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  1. Brake Actuator
  2. Demco
  3. Surge Brake Actuator
  4. Disc Brakes
  5. 2 Inch Ball Coupler
  6. 8000 lbs GTW
Demco Hydraulic Brake Actuator w/ Drop - Disc - Zinc - 2" Ball - 8,000 lbs

Demco Hydraulic Brake Actuator w/ Drop - Disc - Zinc - 2" Ball - 8,000 lbs

Item # DM8669113
Our Price: $334.18
Brake Actuator
Shipping Weight: 41 lbs
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Surge-type actuator features a corrosion-resistant composite master cylinder and durable zinc plating with a 200-hour salt spray rating. eZ-Latch coupler mechanism makes hookup a snap. Bolt-on application. 1-800-940-8924 to order Demco brake actuator part number DM8669113 or order online at Free expert support on all Demco products. Great prices and Fastest Shipping for Demco Hydraulic Brake Actuator w/ Drop - Disc - Zinc - 2" Ball - 8,000 lbs. Brake Actuator reviews from real customers.
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  • Reviews (7)
  • Q & A (0)
  • Photos

Demco Brake Actuator - DM8669113

  • Surge Brake Actuator
  • Disc Brakes
  • 2 Inch Ball Coupler
  • 8000 lbs GTW
  • Bolt-On
  • No Lockout
  • Straight Tongue Coupler
  • Demco

Surge-type actuator features a corrosion-resistant composite master cylinder and durable zinc plating with a 200-hour salt spray rating. eZ-Latch coupler mechanism makes hookup a snap. Bolt-on application.


  • Hydraulic actuator activates trailer's brakes when tow vehicle slows or stops
  • eZ-Latch coupler mechanism for simple, secure hookup and disconnect
    • Lets you hook up when latch is in closed position - just drop coupler over hitch ball and latch will snap into place
  • Composite master cylinder is durable and efficient
    • Glass-reinforced nylon construction resists rust and corrosion
    • Large reservoir provides increased capacity for brake fluid
    • Automotive-style diaphragm cap creates completely enclosed system to help prevent contamination of fluid
  • Acetyl copolymer lining provides smooth operation as actuator telescopes in and out
  • Built-in drop helps you match tow vehicle height
  • Breakaway included
    • Snap hook on safety cable ensures secure connection to breakaway lever
  • Heavy-duty steel construction
  • Zinc plating offers corrosion resistance
    • 200-Hour salt spray rating
  • Bolt-on installation
    • Requires 1/2" x 4-1/2" Grade 5 bolts (not included) for mounting
  • Made in the USA


  • Application: trailers with hydraulic disc brakes
  • Ball size: 2"
  • Gross towing weight: 8,000 lbs
  • Maximum tongue weight: 800 lbs
  • Mounting: straight, 3" wide trailer tongue
  • Drop: 4"
  • Model number: DA91
  • 1-Year warranty

Note: This actuator is compatible with the Demco manual reverse lockout kit (DM5939). If you choose not to add the 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.

When you apply the brakes in your tow vehicle, deceleration occurs and momentum pushes your trailer toward the rear of your vehicle. With surge brake systems, the hydraulic actuator is triggered as your trailer moves forward, once your tow vehicle starts to slow down. When this happens, the actuator contracts, applying force to its master cylinder. This in turn supplies the necessary hydraulic pressure to engage your trailer's brakes.

eZ-Latch Coupler

The coupler portion of this trailer brake actuator features a simple-to-use latching mechanism known as the eZ-Latch. With this mechanism, hooking up is as easy as dropping the coupler over your trailer hitch ball. The latch does not need to be tugged or manually activated to allow the ball into the coupler socket, nor does it have to be secured in place. Just make sure that the coupler is properly lined up with the ball when you lower it, and the rest is automatic.

Demco eZ-Latch in Use

Sturdy, Corrosion-Resistant Construction

Made of sturdy steel, this hydraulic trailer brake actuator features a durable zinc coating that is designed to limit rust and corrosion. This zinc coat has a 200-hour salt spray rating. In addition, the composite master cylinder is made of corrosion-resistant glass-reinforced nylon to further ensure durability.

8669113 Demco DA91 Hydraulic Trailer Brake Actuator for Disc Brakes - 2" Ball Easy-Latch Drop Coupler - 8,000 lbs

Customer Satisfaction Score:

Customer Reviews

Demco Hydraulic Brake Actuator w/ Drop - Disc - Zinc - 2" Ball - 8,000 lbs - DM8669113

Average Customer Rating:  4.9 out of 5 stars   (7 Customer Reviews)

Surge-type actuator features a corrosion-resistant composite master cylinder and durable zinc plating with a 200-hour salt spray rating. eZ-Latch coupler mechanism makes hookup a snap. Bolt-on application.


The products I received were of good quality and were bolt on replacement for what was originally on my trailer. Very pleased.

Joe S.


The brake actuator is still working properly


everything worked just as advertised. installation was pretty striate forward. I had to make a few changed to hydraulic lines but all worked fine.


Needed this product ASAP to fix a trailer that needed to be back on the road. Received on time as promised and worked amazingly well. Thank you so much for saving my butt! Keep up the great work!


Correct part, easy to install. Great quality! Helpful staff to determine what I needed!

Ken B.


Working perfectly.





See what our Experts say about this Demco Brake Actuator

  • Recommended Replacement for Tie Down Engineering (TDE) Brake Actuator 48980
    The Tie Down Engineering (TDE) Brake Actuator 48980 also known as the 80LP/85LP is a 8,000 lb or 8,500 lb disc brake actuator with 2" coupler. In order to replace this, the best option we have is the Demco Hydraulic Brake Actuator part # DM8669113 which is rated for use with disc brakes, has an 8,000 lb weight capacity, and uses a 2" hitch ball. It also has a built-in drop which helps you match the tow vehicle height better.
    view full answer...
  • What Would Cause Demco Tow Dolly to Sway When Unloaded
    What dolly do you have that sways when unloaded? If it's a Demco you'll need to insert the pin that defeats the auto steer feature that allows the dolly to track behind the tow vehicle better.
    view full answer...
  • Dimensions of Demco Hydraulic Brake Acutator with Drop
    The Demco Hydraulic Brake Actuator # DM8669113 will hang over the sides of the tube with the mounting plates 2-1/8" on each side and the channel of the actuator is 15-1/4" long. The overall dimensions on the coupler are 7-3/4" tall x 29" long x 4-1/2" wide. I've attached a photo with the dimensions to this answer.
    view full answer...
    Image 1 for
  • Trailer Tongue Length Required to Install Demco Hydraulic Brake Actuator
    I reached out to a representative of Demco who told me that the outer case of the Demco Hydraulic Brake Actuator # DM8669113 needs 18" of space on the trailer tongue to bolt on. Additionally, you will need between 2" and 4" of clearance behind the actuator to get the brake line attached to the master cylinder. You will need only 2" if you have a pre-bent brake line/hose with a 90 degree fitting or 4" if you have a straight hose or hard line that needs to make the 90 degree bend.
    view full answer...
  • How to Fix Swaying Demco DM8669113 Kar Kaddy SS Tow Dolly
    Demco doesn't sell the Acetyl copolymer lining used in their # DM8669113 brake actuator as a separate item. I spoke with my Demco representative who said that the lining wouldn't have any influence on a swaying # DM9713045 Kar Kaddy SS car dolly. The lining's purpose is to allow the brake actuator to move smoothly back and forth so it wouldn't have any affect on the tow dolly swaying. Is this occurring with the tow dolly empty? Demco tells me that when towing empty, you'll need to insert...
    view full answer...
  • Electric Reverse Lock Out Solenoid Recommendation for DA91 Demco Actuator
    Yes, all you need to add an electric lockout to your Demco DA91 Actuator part # DM8669113 is the solenoid part # DM5404.
    view full answer...
  • Manual Lock Out Disc Brake Actuator Rated for 7k and for 2 inch Ball
    We have the Demco Disc Brake Actuator part # DM8669113 which fits a 2 inch ball and can be manually locked out with the part # DM5939. This has an 8k capacity and is only option that covers everything you are looking for.
    view full answer...
  • Is There a Disc Brake Trailer Actuator with Manual Lockout
    The Demco Hydraulic Brake Actuator part # DM8669113 for 2" or part # DM8758811 for 2-5/16" are the only disc brake actuators we have that can be manually locked out using the Manual Reverse Lockout Kit for Demco Hydraulic Trailer Brake Actuators part # DM5939. They both have a 8,000 lb weight capacity and come with the eZ-Latch coupler mechanism so they should work well for you.
    view full answer...
  • Replacement for a TDE LP8500 Boat Trailer Acuator
    We don't offer an 8500 lb rated surge coupler, but we might have options that would work for you. If the GVWR (weight of trailer plug boat) is 8000 lbs or less, I'd recommend the Demco item # DM8669113 if your trailer has disc brakes or item # DM8669112 for a drum brake aactuator.
    view full answer...
  • Using an Electric Trailer Brake Controller With Boat Trailer Hydraulic Brakes
    The 2012 BMW X5 has a rated towing capacity of 6000-lbs according to my research and for this vehicle we offer several Class III hitches (viewable on the link provided) that share this same maximum towing capacity, along with a tongue weight limit of 600-lbs. Note that these hitches do not fit the M model. You'll want to be sure that your fully-loaded boat/trailer does not exceed the towing or tongue weight capacities of either the vehicle or the hitch (your hitch should have a sticker...
    view full answer...
  • Troubleshooting Disc Brakes with Aero-6000 on Four Winns Boat Trailer Dragging/Overheating
    The #17 nut that you are referring to for your Aero-6000 actuator (similar to part # T63FR) looks like it simply helps to keep the latch in place. If you are having problems with your brakes dragging and overheating then either your disc brakes/caliper need to be cleaned, your breakaway cable has been activated, or the internal components of your actuator are needing replacement. If you check your brakes/calipers and breakaway cable isn't activated then the only internal components that...
    view full answer...
    Image 1 for
  • What Actuator is Needed for Hydraulic Disc Brakes with 1,500 psi Rating Requirement
    Great question! You are correct that disc brakes, like part # K2HR526D, for your 5,200 - 6,000 lb trailer (or for any trailer for that matter) require a surge brake actuator with at least a 1,500 psi rating. The good news is that all of our hydraulic actuators that are designed for disc brakes, like the Demco # DM62VR, are rated for at least 1,500 psi so you're good to go on that end. Since you're only using the boat for fresh water you don't have to be as concerned about corrosion, but...
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  • Trailer Hub for 3,500 lb Axle That Has 5 on 5 Bolt Pattern
    There are idler hubs as well as hub and drums with a 5 on 5" bolt pattern for a 3,500 lb axle: - Trailer Hub and Drum Assembly # AKHD-550-35-K (Standard Spindle) or # AKHD-550-35-EZ-K (E-Z Lube Spindle) - Trailer Idler Hub Assembly # 84550BX (Standard Spindle) or # 84550UC1-EZ (E-Z Lube Spindle) These will work so long as you have inner bearing L68149, outer bearing L44649 and grease seal 58846. They all have a 5 on 5" bolt pattern and are pre-greased for your convenience. I have added...
    view full answer...

Do you have a question about this Brake Actuator?

Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Lindsey S
Written by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Laura H
Updated by:
Laura H

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