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

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

Item # DM8669112

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Brake Actuator

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Demco 2 Inch Ball Coupler Brake Actuator - DM8669112
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  • Surge Brake Actuator
  • Drum Brakes
  • 2 Inch Ball Coupler
  • 8000 lbs GTW
  • Demco
  • Bolt-On
  • No Lockout
  • Straight Tongue Coupler
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. Call 800-298-8924 to order Demco brake actuator part number DM8669112 or order online at etrailer.com. Free expert support on all Demco products. Guaranteed Lowest Price and Fastest Shipping for Demco Hydraulic Brake Actuator w/ Drop - Drum - Zinc - 2" Ball - 8,000 lbs. Brake Actuator reviews from real customers.


  • All Info
  • Reviews (1)
  • Q & A (6)
  • Videos (1)
  • Photos
  • Why etrailer?

Demco Brake Actuator - DM8669112

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.


Features:

  • 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


Specs:

  • Application: trailers with hydraulic drum 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.



8669112 Demco DA91 Hydraulic Trailer Brake Actuator for Drum Brakes - 2" Ball Easy-Latch Drop Coupler - 8,000 lbs







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


Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Demco Brake Actuator - Surge Brake Actuator - DM8669112 Review

Speaker 1: Today we're gonna take a look at Demco bolt on hydraulic drum brake actuator with the 4" drop, 2" ball coupler and an 8,000 pound capacity. Now this hydraulic actuator will activate your trailer brakes when your tow vehicle slows or stops. Basically, when you apply the brakes in your two vehicle, deceleration occurs and the momentum will push your trailer toward the rear of your vehicle and with the surge brake systems, the actuator's triggered as your trailer moves forward once your tow vehicle starts to slow down. So when this happens, the actuator will contract, applying force to the master cylinder and this in turn supplies the necessary hydraulic pressure to engage your trailer brakes. The master cylinder right here in the back is a composite master cylinder. It's very durable and efficient.

It's a glass reinforced nylon construction to help resist rust and corrosion. It has a very large reservoir to provide increased capacity for your brake fluid and if you notice on the top of the actuator here, they use an automotive style of diaphragm cap, which will create a completely enclosed system to help prevent contamination of the brake fluid.On the inside of this actuator, they use an inaudible 00:01:04 lining, provides a nice, smooth operation as this actuator will telescope in and out. Now this coupler does use an easy latch coupler mechanism for a nice, simple, secure hookup and disconnect. Basically, it'll let you hook up when the latch is in the closed position, like it is now. All you have to do is just drop the coupler over the hitch ball and the latch will snap into place and I wanted to show you that I happen to pull a 2" hitch ball and just to show you, it's in the closed position.

You don't have to do any opening of it. So if you raise this up, drop it onto the ball and you can see once it drops onto the ball it'll automatically latch it into place and you're all ready to go and then to remove it, just pull on this latch at the bottom here. Open it up and it'll allow you to move it from the bottom. So it's a very simple installation. It does have the built in drop on the coupler.You can see it helps match your two vehicle height.

The breakaway right here is included. You can see it has the snap hook on this long safety cable to ensure secure connection to the breakaway lever. Basically, what your breakaway does is this will hook to the tow vehicle and in the case where your trailer will come disconnected from your tow vehicle, it'll pull this cable which will activate the lever and apply the brakes on the trailer to prevent a runaway situation. This is a heavy duty steel construction. It has a nice zinc plating to offer corrosion resistance.

It meets a 200 hour salt spray rating. This is a bolt on installation. You can see it is designed to mount to straight 3" wide trailer tongue. It does require a 1/2" by 4 1/2" grade five bolts. They are not included to install it. This part is made in the USA. A few specs on this, the application is for trailers with hydraulic drum brakes. The ball size we mentioned it sits on is a 2" diameter ball. Gross towing weight capacity is 8,000 pounds. Maximum tongue weight is 800 pounds.The drop is 4" and this actuator does go by the mile number of VA91. But that should do it for the review on the Demco bolt on hydraulic drum brake actuator with the 4" drop, 2" ball coupler and an 8,000 pound capacity.


Customer Reviews

Demco Hydraulic Brake Actuator w/ Drop - Drum - Zinc - 2" Ball - 8,000 lbs - DM8669112

Average Customer Rating:  5.0 out of 5 stars   (1 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.

- DM8669112
by:

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. 335274


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Ask the Experts about this Demco Brake Actuator
Do you have a question about this Brake Actuator?


  • Adding Manual Lockout to Surge Brake Actuator
  • The reason there are different actuators for disc brakes and drum brakes is the psi the brakes operate at. Disc brakes operate at a higher psi than drum brakes and either too much or too little pressure can cause damage to the brakes. There are units that can have manual reverse lockouts installed but not all.
    view full answer...

  • Bolt Hole Dimensions Of Demco Brake Actuator # DM8669112
  • The mounting holes of the Demco Hydraulic Brake Actuator w/ Drop - Drum - Zinc - 2" Ball - 8,000 lbs # DM8669112 are in the same exact locations as you mentioned. From front bolt to second bolt center to center is 3 inches. From the front bolt to the rear bolt center on center is 12-1/2 inches. This bolt-on installation requires 1/2 inch by 4-1/2 inch Grade 5 bolts that are not included. I've attached a photo to help.
    view full answer...

  • How to Bleed Brakes with Demco Hydraulic Brake Actuator
  • I have attached an image from the operation manual for the Demco Hydraulic Brake Actuator # DM8669112 that details how to bleed the brakes. The process consists of first elevating the trailer tongue about 4 to 6 inches and then loosening or removing the two 5/16" bolts that hold the lever guide and emergency lever spring and removing the master cylinder fill cap. You will want to use short strokes to pull the emergency lever forward, pumping the master cylinder until the brake fluid...
    view full answer...

  • Replacement Brake Actuating Coupler for Upgrade to Disc Brakes
  • The bolt hole dimensions of the Demco Brake Actuator # DM8669112 are 12-1/2 inches on center and 3 inches on center. I've attached a photo to assist. The Titan # T4747220 has mounting holes that are 3 inch on center so 2 of the 3 holes will align with your current coupler. Instead of changing out your entire coupler, you may want to simply change out your master cylinder on your Demco Actuator using the Replacement Master Cylinder for Demco Actuators - Disc Brakes # 5672. This...
    view full answer...

  • Recommended Replacement Coupler for Atwood 83000 Surge Brake Actuator Coupler
  • The Atwood 83000 was a 8,000 lb drum brake actuator for a 2 inch hitch ball that has been discontinued. For a replacement I recommend the Demco Hydraulic Brake Actuator w/ Drop - Drum - Zinc - 2" Ball - 8,000 lbs # DM8669112. The only other option for that 8,000 lb capacity is a channel mount like the Demco Hydraulic Brake Actuator - Drum - Zinc - 8" Adjustable Channel Down - 8,000 lbs # DM8759131 which will allow you to use a coupler like the Demco Trailer Coupler - Adjustable Channel...
    view full answer...

  • How to Determine the Correct Replacement Brake Assembly Size for a 6,000-lb Axle
  • You can determine what the correct replacement brake assembly is by measuring the diameter of the brake assembly. This is measured from one brake pad directly across to the other brake pad. This is demonstrated at the 2:05 mark of the attached review video for our Electric Trailer Brake Kit # AKEBRK-7-SA that should be what you are needing for your application. This kit measures 12" x 2" and is compatible with 5.2K to 7K axles. This kit also comes with both the right and left hand assemblies. If...
    view full answer...


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Info for this part was:

Written by:
Lindsey S
Installed by:
Jeff D
Updated by:
Laura H
Photos by:
Jeffrey L

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