be used with electric-over-hydraulic (EOH) brakes needs to have a setting for that type of operation. On a controller with this capability, like the Prodigy P3 # 90195, the OEH setting can be selected from the menu screen. Some factory controllers may not have the option for OEH operation so you'll want to check the instructions for your controller to see if/how it can be set for that operation. If it cannot work with EOH actuators then you'll want to choose...
    view full answer...
  • Troubleshooting Prodigy P3 Brake Controller Not Activating Electric Over Hydraulic Brakes
    Sounds like you haven't put your Prodigy P3 part # 90195 into hydraulic mode so it's not able to activate your Carlisle Hydrastar braking sytem. First press the menu/options button. Then, on the SETUP screen, scroll down to brake type and press OK when Hydraulic is highlighted. It will then ask you to confirm. At this point, in the lower left hand of the display, there should be an H, for Hydraulic. This procedure is outlined on page 4 of the installation instructions, which I have...
    view full answer...
    Image 1 for
  • What is the Correct Brake Fluid to Use in Hydrastar Electric Over Hydraulic Brake Actuators
    The brake actuator that you have or purchase will state specifically what fluid you will need to use either on the cap or in the owners manual if not both. For the Hydrastar Electric Over Hydraulic Brake Actuator, # HS381-8067, you would be using DOT 3 or DOT 4 brake fluid. Of course you would not want to mix the 2. If you start with DOT 3 but then later go to bleed the brakes and all you have is DOT 4 then you would need to flush the system first.
    view full answer...
  • Best Electric Over Hydraulic Actuator Recommendation for Gooseneck Trailer
    The electric over hydraulic actuator we recommend the highest is the HydraStar kit part # HS381-8067 that you referenced which is designed for disc brakes. Our installers prefer this kit to all of the other options because of how well it performs and how reliable it is. I attached a review video for this kit as well as an FAQ article on adding EOH brakes to a trailer as well.
    view full answer...
  • Troubleshooting OEM Brake Controller Installation in 2012 Ram 1500
    The OEM-supplied trailer brake controller for the 2012 Ram 1500 is designed to work only with electric drum brakes. It will not work with electric-over-hydraulic actuators such as HydraStar drum brake model # HS381-8066 or the disc brake model # HS381-8067. If you have an EOH setup on the trailer you will need an aftermarket controller that is compatible with it, such as the Prodigy P2 # 90885 or the P3 # 90195, as well as a wiring adapter # 3021-P if the truck came with a factory 7-way. You...
    view full answer...
  • Adding Electric Over Hydraulic Disc Brakes to Boat Trailer
    While we don't have a go to kit we can build one using parts that are available. First is the HydraStar Vented Marine Electric Over Hydraulic Actuator # HS381-8067. If you are building from scratch we have the HydraStar Marine Electric Over Hydraulic Actuator w/ Breakaway and 7-Way RV Harness # HS381-9067 to include the wiring and battery components. Second is the Kodiak Disc Brake Kit - 12" Hub/Rotor - 6 on 5-1/2 # K2HR526DKG. These assemblies are rust resistant for your boat trailer....
    view full answer...
  • Parts Needed to Convert to Kodiak Disc Brakes on 5th Wheel With 7,000 lb Dexter Axles
    We can definitely get you the right Kodiak disc brake kit for your trailer with 7,000 lb Dexter E-Z Lube axles. Converting to disc brakes is a great idea because they have better stopping power drum brakes while also requiring less maintenance as they don't have the moving parts drum brakes do. So for your tandem axle 5th wheel, what you will need are two of the following kits: - Kodiak Disc Brake Kit - 7,000 lb Dexter Axle # K2HR758D The brake kit comes with the correct races, but...
    view full answer...
  • Trailer Disc Brakes are Slow to Respond when Connected to a 2010 Dodge Ram w/Integrated Controller
    Dodge says their integrated trailer brake controller is compatible with the electric over hydraulic brake systems, but we have found their compatibility to be hit and miss at best. There are a few things that can cause slow response in the trailer brakes. First make sure everything is wired correctly and that there are no weak or bad grounds. Grounds should be attached to clean and corrosion free bare metal surfaces. Make sure there is no corrosion in the vehicle and trailer side connectors.Wiring...
    view full answer...
  • Troubleshooting Integrated Brake Controller of 2015 Ram 5500 Not Working Well with EOH Brakes
    Integrated factory brake controller notoriously don't work well with electric over hydraulic actuators. If you let me know what brand of actuator you have I can see if there's an adapter that would work with it or you could always go to an aftermarket controller like the P2 # 90885 which will work very well with the actuator.
    view full answer...
  • Does HydraStart Vented Marine EOH Actuator HS381-8067 Include Breakaway Switch Battery?
    The HydraStar Vented Marine Electric Over Hydraulic Actuator for Disc Brakes - 1,600 psi # HS381-8067 you were looking at does not include the breakaway switch battery, so one must be purchased separately. This kit is compatible with a 5 amp hour breakaway battery kit like the Pro Series Push-To-Test Trailer Breakaway Kit with Built-In Battery Charger - Top Load # PS50-85-320. I included videos of the products mentioned for you to take a look at.
    view full answer...
  • Brake Controller/Break-Away System for Hydrastar Disc Brake Electric/Hydraulic Brake Actuator
    We don't offer an all-inclusive kit that offers everything you listed but I'd be happy to recommend some parts for you that would come pretty close, you'd need to get the brake controller and it's wiring harness separately. For a brake controller, you can't go wrong with a # C51140 Curt TriFlex. You'll also need the # C51451 wiring adapter harness which allows a plug and play installation into the junction box under the dash. This controller is out-of-the-box compatible with electric...
    view full answer...
  • Can Electric Over Hydraulic Brake Actuator Be Fully Submerged
    I spoke with my contact at Titan about the BrakeRite II # T4835700. He confirmed that they do not recommend completely submerging the BrakeRite. I also spoke with Dexter Axle to see if their Electric Over Hydraulic Brake Actuators, # K71-651, can be submerged. They confirmed that their actuators are not designed to be fully submerged. Though also not recommended to be submerged, the most likely contender to hold up to being fully submerged is the Hydrastar Marine Grade Electric...
    view full answer...
  • Replacement Filler Cap for Hydrastar HBA-BC Electric Over Hydraulic Disc Brake Actuator
    For the Hydrastar MHBA-16, which we refer to as part # HS381-8067 the proper replacement cap for the master cylinder is part # HBA-BC.
    view full answer...
  • Comparing the HydraStar Hydraulic Actuator and the Titan BrakeRite Hydraulic Actuator
    It looks like you have certainly done your research in regards to the HydraStar Electric Over Hydraulic Actuator and the Titan BrakeRite EHB Electric-Hydraulic Actuator. In regards to repose time, this goes to the Titan BrakeRite EHB with a response time of .3 seconds whereas the HydraStar Electric Over Hydraulic Actuator has a response time of .8 seconds. This is due to the five vs three piston pumps that each respective units use. In regards to the Titan BrakeRite EHB Electric-Hydraulic...
    view full answer...

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  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Jeff D
Installed by:
Jeff D
Employee Jacob T
Video Edited:
Jacob T
Employee Kathleen M
Video Edited:
Kathleen M
Employee Dustin K
Video by:
Dustin K
Employee Leah S
Edited by:
Leah S
Employee Amanda M
Written by:
Amanda M
Employee David F
Test Fit:
David F

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