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  1. Brake Actuator
  2. Demco
  3. Surge Brake Actuator
  4. Disc Brakes
  5. 2-5/16 Inch Ball Coupler
  6. 8000 lbs GTW
Demco Hydraulic Brake Actuator w/ Drop and Electric Lockout - Disc - Zinc - 2-5/16" Ball - 8K
Demco

Demco Hydraulic Brake Actuator w/ Drop and Electric Lockout - Disc - Zinc - 2-5/16" Ball - 8K

Part Number: DM8750311
In Stock
$409.13
Retail:$485.18
You Save: $76.05
Brake Actuator
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Surge actuator features a rustproof aluminum master cylinder and durable zinc plating. eZ-Latch coupler mechanism makes hookup a snap. Electric lockout activates automatically to keep brakes from actuating when in reverse. 5-Hole bolt-on case. 1-800-940-8924 to order Demco brake actuator part number DM8750311 or order online at etrailer.com. Free expert support on all Demco products. Great prices and Fastest Shipping for Demco Hydraulic Brake Actuator w/ Drop and Electric Lockout - Disc - Zinc - 2-5/16" Ball - 8K. Brake Actuator reviews from real customers.
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  • Reviews (143)
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Demco Brake Actuator - DM8750311

Highlights

  • Smooth, Controlled Braking: Surge actuator engages disc brakes automatically as you slow down.
  • Back Up Easily: Electric lockout keeps brakes from activating when reversing.
  • Quick, Secure Hookup: eZ-Latch drops onto a 2-5/16" ball and snaps closed automatically.
  • Built for Long Life: Zinc coating with 200-hour salt spray rating resists corrosion.
  • Perfect for Heavy Loads: Rated for 8,000 lbs GTW and 800 lbs maximum tongue weight.
  • Matches Hitch Height: 4" drop helps align trailer and tow vehicle for stable towing.
Made in USA

Features to know about

Easy Height Match: Built-In 4" Drop for Level Towing

Getting the right trailer height can make all the difference in stability and braking. The built-in 4" drop on this actuator helps line up your trailer perfectly with your tow vehicle so it rides level. That means better braking response and less strain on the hitch. It’s designed to bolt right onto a standard 3" wide tongue using five 1/2" x 4-1/2" Grade-5 bolts for a secure fit.

Smooth Braking Power: Aluminum Master Cylinder for Disc Systems

This surge actuator uses a heavy-duty aluminum master cylinder that’s both rustproof and efficient. It’s built for high-pressure disc brake applications and delivers up to 50 percent greater displacement than standard cylinders, giving you strong, responsive braking. The acetyl copolymer lining keeps everything moving smoothly as the actuator telescopes in and out, so braking feels steady instead of jerky.

No-Hassle Hookup: eZ-Latch Coupler on 2-5/16" Ball

Hooking up your trailer doesn’t get easier than this. With the eZ-Latch coupler, you just drop it over your 2-5/16" hitch ball and it locks automatically—no need to hold open the latch or secure it afterward. It’s a clean, one-handed connection that’s quick and solid every time you hitch up.

Close-up of Demco eZ-Latch coupler attached to a hitch ball, showing secure automatic latch mechanism for the Demco hydraulic brake actuator.

Reverse Without Drag: Built-In Electric Lockout Solenoid

Backing up used to mean fighting your trailer brakes, but not with this design. The built-in electric lockout solenoid automatically activates when you shift into reverse, preventing the brakes from engaging. It wires into your 5-pole flat, 6-way round, or 7-pole connector so you can move freely in reverse without any extra switches or manual steps.

Built to Last: Zinc Plating and Reinforced Steel Casing

Between road grime, rain, and salt water, corrosion can ruin an actuator fast—but not this one. The steel body has a durable zinc coating with a 200-hour salt spray rating, and even the master cylinder is rustproof aluminum. The sturdy reinforced casing adds extra durability for long-term use on heavy trailers rated up to 8,000 lbs GTW and 800 lbs tongue weight.

Specs

Application

  • Application: trailers with hydraulic disc brakes
  • Designed to bolt on top of a: 3" wide trailer tongue
  • Hardware: 1/2" x 4-1/2" Grade-5 bolts (not included)
  • Bolt pattern dimensions: See below

Dimensional diagram showing 5-hole bolt pattern and mounting measurements for Demco DA91 hydraulic brake actuator, illustrating spacing for proper trailer installation.

Coupler and Ball

  • Ball size: 2-5/16"

Weight and Capacity

  • Gross towing weight: 8,000 lbs
  • Maximum tongue weight: 800 lbs

Drop

  • Drop: 4"

Model and Warranty

  • Model number: DA91
  • Warranty: 1-Year warranty

8750411 Demco DA91 Hydraulic Trailer Brake Actuator for Disc Brakes - Electric Lock-Out - 2-5/16" Easy-Latch Drop Coupler - 8,000 lbs

Replaces Demco 8750311





Customer Satisfaction Score:

Ratings & Reviews

4.6

143 reviews
Review sort icon
Surge actuator features a rustproof aluminum master cylinder and durable zinc plating. eZ-Latch coupler mechanism makes hookup a snap. Electric lockout activates automatically to keep brakes from actuating when in reverse. 5-Hole bolt-on case.

by:

The hitch was replacing a 18 year old hitch that had rusted out. It fit the existing holes without having to drill them out. I'm restoring a 19 year old Grady White 232 Golfstream. I'm looking forward to seeing how well the breaking system works.



by:

Installed this on my boat trailer weighing in around 17,000 lbs total. ( boat and trailer) I have a long driveway with a slight incline and the electric lockout is terrible. While reversing the brakes would always engage and I would have to loosen the brake line with my flair wrench to complete my parking. I emailed e-trailer and they told me about the warranty process. It requires me to send in the faulty solenoid for them to inspect, and then deem if its covered or not. So I bit the bullet and just purchased another solenoid outright. Installed the solenoid and it worked fine with just the trailer, No boat on it. Once I loaded my boat onto the trailer, the brakes would lock as it did before. The solenoid was installed properly, to confirm this, I blocked both my truck and trailer tires. Put the truck in reverse and used a test light to verify 12v at the reverse light pin on my trailer light connection box.



by:

Good price and in time delivery.



by:

Found better pricing here, than any other place.



by:

Works great and even lined up with existing holes on my trailer.



by:

Great quality ,service,easy installation and fast shipping.



by:

Great product. Great service.
Thanks
etrailer!!



by:

- Unit as advertised, New and in good condition. Image of Actuator pictured on the web site had a "Stamped" coupler head but the one I received was the newer cast coupler head. This confused me for a bit but I found out from Demco that the cast coupler is the new style.
- Original identified delivery was to be Saturday, 6 SEP which was missed. Actual delivery was Tuesday, 9 Sep.
Very competitive price. Will definitely do business with etrailer.com again.



by:

Have had the actuator for about a year now, has been perfect, zero issues.I do recommend pulling the floating pins a grease with some marine grease to help with removal if you ever need to service the actuator



by:

Quality built unit that dropped for a perfect fit. Could not have been easier!



by:

Haven't installed yet, but superfast shipping! Love the features of the dropping on the ball with the hitch closed, and the addition of the solenoid lockout for reverse. This will replace the Titan 10 on my trailer now. Very happy with the quality of the unit. Joy was very helpful in the ordering process. Thanks



by:

Easy to install. Easy to bleed brakes manually and works perfectly



by:

After finishing my 4th and final boat trailer I purchased the hydraulic break actuator, Demco,12,500 lb. for 200.00+ cheaper than I could find anywhere, the etrailer staff helped with advise and follow-up; exceptional service.
51 years of commercial diving was all I work to restore now @ 80, but the spirit of the sport divers we work with, like this company, keeps me 'inspired', and I hope this inspires you too.



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Kurt profile picture

Kurt

4/24/2025

Great



by:

Though I received the item very quickly I have yet to install it. I doubt there will be any issues at this point. I would like to however praise this company for it’s great prices and quick shipping. I live in NE Ohio and I actually received the actuator in < 48 hrs from the time it was ordered. it arrived here at my home before or around Noon today 2 days after I first discussed doing business here. I plan to make other purchases from them soon. Great Service!!!



by:

Perfect fit easy install



by:

Product came and did not match picture of what was sold. It has a plastic lock. The new easy system. I didn’t want that plastic. I am very disappointed.

Live in Florida and plastic degrade quickly. I can imagine being on a trip and that plastic breaking. A metal latches for superior in my opinion.

Typically, I’m out of time for my trip and must use this crap.

Now I need to buy and carry a spare repair kit. What a pain.


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See what our Experts say about this Demco Brake Actuator

  • Replacement Actuator for Tie Down TDE LP8000
    The Demco Hydraulic Brake Actuator # DM8750311 can be used to replace your Tie Down Engineering LP8000 actuator. The Demco comes with an electric lockout like you are wanting. It is zinc coated for corrosion resistance and fits a 2-5/16" hitch ball. This actuator is made in the USA and fits 3" wide straight trailer tongues.
    view full answer...
  • DA91 Demco Disc Brake Actuator for 2-5/16 Hitch Ball with Electric Lockout Needed
    The DA91 Demco surge brake actuator that you are looking for is part # DM8750311. This has a 2-5/16" coupler, comes with an electric lockout, is designed for disc brakes, and has a weight capacity of 8,000 lbs towing and 800 lbs tongue weight.
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  • Is There a Reverse Lockout For Demco Disc Brake Actuator DM8758811
    Hi Jason, We do have a reverse lockout (and cover!) you can use with the Demco Hydraulic Brake Actuator w/ Drop # DM8758811, which is the Reverse Lockout Solenoid # DM11993 and Cover # DM11674-95. Another option - if you don't have the actuator yet - is to just get the actuator with the solenoid and cover already on it so you don't have to do any installation. For that you'd need the Demco Hydraulic Brake Actuator w/ Drop and Electric Lockout # DM8750311.
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  • Is there a Way to Replace Slide On Demco DA91 Disc Brake Actuator For No Coupler Drop?
    We do have the Replacement Inner Slide # DM12808-97 you could use with the Demco Trailer Coupler # DM15791-97 on your Demco Hydraulic Brake Actuator # DM8750311. This would allow you to position the coupler at several different heights to best level your trailer. Otherwise you would have to drill new holes for the Actuator # T4747220 which has a straight coupler out of the actuator.
    view full answer...
  • How to Use the Coiled Adapter 7-Way to 5-Flat Part # HM47025 with a Reverse Lockout Solenoid
    I assume you are referring to the reverse lockout solenoid wire and if that is the case then you would need to wire or check that the trailer side trailer connector has this wire on the far left pin which you can see in the attached photo of similar to the Hopkins Coiled Adapter 7-Way Flat Pin Blade to 5-Flat # HM47025. This pin should then match up with the reverse light circuit on your vehicle's 7-way.
    view full answer...
    Image 1 for
  • Does Demco Hydraulic Brake Actuator Come With Manual Lockout Option
    Hi Erik; the Demco Hydraulic Brake Actuator w/ Drop # DM8750311 only comes with an electric lockout. If you want a manual lockout as a backup you can add the Manual Reverse Lockout Kit # DM5939 since this is a DA91 actuator.
    view full answer...
  • Replacement Pontoon Boat Trailer Surge Brake Actuator With Drop Coupler
    I recommend using the Demco Hydraulic Brake Actuator w/ Drop and Electric Lockout # DM8750311. This actuator has a 4" drop that will help you attach to you truck without the need for such a large adjustable receiver. It will work with your single disc brake axle and features a electric reverse lockout like your current actuator. To this I recommend adding the Manual Reverse Lockout Kit # DM5939. This will allow you to disconnect the electrical and still ensure your brakes will remain...
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    Image 1 for
  • Replacement Options For Tie Down Engineering LP8000 Disc Brake Actuator
    There are a couple options to replace the 8,000 lb TDE LP8000 disc brake actuator (though not just the inner member). One is from Dexter and the other Demco: - Demco Hydraulic Brake Actuator w/ Drop and Electric Lockout - Disc # DM8750311 - Dexter Zinc-Plated Brake Actuator w/ Electric Lockout - Disc # T4747220 Both attach to a 2-5/16" hitch ball and fit a 3" wide trailer tongue; the biggest difference is the Demco gives you a built-in 4" drop while the Dexter does not.
    view full answer...
  • Replacement Hydraulic Brake Actuator For Tie Down Engineering LP8000
    The Demco Hydraulic Brake Actuator # DM8750311 can be used to replace your Tie Down Engineering LP8000 actuator. The Demco comes with an electric lockout like you are wanting. It is zinc coated for corrosion resistance and fits a 2-5/16" hitch ball. This actuator is made in the USA and fits 3" wide straight trailer tongues.
    view full answer...
  • How To Bleed The Brakes With A Demco Hydraulic Brake Actuator DA91
    To bleed the brake lines with your Demco Hydraulic Brake Actuator w/ Drop and Electric Lockout # DM8750311 you'll need to complete the following steps: 1. First raise the tongue of the trailer 4" to 6". 2. Loosen or remove two 5/16” bolts that hold the lever guide and flat emergency lever spring. 3. Remove the master cylinder fill cap. 4. Using short strokes, pull forward on emergency lever, pumping master cylinder until brake fluid in master cylinder reservoir stops bubbling. 5....
    view full answer...
  • Are Replacement Parts Available for a Tie Down Engineering LP8000
    The Tie Down Engineering LP8000 actuator isn't something we have direct replacement parts for. While we do have replacement solenoids and rebuild kits for some of the actuators we carry, I have no way of verifying whether this will fit your actuator so I recommend replacing the entire actuator to something that's still in production so you can get replacement parts easier in the future. For your application I recommend going with the Demco Hydraulic Brake Actuator w/ Drop and Electric...
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  • Mounting Hole Dimensions of Demco DA91 Surge Brake Actuator
    I attached a picture that shows all of the mounting hole dimensions pointed out as well as a second picture that shows the distance from the front mounting hole to rear of shroud on the Demco DA91 # DM8750311 you referenced.
    view full answer...
    Image 1 for Image 2 for
  • Best Replacement Options for TDE LP8000 Surge Brake Actuator (3" Tongue, 8K Trailer)
    Hi Jim, the honest answer is that there isn’t a direct replacement or rebuild kit still available for the TDE LP8000, so the right path forward is to replace the entire actuator, which typically means cutting the old one off and installing a new unit. For a true replacement, you’ll want to match your brake type, and for drum brakes a really solid modern equivalent is the Dexter Zinc-Plated Brake Actuator part # T4079200, and if your trailer has disc brakes then the Demco Hydraulic Brake...
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  • Recommended Hardware for Installing Demco Brake Actuating Coupler
    The Demco Hydraulic Brake Actuator w/ Drop and Electric Lockout - Disc - Zinc - 2-5/16" Ball - 8K # DM8750311 has 5 holes for adjustability and fit with the majority of couplers. The weight rating is based on utilizing all of the bolt holes to secure a coupler of this size. It is recommended to use five 1/2" x 4-1/2" Grade-5 bolts which are not included. Unfortunately we don't have those bolts but your local hardware store will have them readily available.
    view full answer...
  • Can Demco Hydraulic Brake Actuator Electric Lockout # DM8750311 be Used on Tandem Axle Trailer
    Yes, the Demco Hydraulic Brake Actuator w/ Drop and Electric Lockout # DM8750311 will easily handle 4 brake assemblies like what a tandem axle trailer has.
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Do you have a question about this Brake Actuator?


Info for this part was:

Employee Leah B
Edited by:
Leah B
Employee Lindsey S
Written by:
Lindsey S
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Jeff D
Installed by:
Jeff D
Employee Steven C
Installed by:
Steven C
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Carrie F
Updated by:
Carrie F
Employee Dustin K
Video Edited:
Dustin K

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