bing tracking image
  1. Accessories and Parts
  2. Demco
  3. Trailer Brakes
  4. Hydraulic Drum Brakes
  5. Brake Assembly
  6. 10 x 2-1/4 Inch Drum
Demco Hydraulic Drum Brake Assembly - Free Backing - Galvanized - 10" - Left Hand - 3,500 lbs

Demco Hydraulic Drum Brake Assembly - Free Backing - Galvanized - 10" - Left Hand - 3,500 lbs

Item # 40716
Retail:$122.76
Our Price: $87.82
You Save: 28%
Accessories and Parts
Shipping Weight: 10 lbs
Add to cart
In Stock
40716 - Hydraulic Drum Brakes Demco Accessories and Parts
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

Customer Photos

Need help with installation?
Locate installers near me
Free-backing, driver's-side trailer brake assembly won't engage when you reverse, even if your hydraulic actuator is activated. Galvanized steel resists rust, making the assembly great for boat trailers. Mounting flange has 4-bolt pattern. 1-800-940-8924 to order Demco accessories and parts part number 40716 or order online at etrailer.com. Free expert support on all Demco products. Great prices and Fastest Shipping for Demco Hydraulic Drum Brake Assembly - Free Backing - Galvanized - 10" - Left Hand - 3,500 lbs. Accessories and Parts reviews from real customers.
  • All Info
  • Reviews (167)
  • Q & A (0)
  • Photos

Demco Accessories and Parts - 40716

  • Trailer Brakes
  • Hydraulic Drum Brakes
  • Brake Assembly
  • 10 x 2-1/4 Inch Drum
  • Demco
  • LH
  • 3500 lbs
  • Free Backing

Free-backing, driver's-side trailer brake assembly won't engage when you reverse, even if your hydraulic actuator is activated. Galvanized steel resists rust, making the assembly great for boat trailers. Mounting flange has 4-bolt pattern.


Features:

  • Marine-grade hydraulic drum brake assembly is great for boat trailers
    • Designed for use with surge-type trailer brake actuators
  • Sturdy, corrosion-resistant steel construction
    • Galvanized backing plate
    • Stainless steel spring hardware
    • Zinc-plated wheel cylinder
  • Free-backing design lets you back up without engaging the trailer brake, even if the actuator is activated
    • Riveted, fall-away brake shoe only anchors on drum when brakes are engaged as trailer is moving forward
    • Periodic manual adjustment required
  • Mounting bolts sold separately
  • Made in the USA


Specs:

  • Configuration: left hand (driver's side)
  • Dimensions: 10" diameter x 2-1/4" thick
  • Mounting flange bolt pattern: 4 on 4"
    • Measurement between center of mounting hole to center of mounting hole: 2-3/4"
    • Diagonal measurement bewteen mounting holes: 4"
  • Wheel size: 13" - 15"
  • Axle rating: up to 3,500 lbs
  • 1-Year warranty


Note: Because free-backing brakes are designed to eliminate nearly all friction between the brake shoes and the drum when you are driving in reverse, a trailer breakaway kit will not be effective should your trailer disconnect from your tow vehicle while you are backing up.


Free-backing brakes let your trailer move in reverse without the brakes being activated by your surge actuator. These brakes are needed if your actuator does not have a reverse lockout, which is a mechanism that ensures that the actuator does not activate when your rig moves in reverse.


Demco Free-Backing Brake with Fall-Away Shoe

This Demco free-backing brake assembly has a fall-away shoe that is designed to provide full braking action when your trailer is moving forward and to supply only limited friction when the trailer is moving in reverse. This is largely due to the incorporated dual springs at the shoe's pivot point. (One spring sits on either side of the shoe lever, so only a single spring is visible when looking at the brake assembly.)


Demco Free Backing Brake Labeled Diagram - Left Hand Assembly

When your rig is moving forward and you engage the trailer brakes, the fall-away shoe expands normally, with the leading edge of the shoe catching the drum. This occurs because the plunger on the hydraulic cylinder pushes on the shoe lever, forcing the leading edge of the brake shoe into the drum. Once that edge catches, the dual springs at the shoe's pivot point facilitate braking by forcing the rest of the shoe to pivot into the drum. The action of the shoe against the drum provides the friction required for braking.


When you are driving in reverse, however, the hydraulic cylinder and the springs work against one another. Even though the plunger pushes on the shoe lever, the dual springs of the fall-away shoe overcome the pressure from the brake cylinder, keeping the leading edge from catching on the drum and ensuring that the shoe does not fully pivot into the drum. Because the shoe makes only slight contact with the drum, just enough friction is generated so that only a minimal amount of braking occurs when you are in reverse.



SB40716M Demco Galvanized 10" Marine Trailer Brake Assembly - Freebacking - Left Hand




California residents: click here


Customer Satisfaction Score:


Customer Reviews

Demco Hydraulic Drum Brake Assembly - Free Backing - Galvanized - 10" - Left Hand - 3,500 lbs - 40716

Average Customer Rating:  4.8 out of 5 stars   (167 Customer Reviews)

Free-backing, driver's-side trailer brake assembly won't engage when you reverse, even if your hydraulic actuator is activated. Galvanized steel resists rust, making the assembly great for boat trailers. Mounting flange has 4-bolt pattern.

by:

Great company to deal with. Impressive and Professional. Very reasonable in pricing.
Products purchased; trailer Drum and hydraulic surge brakes. Fitted and Work's perfectly. Sad to see everything is made in China.



by:

received, installed, working good.

Bob F.

5/14/2015

After getting the adjustment loose enough the brakes have performed well. I am pleased with the brake system.



by:

Product arrived in a timely manner. The visual tracking in route was a plus and very informative. All parts were packed well and in perfect condition. Thanks etrailer for your service and installation videos. My boat is up and running and ready for the water.

Ron D.

7/5/2016

On going issues with the left driver side brake. Keeps locking up after a hard brake. Not sure how to correct this issue. I have installed surge brakes on other boat trailers and this is the first I cannot correct. Please help.



by:

This brake assembly bolted right up and installed in minutes. Much faster and easier (and more cost efficient) than replacing just the failed parts of the original brakes (frozen wheel cylinder and shoes). The "free backing" feature doesnt seem to work all that well. I can feel a heavy amount of drag in reverse and leave tire marks from my trailer all the way up my sloped driveway unless I manually engage the reverse lockout on my actuator. I purposely bought this set so I wouldnt have to do that anymore.



by:

Got these with the Demco hitch to replace an old attwood system. Replaced as old brakes were well packed with bearing grease, not a typo. Hardest part was getting off the old 4 nuts on the bolts holding on the old brake plates. Twenty years and at least three coats of paint made removal almost impossible, thank you aero-kroil,sp?? If I had used them, I'd let you know how those free-backing things fair.



by:

Hydraulic trailer drum brakes. Received within a few days. Easy to install, not that complicated. Needed a second person to help bleed the brakes.



by:

Ordered replacement brake assemblies for my aging boat trailer. Catalog and ordering info on the website was very helpful. Parts were in stock, order was filled in a very timely fashion and showed up on my doorstep as predicted by the shipping tracker info. Flawless experience. Thanks, etrailer!



by:

Assembly arrived quickly and in good shape. A relatively easy installation onto my boat trailer was supported by the useful instructional video. I will continue to use etrailer.com for my trailer parts.



by:

The hydraulic drum brakes with backer plates, I ordered came on time and fit great. I also installed new bearings and they fit good too. I will use them again when I need more parts.



by:

I ordered a new set of brakes for my boat trailer. They arrived in a timely manner right to my door step. The replacement parts were identical to the originals and were easily installed. The ordering process was easy and the door step delivery very convenient. Also, the parts were cheaper than what I would have paid locally.



by:

Perfect replacement for my old rusted boat trailer brakes. Assembly was straight forward. Brakes release well in reverse. All I could ask for.



by:

I needed brake shoes and wheel cylinders for my tandem axle trailer; etrailer is the only place that I could find what I was looking for. The Demco hydraulic drum brake assembly had everything I was looking for with steel wheel cylinders and riveted shoes.Great quality and fit. Fast shipping; knowledgeable customer service. Thanks, etrailer.



by:

The parts fit correctly to the axle. The bearings & races came out & installed without any malfunctions. It was even easier to adjust the brakes. The master cyl. bled out great & was easy to replace a long with the damper shock. The people I dealt with especially Erika all help tremendously. A terrific experience all along.



by:

These brake parts were easy to install after watching the videos at etrailer.com. I installed brakes on both wheels on my boat trailer along with new seals and they work great. I've only taken a test drive, but the new brakes really help.



by:

Product was good . I had a little problem with one of the backing plates not fitting correctly . After determining it was bent., I took everything off the new backing plate and put them on one of the old ones and reused it and everything worked fine



by:

brake assemblies arrived quickly , correct match for my boat trailer. Good price .I will recommend this company to my friends

Paul B.

1/14/2016

No problems. Satisfied customer



by:

Fit just fine. Glad to get rid of the rusty originals. Only oddity is that the bleeder screw appears to be metric (10) instead of 3/8" like the originals. They are also a bit loose in their bore so when you back bleed the system (ie pump brake fluid from the bleeder to the brake reservoir, a fare amount of fluid leaks out around the bleeder threads. Not a big deal. just a bit messy.



by:

This product was reasonably price so I purchased it instead of piece parting it. It made the job much simpler. The only thing we have to do at the one year mark is to check the adjustment I would recommend this product to anyone thinking of rebuilding their trailer brakes.



by:

First set that I have purchased. Good quality, well made. Everything lined up just fine. I was able to install a flush kit to these without any drilling.



by:

Not only is replacing the entire assembly easier than the shoes and wheel cylinder, it is cheaper. Saved lots of time. Thanks for great service.



by:

Product was as listed, delivery as promised, price competitive and free shipping. The brake sets seem to be working just fine on my boat trailer.



by:

Extremely fast delivery and very well made. Hard to install than video indicated but not due to the brake product. The old brakes where install with Blue Loctite and required heating with torch to get them off using an impact wrench. After getting the old brakes off, installation was a breeze! High recommend this product.



by:

Excellent experience. Quick shipment. Great price. Good product (trailer drum brake assembly)



by:

Great product for boat trailers, made renewing my brakes easy



by:

excellent trailer brakes


25
148
Show More Reviews

See what our Experts say about this Demco Accessories and Parts

  • How to Pick Out Replacement Brake Assembly to Replace One with Broken Mounting Studs
    It's time for a new brake assembly since you broke off all of the mounting studs of your old one. I can help you find the right assemblies, but I do not know exactly which ones you have on your trailer. To pick out the correct brake assemblies for your trailer you need to know a few things. You will want to measure the inner diameter of your hub/drums and the depth of the drums to determine what brake assembly dimensions you need. For example the part # 40716 is a 10 inch by 2-1/4 inch...
    view full answer...
  • Torque Specs for Installing Demco 10 Inch Trailer Brakes and for Trailer Wheel Lug Nuts
    The torque value of the bolts/nuts used to hold the brake assemblies to the trailer brake mounting flange is going to depend on the grade of the 7/16 inch bolts you are using. The minimum for ASTM A307A Grade A hardware with 20 threads per inch is 18 foot pounds. But an SAE J429 Grade 5 goes up to 55 foot pounds. Grade 5 hardware will have 3 lines on the bolt head point towards the middle. The A307A will sate A307A. If you aren't sure what you have send me a picture and I can determine...
    view full answer...
    Image 1 for
  • How to Pick Out Brake Assemblies for an Older Airstream Trailer
    I can help you find the right assemblies, but I do not know exactly which ones you have on your trailer. To pick out the correct brake assemblies for your trailer you need to know a few things. You will want to measure the inner diameter of your hub/drums and the depth of the drums to determine what brake assembly dimensions you need. For example the part # 40716 is a 10 inch by 2-1/4 inch thick brake assembly. You also want to determine what the bolt pattern is of your assembly mounting...
    view full answer...
    Image 1 for
  • How to Pick Out Parts to Add Brakes to Trailer's Second Axle
    We would need to determine what spindles you have on your trailer so that we can replace the idler hubs of it with hub drums which would allow the install of brake assemblies. In order to do that you can either get the inner and outer bearing numbers from a hub or use a dial or digital caliper to get exact measurements of the spindle. The measurements needed are the parts of the spindle where the bearings ride. If you get back to me with that information I will help you pick out the right...
    view full answer...
  • How to Pick Out a Replacement Hub Drum to Go With the Brake Assembly part # 40716
    The brake assembly part # 40716 does not include the brake drum. If also need a brake drum to go with this assembly you will first need to determine what hubs you currently have so that you can find the correct one that will fit your spindles. In order to pick out the correct hub assembly for a trailer you are going to need know a few key pieces of information. The first thing you will need to know is the bolt pattern of your hubs. This is so you get a hub that is compatible with your...
    view full answer...
    Image 1 for
  • How to Pick Out Brake Assemblies for a Trailer
    To pick out the correct brake assemblies for your trailer you need to know a few things. You will want to measure the inner diameter of your hub/drums and the depth of the drums to determine what brake assembly dimensions you need. For example the part # 40716 that you referenced is a 10 inch by 2-1/4 inch thick brake assembly. You also want to determine what the bolt pattern is of your assembly mounting flange. The standard size is 4 on 4 inch. You also want to determine the axle capacity...
    view full answer...
  • How to Pick Out Brake Assemblies for Trailer
    I can help you find the right assemblies, but I do not know exactly which ones you have on your trailer. To pick out the correct brake assemblies for your trailer you need to know a few things. You will want to measure the inner diameter of your hub/drums and the depth of the drums to determine what brake assembly dimensions you need. For example the part # 40716 is a 10 inch by 2-1/4 inch thick brake assembly. You also want to determine what the bolt pattern is of your assembly mounting...
    view full answer...
    Image 1 for
  • How to Determine if Trailer Has Reverse Lock Out When Picking Out Brake Assemblies
    Is there a solenoid screwed in to the back of the master cylinder on the trailer? Or is there a lever on the actuator that you move whenever you need to be able to back the trailer up? If so, then you have a reverse lock out. I attached a link to a page that has all of the hydraulic assemblies we carry. If you need free-backing plates there is a filter on the page that you can select that will take you to a page that has all of the free-backing assemblies we carry. You also will want...
    view full answer...
  • How to Pick Out Replacement Brake Assemblies for a 2005 Keystone Laredo 29RL
    I can help you find the right assemblies, but I do not know exactly which ones you have on your trailer. To pick out the correct brake assemblies for your trailer you need to know a few things. You will want to measure the inner diameter of your hub/drums and the depth of the drums to determine what brake assembly dimensions you need. For example the part # 40716 is a 10 inch by 2-1/4 inch thick brake assembly. You also want to determine what the bolt pattern is of your assembly mounting...
    view full answer...
    Image 1 for
  • Info Needed to Pick Out Brake Assemblies for Trailer
    I can help you find the right assemblies, but I do not know exactly which ones you have on your trailer. To pick out the correct brake assemblies for your trailer you need to know a few things. You will want to measure the inner diameter of your hub/drums and the depth of the drums to determine what brake assembly dimensions you need. For example the part # 40716 is a 10 inch by 2-1/4 inch thick brake assembly. You also want to determine what the bolt pattern is of your assembly mounting...
    view full answer...
    Image 1 for
  • Measurement for Mounting Flange Bolt Pattern on Demco Hydraulic Drum Brake Assembly # 40716
    I went out to our warehouse to grab the Demco Hydraulic Drum Brake Assembly, # 40716, and took a couple pictures to show you the location of the mounting holes. From the pictures you can see that the 4 inch measurement that is listed for the bolt pattern is measured diagonally. Hope this helps.
    view full answer...
    Image 1 for
  • Troubleshooting Car Hauler Brakes that Stopped Working
    I am glad we were able to help!! Before you replace the assemblies let's first determine if they are the problem. I would hate to have you replace everything and then find out the problem was just a bad ground or a dirty pin on the trailer wiring connector. First and easiest thing to check is for corrosion on the trailer connector. This is typically the problem and is an easy fix. Try hitting the pin with some sandpaper to clean it off and provide a clean contact point. Try and see if...
    view full answer...
  • How to Pick Out Brake Assemblies for a Jayco Trailer
    I can help you find the right assemblies, but I do not know exactly which ones you have on your trailer. To pick out the correct brake assemblies for your trailer you need to know a few things. You will want to measure the inner diameter of your hub/drums and the depth of the drums to determine what brake assembly dimensions you need. For example the part # 40716 is a 10 inch by 2-1/4 inch thick brake assembly. You also want to determine what the bolt pattern is of your assembly mounting...
    view full answer...
    Image 1 for
  • How to Pick Out Replacement Brake Assemblies for a Trailer
    I can help you find the right assemblies, but I do not know exactly which ones you have on your trailer. To pick out the correct brake assemblies for your trailer you need to know a few things. You will want to measure the inner diameter of your hub/drums and the depth of the drums to determine what brake assembly dimensions you need. For example the part # 40716 is a 10 inch by 2-1/4 inch thick brake assembly. You also want to determine what the bolt pattern is of your assembly mounting...
    view full answer...
    Image 1 for
  • Do the Extra Flange Holes of the Demco Hydraulic Drum Brake Assembly # 40716 Need to Be Plugged
    The extra holes you referenced that the Demco Hydraulic Drum Brake Assembly # 40716 has would not need to be plugged. You would just attach the assembly to your trailer using the mounting flange and it would be good to go. If for some reason you wanted to plug the holes there's no reason you couldn't. I attached a few review videos for this assembly for you to check out as well.
    view full answer...
    Image 1 for
  • Recommended Replacement Hydraulic Brakes with 10-Inch Diameter for a Boat Trailer?
    Knowing the inside diameter of the drum is the key piece of information we need; the brand of the assembly will not be a factor in determining what you will need to replace your hydraulic brakes. You mentioned your trailer's GVW, but it is the trailer's axle weight capacity which determines the size of the brake assembly you are going to need. For example, a drum with a 10-inch diameter like yours fits brake assemblies for a 3,500 lbs axle. For your boat trailer, I recommend the Demco...
    view full answer...
  • Is A Brake Flange With A Bolt Spacing Of 2-3/4" The Same As A Brake Flange With Spacing Of 2-7/8"
    Yes, the Demco Hydraulic Brake Kit - Free Backing - Galvanized part # 40716-15 will fit a 3,500 lb trailer axle with a brake mounting flange dimension of 2-7/8". The dimensions of the brake mounting flange from bolt hole to bolt hole is an industry standard, however some companies such as "Demco" refer to this measurement as a 2-3/4 instead of the more common 2-7/8". The actual dimension is really more like 2-13/16", but different brake manufacturers will round to either 2-3/4" or 2-7/8"....
    view full answer...
  • Complete Hydraulic Brake Assy. for 2006 EZ Loader Trailer with Oil Bath Hubs
    Yes, the Demco # 40716-15 Hydraulic Brake Kit will fit your needs for a 10" X 2.5" assembly. When measuring the drum use inside measuerments as shown in the attached photo. You will just want to confirm your flange bolt pattern is 4 on 4". Measurement between center of one mounting hole to center of the next mounting hole. I have attached another photo depicting this.
    view full answer...
    Image 1 for Image 2 for
  • Is Demco Hydraulic Brake Kit # 40716-15 Sold As Pair or Individually
    The Demco Hydraulic Brake Kit # 40716-15 that you referenced is sold as a set. This gives you both assemblies you'd need for a single axle. So since you have a single axle trailer you need to just order a quantity of 1.
    view full answer...
  • Mounting Drum Brakes to an EZ-Loader Trailer with 4-Bolt Brake Mounting Flange
    If you are wanting to install your brakes on your EZ-Loader trailer, you will need brake mounting flanges with a 4 bolt pattern that matches the bolt pattern of your brake assemblies. We do carry some brake mounting flanges, but we will need to know the diameter of your axle or spindle shaft to determine if we have a brake mounting flange that will fit your trailer. The brake mounting flanges will need to be welded on square, so we recommend having a qualified professional with trailer...
    view full answer...
    Image 1 for
  • Replacement 10-Inch Galvanized Drum Brakes for Boat Trailer with 14-Inch Wheels
    If you cannot find a sticker or plate on your boat trailer axle you can still get in the ballpark on its weight rating based on the brake dimensions. All of our 10 x 2-1/4-inch drum brakes, both electric and hydraulic, that work with 14-inch trailer wheels will be rated for axle capacities from 3500-lbs on the low side up to 4400-lbs on the high side. The vast majority of these brakes are for 3500-lb axles so odds are good that is your rating. All brakes are shown on the linked page. Do...
    view full answer...
  • Is Galvanized Coating Best for Salt Water Application for Boat Trailer Brakes
    The Galvanized Demco Hydraulic Brake Kit # 40716-15 is definitely the best coating that you can get for corrosion resistance. The other coatings are basically just different levels of powder coats while galvanized resists salt water much better. I do recommend rinsing your boat trailer off as well to help extend the life of the various components.
    view full answer...
  • Recommended Brakes For Boat Trailer With Surge Coupler And 3500-Lb Axle
    There are quite a few brake assemblies that will work with your EZloader trailer. It helps when you give the information you provided when choosing a system. I recommend using free-backing brakes like the Demco Brakes. For the left hand(driver side) you would need part # 40716 and for the right hand I recommend part # 40715. These do not engage when backing up so they are great for a boat trailer. These brakes do have a 4-bolt brake flange.
    view full answer...
  • Brake Assembly Replacement Recommendation for 1994 Eagle Boat Trailer
    The brake assemblies part # 40716-15 that you referenced are exactly what you need. The size matches, the capacity is adequate, and the bolt pattern matches as well! I attached a review video for this brake assembly set for you to check out as well.
    view full answer...

Do you have a question about this Accessories and Part?


Info for this part was:

Employee Lindsey S
Updated by:
Lindsey S
Employee Adele M
Updated by:
Adele M
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Jeff D
Installed by:
Jeff D

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.


Product Experts Available Now!
Call 1-800-940-8924