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" - Right Hand - 3,500 lbs
Demco

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

Part Number: 40715
In Stock
$73.71
Retail:$88.74
You Save: 17%
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

In Use/Installed

Customer Photos

Need help with installation?
Locate installers near me
Free-backing, passenger'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 40715 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" - Right Hand - 3,500 lbs. Accessories and Parts reviews from real customers.
  • All Info
  • Reviews (180)
  • Q & A (0)
  • Photos

Demco Accessories and Parts - 40715

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

Free-backing, passenger'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: right hand (passenger'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 - Right 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.



SB40715M Demco Galvanized 10" Marine Trailer Brake Assembly - Freebacking - Right Hand




California residents: click here


Customer Satisfaction Score:

Ratings & Reviews

4.8

158 reviews
Free-backing, passenger'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:



by:



by:



by:

Fast Shipping & Great Product



by:



by:



by:

Perfect Packaging and never expected to get it so fast! Excellent!



by:



by:

Fast shipment and item worked great!



by:

everything correct



by:

worked perfectly.



by:

NICE PACKAGE. WELL WORTH THE $



by:

Great product and price



by:

Arrived on time and in great condition. ..



by:

Great kit 4 bolts and done



by:

Everything fit and worked great.



by:

Product Excellent and bought a pair!



by:

exact fit,should of bought new drums while I had it apart



by:

Bolted right up and stops like new agai n!



by:

perfect fit because of the excellent description given on the website



by:

Order went smoothly, arrived in timely manner. Items were well packaged.



by:

Great product !!



by:

Quality Product, exactly like the original but better



by:

Great product
Works as intended



by:

Items arrived pretty quick , well packed and looked pretty good. Should work just fine.


25
158
Show More Reviews

See what our Experts say about this Demco Accessories and Parts

  • 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.
    view full answer...
    Image 1 for
  • 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...
  • Determining If Surge Brake Actuator Has Lockout or If Brakes are Free-Backing
    The only way to turn a surge brake actuator "off" is to engage a lockout on the actuator. Some actuators have manual lockouts, others have electric lockouts, and some have no way to lock out the actuator. Typically, free-backing brakes are used with actuators that have no lockout. As long as the trailer brakes engaging when your tow vehicle is stopping, the brakes are working correctly. I have attached photos showing a manual lockout and electric lockout to help you determine if your actuator...
    view full answer...
    Image 1 for Image 2 for
  • Are All 4 Bolt Trailer Brake Mounting Flanges the Same Bolt Pattern
    Yes, the 4 bolt mounting pattern that the Titan Galphorite Free-Backing Hydraulic Trailer Brake Assembly # T4423400 and the Demco Hydraulic Drum Brake Assembly # 40715 have is the same 4 on 4 inch bolt pattern. Basically all 4 bolt brake mounting flanges are the exact same 4 on 4 inch pattern.
    view full answer...
    Image 1 for
  • Can Surge Coupler/Actuators Be Converted from Drum to Disc Brake Operation
    Surge couplers for drum and disk brakes use different master cylinders that operate at different pressures, lower for drums and higher for discs. It is possible to swap out the master cylinder in a surge coupler to convert it from one type of operation to the other. Depending on the number of brake assemblies, trailer length, etc, larger brake lines are sometimes also called for with disc systems. It sounds like you have free-backing drum brakes like # 40715 on the trailer now, which allow...
    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...
  • 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 to...
    view full answer...
  • How to Select Replacement Hydraulic Drum Brake Assembly for Calkins Boat Trailer
    You can choose a correct replacement hydraulic drum brake by matching up a few characteristics to yours. You need to match up axle weight capacity (usually found on a sticker or plate on the axle), the drum diameter and width, and your brake mounting bolt pattern. You can click on the link provided to see our main page for hydraulic drum brakes. First, click on the axle rating, then your drum size. Most of our brake assemblies, such as Demco Hydraulic Free Backing 10 x 2-1/4-inch brake...
    view full answer...
  • Hydraulic Disc or Drum Trailer Brakes for 10 Inch Wheels
    We have several options for trailer brakes that will fit a 10 inch wheel. For a 10 inch wheel you will need a 8-1/2 inch hub and drum assembly such as # T1544500042 which has a 5 on 4-1/2 bolt pattern. Then for hydraulic drum brakes we have just one option, # T4442000 for the right side and # T4442100 for the left side. These are designed for 3,000 pound axles. For disc brakes we have the following options: For 2,000 pound axles we have # K2HR2D. For 3,500 pound axles we have # K2HR35D-8.
    view full answer...
  • 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...
    Image 1 for
  • Replacement Electric Trailer Brakes for Snowmobile Trailer
    To determine the correct replacement electric brakes you will need to know the weight capacity of your axle and then measure the inside diameter and width where the pads from the brakes touch. If your axles are 3500 lbs and you get 10 inches by 2-1/4 inches AND the brake mounting flange has a 4 bolt pattern then assembly # 23-469 for the right and # 23-468 for the left will fit. The best brake assemblies as far as resisting corrosion due to moisture are hydraulic brakes, which are used...
    view full answer...
  • Does Brake Assembly part # 40715 Come with Lock Nuts and Washers
    The brake assembly part # 40715 does not come with lock nuts and washers. For that we have the part # 6-17 for the nut and part # 5-8 for the lock washer.
    view full answer...
  • Can One Set of Hydraulic Drum Brakes Provide Enough Stopping Power for a Tandem Axle Boat Trailer
    If your boat trailer came equipped with hydraulic drum brakes on both axles, it is best to keep both sets in working order, but if this is the route you prefer you'll want to put the new brakes on the rear axle where most of the boat's weight will be concentrated. I linked our main page for hydraulic drum brakes. You can use the filters on the page to select your overall axle capacity (both of your current axles' capacities added together) to see if we have brakes of the appropriate rating,...
    view full answer...
  • Replacement Hydraulic Drum Brake Assembly Recommendation to Replace Rusty Assemblies
    For the price of replacement brake pads and shoes it's almost always a better solution to go ahead and just replace the entire brake assembly. And in your situation with the current condition of your assemblies I would strongly recommend you do that based on how much rust is there. In order to pick out assemblies you need to know the diameter of the assemblies and the width of the brake brake pads. I can tell by the pics you have the standard 4 bolt mounting flange. The most common brake...
    view full answer...
    Image 1 for Image 2 for
  • Free-Backing 12 x 2 Drum Brake Drags When Moving Forward on Karavan Boat Trailer
    Thank you for providing the photo of the left-hand brake assembly on your boat trailer. The bolt that attaches your actual brake shoe to the shoe lever arm should be tight, but we do not have an actual torque specification. It is intended that the bolt provide a pivot point for movement between those two parts. After examining your photo and comparing it to all of the free-backing 12 x 2 brake assemblies we offer I noticed that one of the springs on your brake appears to be in an incorrect...
    view full answer...
    Image 1 for
  • How to Pick Out Replacement Hubs for a 1980 Shore Landr Trailer
    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 wheels. I attached an FAQ article on determining bolt pattern for you to check out. Next thing you will need to know is what spindle you have on your trailer. In order to do that you can either get the inner and outer bearing numbers from a hub...
    view full answer...
    Image 1 for
  • Replacement 10-Inch Hydraulic Brakes, Seals, Bearings for Boat Trailer With 6000-lb Axle
    Thank you for providing specific capacities and dimensions for the replacement hydraulic brakes you need for your boat trailer. All of the hydraulic drum brakes we offer for 6000-lb rated axles are the 12 x 2-inch size. Our 10-inch hydraulic drum brake assemblies top out at a 3500-lb axle rating; please see the link provided. Demco # 40716 and # 40715 are examples. It is possible that your trailer manufacturer used a 6000-lb-rated axle with other components that are of lower capacity....
    view full answer...
    Image 1 for
  • 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
  • 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 the...
    view full answer...
  • Comparing Single Serve and Free Backing Functions on a Demco Free Backing Brake Assembly
    Single serve refers to the wheel cylinder in a hydraulic drum brake assembly. It is an entirely separate component from the free backing option. A single serve, or uni-servo, wheel cylinder uses a single plunger to push the brake shoes against the drum. When you are backing up, the wheel cylinder and the brake shoe springs work against each other. The dual spring and fall-away shoe design of the Demco free backing brakes allows the shoe to overcome the pressure from the wheel cylinder...
    view full answer...
  • Replacement Drum Brakes for 2000 Maxum Boat Trailer
    We carry both hydraulic and electric drum brakes for trailers in a range of sizes and for various axle weight ratings. We can help you select new brakes. The things you'll need to confirm are the axle's weight rating, the drum size, the type of brakes (electric or hydraulic) and the mounting bolt pattern of the brake flange. Axle capacity is usually listed on a plate or sticker right on the axle itself. Drum size can be determined by pulling one of the hub/drum assemblies and measuring...
    view full answer...
    Image 1 for
  • 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 your...
    view full answer...
  • What Braking Assemblies do I Need for Karavan Tandem Axle
    If the bolt pattern on your axles, for the backing plate, is 2-3/4 inch on center , both of these braking assemblies would fit your 10 inch x 2-1/4 inch trailer brake assemblies. Part # 40715 and # 40716 are what I would recommend. These are the left and right hand side brake assemblies. Since you are going to be backing up an incline you want the least amount of reverse braking which is why I recommend these over the other. The shoes for these assemblies are part # BP04-126. The part...
    view full answer...
  • Does Demco Hydraulic Brake Assembly # 40715 Include the Brake Drum
    The # 40715 Demco Rt. Hand 10 inch brake assembly is sold separately from the brake drum. If you'd care to reply with the inner and outer bearing reference numbers, along with the axle capacity and the wheel bolt pattern (see help article about how to determine this), I'd be happy to make some recommendations for you.
    view full answer...


< Previous
12



Do you have a question about this Accessories and Part?


Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Patrick B
Expert Research:
Patrick B
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee John H
Expert Research:
John H
Employee Adam R
Expert Research:
Adam R
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Victoria B
Expert Research:
Victoria B
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 Jeff D
Installed by:
Jeff D

At etrailer 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
<