1. Brake Actuator
  2. Demco
  3. Surge Brake Actuator
  4. Drum Brakes
  5. 2 Inch Ball Coupler
  6. 6000 lbs GTW
Demco Hydraulic Trailer Brake Actuator - Drum Brakes - Zinc Plated - 2" Ball - 6,000 lbs

Demco Hydraulic Trailer Brake Actuator - Drum Brakes - Zinc Plated - 2" Ball - 6,000 lbs

Item # 8605001
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Brake Actuator
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Demco Surge Brake Actuator - 8605001
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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. Easy-to-use leverlock coupler fits 2" hitch balls. Call 800-298-8924 to order Demco brake actuator part number 8605001 or order online at etrailer.com. Free expert support on all Demco products. Guaranteed Lowest Price and Fastest Shipping for Demco Hydraulic Trailer Brake Actuator - Drum Brakes - Zinc Plated - 2" Ball - 6,000 lbs. Brake Actuator reviews from real customers.
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Demco Brake Actuator - 8605001

  • Surge Brake Actuator
  • Drum Brakes
  • 2 Inch Ball Coupler
  • 6000 lbs GTW
  • Bolt-On
  • Demco
  • 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. Easy-to-use leverlock coupler fits 2" hitch balls.


Features:

  • Hydraulic actuator activates trailer's brakes when tow vehicle slows or stops
  • Leverlock coupler mechanism ensures simple, secure hookup and disconnect
    • Trigger-style latch is easy to use
  • 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


Specs:

  • Application: trailers with hydraulic drum brakes
  • Ball size: 2"
  • Gross towing weight: 6,000 lbs
  • Maximum tongue weight: 600 lbs
  • Mounting: 3" wide channel tongue
    • Bolt holes are 3" apart on center
  • Model number: DA66B
  • 1-Year warranty


Actuator Dimensions

Note: 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.


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.


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.


Demco Model DA66B Hydraulic Actuator


8605001 Demco DA66B Hydraulic Trailer Brake Actuator for Drum Brakes - 2" Ball Coupler - 3" Channel - 6,000 lbs

Installation Details 8605001 Installation instructions




Customer Reviews

Demco Hydraulic Trailer Brake Actuator - Drum Brakes - Zinc Plated - 2" Ball - 6,000 lbs - 8605001

Average Customer Rating:  4.8 out of 5 stars   (329 Customer Reviews)

Surge-type actuator features a corrosion-resistant composite master cylinder and durable zinc plating with a 200-hour salt spray rating. Easy-to-use leverlock coupler fits 2" hitch balls.

- 8605001
by:

There is slop where coupler goes into the actuator box. When towing my 20' boat I can feel it bouncing up and down a bit after each bump. I'm considering changing out to different brand as I concerned it will round out the bolt holes and make the slop even worse. 465677


Comments
James,Thank you for your review. I have contacted demco and there will always be some movement of the coupler body in the outer case. Typically the movement measures 14 approximately. There should not be any more slack than that.
-- Heather A - 01/12/2018

32904

- 8605001
by:

Exactly what I was looking for, perfect fit, great pricing! 665216


Comments
Still working great
Travis G - 07/02/2020

84781

- 8605001
by:

Deliver the Demco Hydraulic Trailer Brake Actuator - Drum Brakes - Zinc Plated - 2" Ball - 6,000 lbs - 8605001 to my mechanic, who is doing a complete overall to my trailer brake system. The product looks very good and was delivered as promised. Thanks, Russ 565180


Comments
The Demco H.T.B. works great and has made my trailing experiences a much improved success. I recommend this product,
Russ - 09/14/2019

61126

- 8605001
by:

Best price on the internet for the whole assembly. I was going to rebuild my old one, but when I saw the price for a new replacement, I went with that. The quality is very good. No instructions came with it, but I found a video on the Etrailer site that showed me how to install the actuator and bleed the brake lines. Be sure to check the brass exit-fitting on the unit for tightness. Mine was very loose. The video does mention to do that. I'd suggest that Etrailer provide more packing when shipping these. Luckily there was no damage but the packing material was sparse. 177655



- 8605001
by:

Highly recommend company! I am pleased with the direct fit of my new hitch. I took the measurements of the trailer tongue 3", bolt holes center to center 3". The hitch is rated for 6k and my pontoon boat and trailer come in at 4.4k. Nice product, heavy duty and much better than factory. Shipping was extremely fast, easy to track with etrailer email notifications. The customer email service is superior to many other companies. 541261



- 8605001
by:

Product worked as designed, however; your companies staff person (Sal M) was extremely helpful with options and patients getting my order filled to my expectations and my timeframe. He represented what customer service is all about! Thank You Sal!! Robert Wallace 384207



- 8605001
by:

Fit perfectly in existing spot. Once hooked up and brakes were bled, worked phenomenally. Would definitely recommend this to anyone needing a new surge brake actuator 613373



- 8605001
by:

The new unit fit perfectly on my 1988 boat trailer. Installation couldn't have been easier - bolt holes lined up exactly. I watched an etrailer video demonstrating the install procedure, and by watching the video I realized that the anti-collapsing spacer tube which goes inside the trailer tongue tube was missing. I made two steel spacers and installed them inside the tongue when I installed the new brake actuator unit. I very happy I made this necessary upgrade. 501067


Comments
The unit fit exactly like the original that it replaced. Working better than the 30 year old one.
Aaron - 04/26/2019

54484

- 8605001
by:

This was easy to install and works great; I installed it myself on my boat trailer in order to get the brakes to work. The boat is quite heavy (6k lbs) very happy with this product and would recommend. 108884



- 8605001
by:

Demco surge brake actuator Demco brake cluster (2) Product shipped and was received within a couple of days. Finally warmed up enough to tackle this project. My tow-dolly is a 1998 so the job was a little different than the video shows. Had to wrench the bolts all the way out with a cheater ( think Loc-Tite ). Also needed a little help with a hammer to separate hub/spindle from backing plate. Went back together pretty well. New actuator went right into place. Great service. 351344



- 8605001
by:

Installed today. Fit was good with 4-1/2" grade 8 bolts and flange nuts. Had blown out and used my existing brake lines as I was replacing the brakes also. Gravity bleed wasn't working for me, so I rigged up light air pressure from the compressor with the bleeders open to push the brake fluid through the lines. Then with a few times pumping the ball part of the hitch back and forth to the actuator and holding it in with a clamp as to bleed it like an auto brake, the air was bled out and the job was done. 658638



- 8605001
by:

seems to work fine. had to extend my brake line about 3 inchs, not to big a deal. 134947


Comments
working fine
carl s - 06/12/2015

12489

- 8605001
by:

EVERYTHING WENT WELL PERFECT REPLACEMENT THE ONLY THINK WAS THE ACCOUNT IS IN MY NAME ART, BUT SOMEHOW IT CAME ADDRESSED TO MY SON'S NAME. 893128



- 8605001
by:

Very easy to install and bleed and it works great replaced a weld on one very easy 892415



- 8605001
by:

Product is perfect and the customer service was even better! 883157



- 8605001
by:

I started with new backing plates and brakes and new drums . Next I connected them with Kodiak rubber break lines and connected them to a Demco actuator. This completed the replacement of my non functioning break system . The entire process was fairly simple with the parts I was able to get from E trailer 881278



- 8605001
by:

Great price, and nice installation video. Vert pleased with this product. 875423



- 8605001
by:

Great replacement for my worn out original. Easy installation. I’ve had it on my dolly for a year now and still looks new even after being stored outside. 874615



- 8605001
by:

We will see how long it lasts as the reservoir is maxe of plastic. 874407


Comments
Yes, the master cylinder is made of glass reinforced nylon composite material. This part is specifically designed as reinforced nylon to last longer because of its corrosion resistant material.
-- Heather A - 09/25/2020

101407

- 8605001
by:

Works great! perfect replacement and fit. no issues 873129



- 8605001
by:

Fits and works exactly as described. Easy install. 872975



- 8605001
by:

They were very helpful with orders and I was happy with how fast it was delivered 871383



- 8605001
by:

looks good have not got it all hooked up yet 870006



- 8605001
by:

Works great. Brakes now work as design ed. 869659



- 8605001
by:

Great brake actuator. Working great, still pleased with operation. 868943


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Show More Reviews

Ask the Experts about this Demco Brake Actuator

  • Replacement for Atwood 82543 Surge Brake Actuator
    The closest option we have to replace your Atwood 82543 actuator is part # 8605001, which is the item you referenced. However, this actuator doesn't have the lockout like your Atwood does. For a lockout use # T4748800 as an electric lockout. It wires into the reverse lights on your vehicle via the circuit on your trailer connector.
    view full answer...
  • Surge Brake Actuator to Replace Atwood 82543
    The closest option we have to replace your Atwood 82543 actuator is part # 8605001. However, it doesn't have the lockout like your Atwood does. To add a lockout use # T4748800 but it's an electric lockout unlike the Atwood's manual lockout. It wires into the reverse light circuit on your truck through the trailer connector. I've attached videos of both actuators for you to take a look at.
    view full answer...
  • Replacement for Atwood 61101 Brake Actuator
    The Demco Hydraulic Trailer Brake Actuator part # 8605001 should be a direct replacement for the Atwood 61101 Brake Actuator that you have now. This is a bolt on option that mounts on 3" centers. The review you are referring to, the customer did indeed weld the brake actuator to his tongue but this is not required for installation because it is a bolt-on actuator. Unfortunately, we do no offer a bolt-on brake actuator for drum brakes with a manual lockout that will work for you therefore...
    view full answer...
  • Recommended Replacement Brake Actuating Surge Coupler for Atwood 85778
    Thanks for the photo. That is a great help for getting you the correct replacement. I recommend the Demco Hydraulic Trailer Brake Actuator - Drum Brakes - Zinc Plated - 2" Ball - 6,000 lbs # 8605001 for a nickel plated option. This coupler does not have the reverse lockout, so you will need to add it using the Replacement Solenoid Valve for Titan Brake Actuators with Reverse Lockouts # T4748800 and the shield # T4835800183. We don't have any Atwood replacement master cylinders...
    view full answer...
  • Recommended Replacement for Atwood Surge Brake Actuator 85778
    The manual lockout on your Atwood 85778 surge brake coupler is there so that you can back up the trailer without the brakes locking up on you. Yes you can safely tow your trailer with the broken manual lockout, you just have to make sure you don't put yourself in the situation where you have to back your trailer up. Since Atwood went out of business there aren't any exact replacements for your coupler but you can use a different brand. The only thing I was able to find online about the...
    view full answer...
  • Reverse Lockout To Use with Demco Surge Actuator for Drum Brakes # 8605001
    While we don't offer a version of the Demco Actuator part # 8605001 with a reverse lockout we do offer a lockout that will work great with it that you can order separately with it as part # DM5836.
    view full answer...
  • 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...
  • Replacement Actuator and Hydraulic Brake Lines for 1989 Escort Boat Trailer
    Yes. As long as you have a 3" wide channel tongue, you can use the Demco Hydraulic Trailer Actuator # 8605001 as a replacement for your current actuator. For new brake lines you'll want to use the Kodiak Hydraulic Brake Line Kit # 18SI-BLKIT which will allow you to replace the brake lines on a trailer up to 18 feet long. There is also a 15 foot kit available with part # 15SI-BLKIT. I don't recommend running them outside of the frame since they could be pinched off quite easily, so we do...
    view full answer...
  • Replacement Shock for Atwood Surge Trailer Coupler Model 85778
    I do have an option for you but Atwood has went out of business some years ago so there are no longer any replacement parts available for their trailer couplers. Therefore, the only option you have would be to replace the entire trailer coupler but we have a great option for this in the Demco Hydraulic Trailer Brake Actuator part # 8605001.
    view full answer...
  • Can Trailer Back Up With Demco Hydraulic Trailer Brake Actuator # 8605001 Installed
    The Demco Hydraulic Trailer Brake Actuator # 8605001 that you purchased doesn't have an electric or manual lockout integrated so to back your trailer with the actuator as-is would mean you need free-backing brakes on your trailer. You still have the option to add an electric solenoid though with part # DM5837. This installs by threading it into your master cylinder and then allows you to back your trailer up when you connect the wiring to the reverse light circuit on your tow vehicle/trailer....
    view full answer...
  • Can Electric Lockout be Added to Demco Hydraulic Actuator # 8605001
    I do have an option for you, however an electric lockout solenoid cannot be added to the Demco Hydraulic Trailer Brake Actuator # 8605001 referenced in your question. For an actuator like this that doesn't feature a lockout you will need the trailer to have free-backing brakes. Otherwise your best option is to go with an actuator that features an electric lockout already. For a similar unit to the Demco model you were looking at I recommend the Titan Zinc-Plated Brake Actuator # T43397007K...
    view full answer...
  • Hydraulic Drum Brake Actuator and Brakes for Dexter 8-201 Hub and Drum on Boat Trailer
    I have added a link to a help article on everything you need to replace (or add) hydraulic drum brakes, but let's start with the actuator. What you need to know is the weight capacity you need, the hitch ball size you are coupling to, and the size of your channel to mount the coupler (though there are also couplers for A-frames, though it doesn't sound like that's what you have). For example, the Demco Hydraulic Trailer Brake Actuator - Drum Brakes # 8605001 has a 6,000 lb capacity,...
    view full answer...
  • Solution for Needing Replacement Atwood Master Cylinder
    We cannot get the Atwood replacement parts as they went out of business several years ago. Only solution for you would be an all new coupler like the Demco part # 8605001 that you referenced for if you have drum brakes or part # DM8605101 if you have disc brakes.
    view full answer...
  • Demco Surge Brake Coupler with Electric Lockout to Replace Atwood 61101
    The Demco Hydraulic Brake Actuator - Drum - Zinc - 2" Ball - 8,600 lbs # DM8608601 will be a great replacement for you. There isn't an issue with the connection or the lockout solenoid using this as a replacement. The new solenoid wires will connect one to your reverse light function and the other to ground on your trailer tongue. It doesn't matter which one goes to ground and which one goes to power it will complete the connection needed either way.
    view full answer...
  • Would Demco Brake Actuator Be Proper Replacement for Tie Down Engineering Model 660
    The Tie Down Engineering (TDE) 6600 was compatible with 3 inch channel tongues, as is the Demco # 8605001. Functionally speaking, they'll both work exactly the same, and the bolt holes on both actuators are 3 inches apart on center so you'll be able to utilize the existing holes. The Demco calls for (2) 1/2 inch x 4-1/2 inch grade 5 bolts. Really the only difference of consequence between the two is that the TDE model has a 6600 lb capacity, while the Demco has a 6000 lb capacity. So,...
    view full answer...
  • Solution for Needing Replacement Atwood Master Cylinder for Surge Actuator
    There isn't a master cylinder replacement we can offer that will fit an Atwood surge coupler since Atwood had a unique design and unfortunately isn't around any more. Best solution is a new actuator like the part # 8605001 for drum brakes or part # DM8605101 for disc.
    view full answer...
  • Replacement Trailer Coupler Solution for Atwood 61101 on Trailer
    The Atwood coupler you have has been discontinued for quite some time now which means there are no replacement parts available for it. Now would be the time to replace the coupler with something like the Titan part # T4339720 which we have found works really well and is very reliable. This is a drum brake actuator which based on the number you mentioned is the type you are in need of.
    view full answer...
  • Surge Brake Actuator Replacement Recommendation for Atwood Model 84132
    Since Atwood went out of business none of their actuator (or other product) replacement parts are available unfortunately, so your only real option to having a working actuator is to replace the entire unit. I am attaching a link to our selection of replacement surge brake actuators that you can check out. If you can give me some more details about your Atwood actuator and send a few pictures in I can try to help you choose the best replacement option.
    view full answer...
  • Free-Backing Trailer Brakes and Actuator Recommendation
    The pros and cons of electric lockout vs free backing brakes mostly comes down to the ease of installation in not having to wire up your actuator to brakes; I also prefer a system where it is easier to troubleshoot issues and has less "moving parts". For those reasons I recommend going with the free-backing brake system as opposed to going with an electric lockout actuator. For a new actuator I recommend the Demco Hydraulic # 8605001 . This is a great replacement for the Atwood 61101 and...
    view full answer...
  • Recommended Disc Brake Upgrade for Boat Trailer
    To give you your upgraded brake system, I recommend using the Kodiak Disc Brake Kit - 10" Rotor - 5 on 4-1/2 - Dacromet and KodaGuard - 3,500 lbs # K2R35DKG which will install right over your current hubs. I also recommend using the Kodiak Hydraulic Brake Line Kit - Single Axle - 18' # 18SI-BLKIT which will give you flexibility for your brake calipers and folding coupler connection. Then you can use the Titan Zinc-Plated Brake Actuator w/ Electric Lockout - Disc - Multi-Fit Ball - Bolt...
    view full answer...
  • Flexible Brake Line to Attach to Master Cylinder on Demco Hydraulic Trailer Brake Actuator 8605001
    Unless you have a folding tongue you don't have to have a flexible brake line at the back of the master cylinder unless you want one. You can use # DM05982 which has 1/8" e-coated steel male and female fittings on either end.
    view full answer...
  • Can Reverse Lock Out Solenoid be Added to Demco Actuator 8605001
    Actually you can add an electric lockout to the Demco actuator part # 8605001 pretty easily with the part # DM5836 and you'd be set!
    view full answer...
  • Correct Demco Hydraulic Trailer Brake Actuator For Use with Disc Brakes
    For starters, the Demco Hydraulic Trailer Brake Actuator part # 8605001 is for drum brakes only and it sounds like you have disc brakes. Therefore, the correct Demco Hydraulic Trailer Brake Actuator for use with disc brakes is part # DM8605101 which does come with a reverse lockout feature. In order to use this you will also need a new trailer connector, the Hopkins Wiring Harness part # HM37918 and an adapter, the Adapter 4-Pole to 5-Pole Trailer Wiring Adapter part # 47515. The Demco...
    view full answer...
  • What Size Fitting Is On the Demco Hydraulic Trailer Brake Actuator DA66B
    The Demco Hydraulic Trailer Brake Actuator part # 8605001 will take a male 3/8"-24 fitting such as the Demco Hydraulic Brake Hose with Fittings part # DM05982. I am not sure what size fittings you have now but all you would need is an adapter to go from the above 3/8"-24 fitting to the size you have now and this can be obtained locally.
    view full answer...
  • Is Braking Affected By Switching From 6,000 lb to 8,000 lb Hydraulic Drum Brake Actuator
    Going from an actuator such as the Demco Hydraulic Trailer Brake Actuator - Drum Brakes - Zinc Plated - 2" Ball - 6,000 lbs # 8605001 to a larger one, the Titan Zinc-Plated Brake Actuator - Drum - 2-5/16" Ball - Bolt On - 8,000 lbs # T4079200 will slightly affect the braking. It will be a smidgen more rigid due to the added strength of the larger capacity actuator, but this is something that will be very minimal and won't affect the way your trailer rides. I have added a link to a video...
    view full answer...
  • Recommended Replacement for ATwood 84312 Drum Brake Actuating Coupler
    The Atwood 84132 was designed for use with drum brakes, so for a qualified replacement, you'll want something compatible with a 3 inch trailer tongue with a 6K capacity, accepts a 2 inch ball and provides an electric lockout. Demco doesn't offer an 'off the shelf' exact replacement with a electric reverse solenoid because most folks just use free-backing brakes, in which case the # 8605001 you mentioned would work just fine. If you do NOT have free backing brakes, you can indeed use...
    view full answer...
  • Mounting Bolt Hole Dimensions for Demco Hydraulic Trailer Brake Actuator # 8605001
    The mounting bolt holes on the Demco Hydraulic Trailer Brake Actuator # 8605001 that you referenced are spaced apart exactly 3 inches, on center. From the center of the rear bolt hole to the end of the unit there is a distance of just under an inch (15/16 inch to be exact). The holes are 1/2 inch in diameter. I have attached an image with these dimensions labeled along with a couple additional dimensional diagrams for this actuator that you can check out. Just let me know if you need...
    view full answer...

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