1. Brake Actuator
  2. Demco
  3. Surge Brake Actuator
  4. Disc Brakes
  5. 2 Inch Ball Coupler
  6. 8600 lbs GTW
Demco Hydraulic Brake Actuator w/ Electric Lockout - Disc - Zinc Plated - 2" Ball - 8,600 lbs

Demco Hydraulic Brake Actuator w/ Electric Lockout - Disc - Zinc Plated - 2" Ball - 8,600 lbs

Item # 8608611
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Brake Actuator
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8608611 - 8600 lbs GTW Demco Brake Actuator
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Surge-type actuator features easy-to-use eZ-Latch coupler mechanism, a corrosion-resistant composite master cylinder, and durable zinc plating. Electric reverse lockout activates automatically to keep trailer brakes from actuating when in reverse. Call 800-298-8924 to order Demco brake actuator part number 8608611 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/ Electric Lockout - Disc - Zinc Plated - 2" Ball - 8,600 lbs. Brake Actuator reviews from real customers.
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  • Reviews (7)
  • Q & A (15)
  • Photos
  • Why etrailer?

Demco Brake Actuator - 8608611

  • Surge Brake Actuator
  • Disc Brakes
  • 2 Inch Ball Coupler
  • 8600 lbs GTW
  • Demco
  • Bolt-On
  • Electric Lockout
  • Straight Tongue Coupler

Surge-type actuator features easy-to-use eZ-Latch coupler mechanism, a corrosion-resistant composite master cylinder, and durable zinc plating. Electric reverse lockout activates automatically to keep trailer brakes from actuating when in reverse.


  • Hydraulic actuator activates trailer's brakes when tow vehicle slows or stops
  • Electric reverse lockout lets you back up without actuating trailer brakes
    • Solenoid activates automatically when you shift into reverse
  • eZ-Latch coupler mechanism ensures 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
  • Zinc plating offers corrosion resistance
    • 200-Hour salt spray rating
  • 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
  • Large rear rollers allow for easy movement and smooth operation
  • Spring-loaded pushrod assembly ensures controlled brake line pressure
    • Rubber boot on pushrod guards against dirt and moisture
  • Breakaway included
    • Snap hook on safety cable ensures secure connection to breakaway lever
  • Heavy-duty steel construction with sturdy, reinforced outer casing
  • 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: 8,600 lbs
  • Maximum tongue weight: 860 lbs
  • Mounting: 3" wide channel tongue
  • Model number: DA86B
  • 1-Year warranty

Demco Actuator Dimensions

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.

Electric Reverse Lockout

The electric reverse lockout on this trailer brake actuator is automatically activated when you shift your tow vehicle into reverse. The solenoid wires into your trailer connector - which connects to your tow vehicle - so that it can detect when you are in reverse. When your vehicle is in reverse, the solenoid ensures that the hydraulic actuator does not activate your trailer's brakes, thus allowing you to back up your rig. To use the lockout feature, you must have a 5-pole flat, 6-way round, or 7-pole trailer connector.

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.

8608611 Demco DA86B Hydraulic Trailer Brake Actuator for Disc Brakes with Easy Latch and Electric Lock-Out - 2" Ball Coupler - 3" Channel - 8,600 lbs

Customer Reviews

Demco Hydraulic Brake Actuator w/ Electric Lockout - Disc - Zinc Plated - 2" Ball - 8,600 lbs - 8608611

Average Customer Rating:  4.0 out of 5 stars   (7 Customer Reviews)

Surge-type actuator features easy-to-use eZ-Latch coupler mechanism, a corrosion-resistant composite master cylinder, and durable zinc plating. Electric reverse lockout activates automatically to keep trailer brakes from actuating when in reverse.

- 8608611

The bolt holes in the coupler didn't line up with my frame where I removed old part so had to cut. And the new coupler only has two bolt holes while the old one had three. I thought it would have been standardized. 141283

- 8608611

Easy installation and excellent customer service!! This thing is amazing and fast to hook up to my truck. It just drops right on with no problem and auto latches very easily every time. 921259

- 8608611

It would have been nice to include a set of installation instructions on the surge hitch 855004

- 8608611

When driving in hills or mountains the surge brakes slide forward and have caused me to burn up brakes and heat them to the point grease melts. You have lock out brakes in hilly conditions to avoid this. So you are driving with no brakes when you need them most. I will need to replace the unit in now at more cost. Unsafe and waste of money. Would not recommend buying these brakes. 817169

- 8608611

It fit directly over where the old one was and all of the holes lined up perfectly. Wiring the reverse lock out was easy. I spent about 30 minutes on the installation. I would recommend this unit and would order it again. 664992

The product is still performing flawlessly after a year.
Wade R - 07/01/2020


- 8608611

I received this Demco surge-brake hydraulic hitch within 3 days. It came very well packaged and in perfect condition. I installed it fully in 10 minutes, another 20 minutes to bleed my brakes. I put it to immediate use hauling my tandem axle trailer for my 23’ boat. Worked perfectly. I love the “quick coupler” feature, which is the way the hitch clicks onto the ball. It makes one-man trailer connection a breeze. I am very pleased with the Demco hitch, as it is heavy duty and very well constructed and finished, and I am very pleased all around with etrailer.com. Thank you. 500332

- 8608611

Great quality and price. 117858


Ask the Experts about this Demco Brake Actuator

  • Mounting Hole Spacing of Demco DA86B Hydraulic Brake Actuator
    In regards to the Demco Hydraulic Brake Actuator part # 8608611, the mounting holes are spaced 1.50" apart left to right and 1.13" top to bottom. I have attached a diagram for you below as well.
    view full answer...
  • How To Bleed Demco Hydraulic Brake Actuator 8608611
    I have attached for you below the bleeding procedure for a Demco DB86 Brake Actuator like part # 8608611. In order to push fluid through the master cylinder you'll need to follow these procedures. If you still have issues after completing these please just let me know.
    view full answer...
  • Where to Connect 2 Yellow Wires for 8,600 lb Demco Hydraulic Brake Actuator w/ Electric Lockout
    The 2 wires for the electric lockout on the Demco Hydraulic Brake Actuator # 8608611 are just power and ground. One needs to be grounded to the trailer frame while the other needs to be connected to the reverse light circuit on your tow vehicle. It doesn't matter which yellow wire is connected to which function.
    view full answer...
  • Can Disc Brake Actuator be Used with Trailer Drum Brakes
    For a disc brake actuator like the Demco # 8608611 to work with drum brakes you need to replace the master cylinder otherwise the pressure will blowout the wheel cylinders on your drum brake assemblies. If you were to have this specific actuator then you can use the Demco Actuator Replacement Master Cylinder for Drum Brakes # 5650 to make it compatible with drum brakes. If you have a different actuator let me know what it is. If we carry that brand then we likely have the master cylinder...
    view full answer...
  • Replacement Actuator Solution for Trailer with Atwood 85778
    Since Atwood is no longer around (they were bought out) exact replacements for their actuators aren't available but we do have similar actuators that will work well as a replacement like the Demco # 8608611 which is a 8,600 lb rated disc brake surge actuator. It also comes with a reverse lock out solenoid and fits 2 inch hitch balls.
    view full answer...
  • Replacement Actuator for UFP A60 on Karavan Tandem Axle Boat Trailer
    From what I was able to determine with some research, your boat's dry weight is around 4100-lbs and the trailer weighs around 1000-lbs, so when you add fuel and other cargo you're probably in the 5500-lbs range (the GVWR of a Karavan tandem axle trailer is around 5700-lbs). At the end of the day, you really don't need the Demco D86B # 8608611 on this trailer and you'd likely experience some reduced braking conditions because of the size difference in the trailer and actuator. Since...
    view full answer...
  • What Type of Brake Fluid Does the Demco Hydraulic Brake Actuator 8608611 Use
    The Demco Hydraulic Brake Actuator part # 8608611 will use standard DOT 3, 4 or 5.1 brake fluid which can be obtained at pretty much any local auto parts store.
    view full answer...
  • Setup Procedure for Demco 8608611 Hydraulic Trailer Brake Coupler
    Once the installation is complete, with the mounting bolts properly torqued, the brake line is attached and the master cylinder is filled, you'll want to bleed the brakes according to the procedure outlined on page 10 of the installation instructions. Once that's complete, your trailer brakes will be good to go. I've linked you to a product description video for the # 8608611 coupler.
    view full answer...
  • Is a Brake Controller Needed for Trailer with Hydraulic Actuator and Brakes
    An electric brake controller is not required for use and would not serve any purpose with regards to the function of a hydraulic actuator like the Demco # 8608611 you were looking at. Hydraulic actuators send power back to the trailer brakes by using the trailer's natural momentum when starting/stopping. When you step on the brakes in your vehicle and start to slow down the trailer will push against the actuator's master cylinder to send pressure back to the brakes. Nothing is needed inside...
    view full answer...
  • Does Electric Lockout on Demco Hydraulic Brake Actuator Have to be Connected to Backup Lights
    If you only have an aftermarket backup camera tied into your OEM wiring then I'd be surprised if the electric lockout on the Demco Hydraulic Brake Actuator # 8608611 blew any fuses. I suppose you could technically wires it to any 12V power source as long as you made sure it sent power back when you are backing up, but then you run the risk of damaging trailer and tow vehicle components so I don't really recommend doing that. It would be best to connect it directly to the reverse light circuit. If...
    view full answer...
  • Does Mounting Demco DA86B Coupler Require Using all Bolt Holes
    Yes I would recommend you use all three bolt holes of the Demco Coupler DA86B # 8608611 when installing it. Or you can have it welded to the trailer instead.
    view full answer...
  • Can Drum Brake Actuator Be Used Temporarily on Trailer with Disc Brakes
    The problem with using a drum brake actuator with disc brakes is that it's not going to supply enough pressure to fully engage the assemblies. Drum brake actuators typically put out around 1,000 to 1,200 psi (sufficient for drum brake assemblies) but disc brake systems require around 1,600 psi, thus an actuator specifically designed for them. Because of this your braking power is going to be greatly reduced with your current setup. With a tandem axle trailer this could cause some issues,...
    view full answer...
  • Replacement Brake Actuating Coupler for Atwood 85778
    The Atwood 85778 actuator has been discontinued so I recommend the Demco Hydraulic Brake Actuator w/ Electric Lockout - Disc - Zinc Plated - 2" Ball - 8,600 lbs # 8608611. If you need a higher capacity, then you will need to use a 2-5/16 inch hitch ball. I've linked the page to other options if needed.
    view full answer...
  • How to Determine if Kodiak Disc Brake Kit K2R35DKG Will Fit a Trailer
    As long as your axle has 5 on 4-1/2 inch bolt pattern idler hubs plus a brake mounting flange the Kodiak Disc Brake kit part # K2R35DKG will fit it. Look for a plate behind the spindle with 4 bolt holes in it for the flange. As long as the hubs of your trailer take L44649/L68149 bearings the bearing kit part # BK2-100 will fit them. As long as the trailer has a 3 inch wide frame channel the Demco part # 8608611 will fit. The tandem brake line kit part # 24TA-BLKIT will work with the...
    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...

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Info for this part was:

Written by:
Dan D
Expert Research:
Mike L
Expert Research:
Jameson C
Updated by:
Lindsey S
Updated by:
Laura H
Updated by:
Kristina F

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