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Demco Hydraulic Brake Actuator w/ Drop - Drum - Zinc - 2-5/16" Ball - 8,000 lbs
(57 reviews)
Price: $343.86
In Stock
Demco
Demco Hydraulic Brake Actuator w/ Drop - Drum - Zinc - 2-5/16" Ball - 8,000 lbs
Part Number: DM8759411
In Stock
$343.86
Retail:$426.32
You Save: $82.46
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- All Info
- Reviews (57)
- Q & A (0)
- Photos
Demco Brake Actuator - DM8759411
Highlights
- Quick Hookup Every Time: eZ-Latch drops right on your 2-5/16" ball and locks automatically.
- Strong for Heavy Towing: Rated for 8,000 lbs GTW and 800 lbs tongue weight for secure stopping power.
- No Brake Controller Needed: Surge design activates drum brakes as your tow vehicle slows.
- Perfect for Use Around Water: Zinc finish with 200-hour salt spray rating resists rust and corrosion.
- Built to Last: Composite master cylinder with glass-reinforced nylon resists wear and contamination.
- Easy Bolt-On Fit: Mounts on top of a 3" trailer tongue using standard 1/2"x4-1/2" bolts.
Features to know about
Easy Hookups: eZ-Latch Coupler Mechanism
Getting your trailer connected couldn’t be simpler. The eZ-Latch coupler lets you just drop the 2-5/16" ball into place without having to hold or tug on the latch. Once it’s lined up, the latch snaps shut automatically for a solid, secure fit. It takes the hassle out of hitching up and makes disconnects just as quick when it’s time to unhook.
Strong Braking Power: Surge-Type Actuator for Drum Brakes
This hydraulic actuator activates your trailer’s drum brakes automatically when you slow down or stop—no brake controller needed. The momentum of the trailer pushes the actuator in, pressurizing the composite master cylinder and sending smooth, even braking power to your wheels. With an 8,000 lb gross towing weight and 800 lb maximum tongue weight rating, it’s built to handle heavy loads confidently.
Built to Last: Zinc-Plated Steel with 200-Hour Salt Spray Rating
The heavy-duty steel housing has a durable zinc coating that stands up to corrosion and harsh weather. It’s rated for 200 hours of salt spray protection, making it well suited for boat trailers and anyone towing in wet or salty conditions. Inside, a glass-reinforced nylon master cylinder won’t rust or pit, so the braking system keeps working smoothly trip after trip.
Smooth Operation: Composite Master Cylinder with Sealed System
The large reservoir holds more brake fluid to help prevent running low on long hauls. A diaphragm-style cap seals the system completely to keep out moisture and debris that can contaminate fluid. An acetyl copolymer liner inside the actuator provides a low-friction surface so it telescopes in and out easily during stops and starts.
Practical Fit: 4" Drop and Bolt-On Mounting for 3" Tongues
With a built-in 4" drop, this design helps line up the coupler height with different trailer setups. It bolts right onto a 3"-wide tongue using three mounting holes—1/2" x 4-1/2" Grade-5 bolts (not included)—and includes a breakaway cable with snap hook for safety. It’s a straightforward solution that replaces older surge units cleanly without extra parts or welding.
Specs
Application
- Application: trailers with hydraulic drum brakes
- Designed to bolt on top of a trailer tongue: 3" wide
- Bolts required: 1/2" x 4-1/2" Grade-5 bolts (not included)
- Additional info: See below for bolt pattern dimensions
Weight and Capacity
- Gross towing weight: 8,000 lbs
- Maximum tongue weight: 800 lbs
Dimensions
- Drop: 4"
Coupler Information
- Ball size: 2-5/16"
Model Information
- Model number: DA91
- Warranty: 1-Year warranty
Note
- Recommendation: Because this actuator does not include a reverse lockout, it is recommended that you equip your trailer with free-backing brakes so that you can drive in reverse without the actuator triggering your trailer's brakes.
8759411 Demco DA91 Hydraulic Trailer Brake Actuator for Drum Brakes - 2-5/16" Ball Easy-Latch Drop Coupler - 8,000 lbs
Customer Satisfaction Score:
98% were satisfied with this product
2% of customers were not satisfied
- Product did not meet expectations
Ratings & Reviews
4.9
57 reviews
by:
Justin
05/03/2020
Used this for a homemade dump trailer.
Found it was best to use a skid steer to bleed the system, move the tongue in. Then have a chain to back out. 2 person job.
Overall good product. Brakes work great! Plan on making a cover for the reservoir tank.
Found it was best to use a skid steer to bleed the system, move the tongue in. Then have a chain to back out. 2 person job.
Overall good product. Brakes work great! Plan on making a cover for the reservoir tank.
by:
Nate
01/24/2021
This was an exact replacement for my 25 year old hitch! So glad they have so many choices, very helpful and a perfect fit
by:
Gerry O.
08/30/2017
I live on a farm where it seems we're always fixing trailers or building trailers for use. I have bought several hitches from etrailer and they have ALWAYS been helpful. Great selection to choose from also. Recommend them highly.
by:
Kevin B
09/11/2020
Excellent product and it’s working great !!!!
Kevin B.
9/12/2021
Working great !!!
by:
Ryan
09/03/2022
Nice coupler, however packaging is very insufficient and has been dropped where brake line threads, threads were damaged in the master cylinder and the brass adapter to the hose is bent. The packaging only has a couple pieces of shipping paper in it, not near enough to prevent shipping damage
by:
Harry
08/04/2020
Bolted in place of the old one with minor drilling. Easy to bleed the system and works great.
by:
Rob
07/06/2026
by:
Wes
07/22/2024
Awesome service
by:
Donald
08/13/2021
Solid construction and good design
by:
Greg
09/01/2023
Ordering was simple, delivered very quickly. Great job, guys.
by:
Brent
09/27/2022
by:
Ricky
09/16/2026
by:
Floyd
06/02/2025
by:
Jessie
05/17/2021
by:
Chelsea
12/27/2023
by:
Susan
09/27/2023
by:
Stephen
06/24/2026
Nice hardware and fantastic customer service Nicole was very knowledgeable and helpful!
by:
Donald
04/30/2026
Fast and exact replacement part, 300 bucks less that the local trailer parts store, A1 ++++
by:
Chris
05/21/2024
Easy install excellent product
Chris
5/22/2025
Excellent
by:
Mike
12/14/2025
Quality of the parts is good. Fit was good. Assembly quality was poor. Missing the cotter pin for the damper end pin . Brake fluid outlet fitting was loose.
by:
Vance Rosling
06/22/2026
Excellent quality, very sturdy construction and excellent service.
by:
Don
10/29/2025
great customer service and quality product.
by:
Pat
01/28/2023
hello it's not to my address yet but i will call when i get it also do you have pindel surge hitch if so show me thanks
Jenny N.
2/1/2023
We do have pintle actuators available. For example part # DM8202022 or part # DM8202152.
by:
Randy H
01/25/2017
Had a hard time trying to find this product, but E trailer was able to provide me with great service and found the trailer hitch I needed for my trailer.
by:
Eric
09/10/2021
Hitch arrived early and looks just like the picture and description. It is an exact replacement for the original. All the parts are available to rebuild the unit as well but mine was rusted pretty badly so I would have had a lot of time refinishing everything I didn't replace. In my situation there was about a $50 difference between rebuilding old or complete new unit. If your hitch is in better shape than mine, they have an excellent selection of repair parts. I would suggest taking yours apart and as long as it's not rusted solid, they can probably supply you with parts for less than $70.
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Info for this part was:
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Written by:
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Installed by:
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Expert Research:
Jameson C
Updated by:
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Updated by:
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Video Edited:
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Nate
1/25/2022
Fine - I don’t use the brakes - just the tongue as that is the same model that was on there before