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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 - Disc - Zinc - 2-5/16" Ball - 8,000 lbs

Demco Hydraulic Brake Actuator w/ Drop - Disc - Zinc - 2-5/16" Ball - 8,000 lbs

Item # DM8758811
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Brake Actuator
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Demco Bolt-On Brake Actuator - DM8758811
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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. 1-833-496-1390 to order Demco brake actuator part number DM8758811 or order online at Free expert support on all Demco products. Guaranteed Lowest Price and Fastest Shipping for Demco Hydraulic Brake Actuator w/ Drop - Disc - Zinc - 2-5/16" Ball - 8,000 lbs. Brake Actuator reviews from real customers.
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  • Reviews (9)
  • Q & A (0)
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Demco Brake Actuator - DM8758811

  • Surge Brake Actuator
  • Disc Brakes
  • 2-5/16 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
  • Acetal 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: 2-5/16"
  • 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.

8758811 Demco DA91 Hydraulic Trailer Brake Actuator for Disc Brakes - 2-5/16" Ball Easy-Latch Drop Coupler - 8,000 lbs

Customer Reviews

Demco Hydraulic Brake Actuator w/ Drop - Disc - Zinc - 2-5/16" Ball - 8,000 lbs - DM8758811

Average Customer Rating:  4.9 out of 5 stars   (9 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.


Order part and came in a timely matter. This is the second time ordering this for 2 trailers and no complaints. Thank you.


Thanks!! What a great experience with Trailer needed many parts, rusted, broken etc. Tried to contact maker of trailer for replacement parts, bad experience. Rude, unwilling to help, handling fees, VERY expensive shipping, and cash up front. I then turned to! Fantastic people on the line, sales personal were Kind, patient, and very knowledgeable about all my trailer needs. My parts arrived quickly, free shipping, and accurate. Not to mention I saved a bunch of money!!!! New Break System from front to back, new Trailer Winch. Thanks, Customer for life!


Grteat Service and fast shipping


very little use so far but all is working good I am very happy with my purchase




Good Item





See what our Experts say about this Demco Brake Actuator

  • Does Demco Hydraulic Brake Actuator DM8758811 For Disc Brakes Work With Tandem Axle Trailer
    Yes, a tandem axle trailer with disc brakes is absolutely going to be compatible with the Demco actuator you mentioned: - Demco Hydraulic Brake Actuator # DM8758811 This actuator will bolt right onto a 3" wide trailer tongue for an easy install, has an 8,000 lb capacity, and will latch onto a 2-5/16" inch trailer hitch ball. I have added a link below to a video review for you to check out as well if you'd like to take a look.
    view full answer...
  • Can the Demco DM8758811 Replace Hydraulic Brake Actuator for 2 Inch Ball With 6,600 Pound GTW
    Yes, you can replace your current brake actuator with the Demco Hydraulic Brake Actuator w/ Drop - Disc - Zinc - 2-5/16" Ball - 8,000 lbs # DM8758811. When selecting a brake actuator you must select one that meets or exceeds the GTWR of the trailer. Assuming you have a 3" wide trailer tongue and the 4" drop works for you, this will work well as a replacement. Keep in mind, this is designed for disc brakes. If you have hydraulic drum brakes you will want the # DM8759411 instead. I have...
    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...
  • 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.
    view full answer...
    Image 1 for
  • Replacement Brake Actuator for Global Direct GDC-80 Brake Actuator
    We have the perfect replacement for your Global Direct GDC-80 brake actuator. Since you mentioned "down tongue" I believe you were referring to having an actuator with drop. If you have disc brakes, the best option is the Demco Hydraulic Brake Actuator w/ Drop - Disc # DM8758811 and if you have drum brakes the best option is the Demco Hydraulic Brake Actuator w/ Drop - Drum # DM8759411. Both of these actuators have a 4" drop, are compatible with a 2-5/16" hitch ball, have an 8,000 lb capacity...
    view full answer...
    Image 1 for
  • Replacement for Titan Model 6 Trailer Brake Actuator
    That is a great photo, thank you; and while there are certain repair parts available for a Titan Model 6, I recommend replacing it altogether. The reason for this is the corrosion looks to have taken its toll on the actuator, and is at the point where a replacement makes the most sense in terms of safety and value. The Titan Model 60 is still a good option, and the right one will depend on if you have disc or drum brakes: - Disc Brakes: Titan Zinc-Plated Brake Actuator - Disc - 2-5/16"...
    view full answer...
    Image 1 for
  • Replacement For 6k - 8k Atwood Disc Brake Actuator
    Atwood is no longer in business, and the part number you asked about has unfortunately been discontinued, so it is no longer available. While I know it's not the answer you were looking for, the best option is a replacement for your Atwood actuator for disc brakes, and you can choose from the hitch ball size you need to couple to as well as the weight rating. Based on my research it looks like that master cylinder was for 6k to 8k rated actuators, so you can choose from any of the following...
    view full answer...
  • 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...
    view full answer...

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Info for this part was:

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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