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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
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Demco Hydraulic Drum Brake Assembly - Free Backing - Galvanized - 10" - Left Hand - 3,500 lbs 10 x 2-1/4 Inch Drum 40716
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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. Call 800-298-8924 to order Demco accessories and parts part number 40716 or order online at etrailer.com. Free expert support on all Demco products. Guaranteed Lowest Price 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.
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  • Reviews (151)
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Demco Accessories and Parts - 40716

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

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


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






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   (151 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.

- 40716
by:

Excellent quality. Installed easy with all 4 brakes assembly. Confidentiality!!!! 825153



- 40716
by:

Delivery was sooner than expected. Packaged properly. Brake assembly was clean and quality parts. Installation was a breeze. Compliments to a well run business 746288



- 40716
by:

Great fit, just what I needed. Easy to install and good price for galvanized. 455992



- 40716
by:

Perfect replacement for my old rusted boat trailer brakes. Assembly was straight forward. Brakes release well in reverse. All I could ask for. 412439



- 40716
by:

All parts are doing well. There have been no issues with anything. 408758



- 40716
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. 392687



- 40716
by:

Exactly what I ordered, will definitely use you again. Thanks 382898



- 40716
by:

Was easy to install and pricing was gre at. 377550



- 40716
by:

Great product !! 364378



- 40716
by:

having problems with the brakes locking up 360725



- 40716
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. 357157



- 40716
by:

these replacments for my boat trailer were and are very good and have held up to my standards for me , nice and easy replacment ! 326421



- 40716
by:

excellent product at a affordable price. will have my tow dolly back like new again. 318921



- 40716
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. 312587



- 40716
by:

Product is great, just as described and appears to be very god quality. A few hours later and my boat trailer was like new. Thanks Etrailer and Tommy C!!! 307088



- 40716
by:

Great products, great prices and great service. what more can I say? 297005



- 40716
by:

Great product, quick delivery and easy install! Will definitely order from Etrailer again. 295297



- 40716
by:

The product is as advertised. Once the hub is off it is only 4 bolts per side and hooking up the brake lines. Could not be easier. Great service and shipping! 294485



- 40716
by:

excellent trailer brakes 289017



- 40716
by:

Great product perfect fitment. Great shipping turnaround. 277418



- 40716
by:

Great product Works as intended 276784



- 40716
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 274809



- 40716
by:

Had them for about a year. Work great. No rust, they stand up to the salt water. Plenty of braking power, but not too much where the trailer feels like it's pulling you back. 266775



- 40716
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. 266376



- 40716
by:

The parts fit perfectly and were delivered in a timely manner, as always. 264074


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Ask the Experts about this Demco Accessories and Parts

  • How to Pick Out Replacement Brake Assemblies
    Thanks for submitting the pictures of your current brake assemblies. We don't have replacement parts for them, but you should be able to replace them. 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...
    view full answer...
  • 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.
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  • 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...
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  • What are the Correct Replacement Wheel Cylinders for Demco Hydraulic Trailer Brakes # 40716
    If you have Redline brakes (part # 40716 is actually Demco), then you will need to use Redline Wheel Cylinder, # BP17-030 (left) and # BP17-020 (right). The correct replacement wheel cylinder for your hydraulic trailer brake assemblies is determined by the brand and size of brake assembly that is on your trailer.
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  • 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...
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  • How to Pick Out Surge Brake Hub/Drums and Assemblies for Trailer
    So the easiest way to replace the components you mentioned would be with new hub/drums and new brake assemblies. To do that I'd need to know a few key pieces of info. The bolt pattern on the hub where the wheels attach, the bearing numbers out of the hub or the dimensions where they ride on the spindle. With that info I can get you the correct hub drum and from there know which brake assemblies you'll need. I attached a link to this page that details this process as well.
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  • Trailer Brake Recommendation for LoadRite Boat Trailer with 10 x 2-1/4 Inch Wheels
    There are many possible reasons why your brake could have failed. It is hard to specify why yours may have failed. I recommend checking the reverse lock-out on your actuator to make sure it is working properly. Backing up with your trailer connected if your reverse lock-out isn't functioning could be why your brakes failed. If the lock-out isn't working, you could use the Demco Hydraulic Drum Brake Assembly - Free Backing # 40716, # 40715. These brakes would allow you to back up with...
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  • 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...
  • 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.
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  • 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...
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  • Correct Mounting Bolts and Hardware for Galvanized 10 Inch Marine Trailer Brake Assembly 40716
    The 10 inch brake assembly, # 40716, does not come with mounting bolts. You would need bolts like # 7-75 to mount the assembly to the brake mounting flange. For matching washers, use # 5-8 and for nuts # 6-17.
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  • 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...
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  • 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...
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  • 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...
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  • 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...
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  • 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...
  • 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...
    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...
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  • New Brake Shoes or New Brake Assemblies for a 2007 Keystone Raptor Tow Hauler 3954SS
    For the price of brake shoes compared to just buying new assemblies it makes sense to just order new assemblies since the price is very similar and you end up getting all new components and don't have to mess with trying to install the new shoes. 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...
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  • 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...
    view full answer...
  • 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...
    view full answer...
  • How to Pick Out Replacement 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...
    view full answer...
  • Trailer Brake Assembly Replacement Recommendation after Water Contamination
    We sell several wheel cylinders that you could use as replacements. Most likely that is all you would need to replace on your assemblies. You will want to check out the link I attached to see all of the ones we carry so that you can pick out the correct one. Or, it would be a good time to replace your current brake assemblies. 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...
    view full answer...
  • 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...
    view full answer...
  • Difference Between Demco 10 inch Drum Hydraulic Brakes and etrailer.com Brand Brakes
    The big differences is basically pricing and brands. The part # AKFBBRK-35-D is a pair of Dacromet coated drum, hydraulic brakes that are free-backing. The part # 40716-15 is essentially the same thing buy made by Demco. The etrailer brand is going to cost less since it's our brand and there's not as much markup so it's the better deal. Now the part # 40716-15 is basically just the part # 40716 and # 40715. What doesn't make much sense though is the pricing difference. It would seem...
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  • How to Select New Brakes and Hubs for a Load Rite Boat Trailer
    The 2,600 lb axles on your Load Rite boat trailer are likely de-rated 3,500 lb axles, so you should have no problem using 3,500 lb brakes and drums. The important factor to consider in this situation is that the brakes match the brake mounting flange on your axle and that the hubs/drums match your spindles. Almost all 3,500 lb brake assemblies require a 4-bolt brake mounting flange. The bolt holes on the brake mounting flange should be 2-7/8 inches apart on center. If your brake mounting...
    view full answer...
  • Replacement Hydraulic Drum Brakes and Hubs for E-Z Loaded Boat Trailer
    Demco free-backing 10 x 2-1/4-inch galvanized hydraulic brakes # 40715 and # 40716 are intended for a 3500-lb axle with a 4-on-4 brake flange mounting pattern. These are a great choice for replacements for your trailer's one axle. These brakes work with 13- to 15-inch wheels. As long as you've matched your axle rating, drum size and mounting pattern these brakes should be perfect for your boat trailer. E-Z Loader trailers are pretty popular and they use readily available parts. If you...
    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...
  • Can Free-Backing Hydraulic Brakes Be Installed as Replacements on Boat Trailer
    You absolutely can install free-backing hydraulic drum brakes on your trailer. These will make reversing your trailer for loading and unloading a much easier process. You will want to make certain that you match not only the brake size but also the axle weight rating and mounting pattern. We offer free-backing brakes from Demco for 3500-lb axles, parts # 40716 and # 40715, as well as the Titan units you referenced, parts # T4071600 and # T4071500.
    view full answer...
  • Can Free-Backing Brakes Replace Non-Free-Backing Breaks on 2001 EZ Loader Boat Trailer
    You can use free-backing brake assemblies on your trailer in place of the existing non-free-backing brakes. For your 2001 EZ Loader boat trailer I recommend the Demco Hydraulic Drum Brake Assemly, Free Backing, Galvanized, for 10 Inch Brakes # 40715 for the right- hand side and # 40716 for the left-hand side. The galvanized steel will resist rust, making these assemblies great for your boat trailer. I have attached an installation video of these brakes for you. Another great option is...
    view full answer...




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Info for this part was:

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

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