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

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

Item # 40715

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Demco Hydraulic Drum Brake Assembly - Free Backing - Galvanized - 10" - Right Hand - 3,500 lbs Free Backing 40715
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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. Call 800-298-8924 to order Demco accessories and parts part number 40715 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" - Right Hand - 3,500 lbs. Accessories and Parts reviews from real customers.
  • All Info
  • Reviews (146)
  • Q & A (33)
  • Videos (2)
  • Photos
  • Why etrailer?

Demco Accessories and Parts - 40715

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


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







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


Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Demco Hydraulic Drum Brake Assembly Installation

Today on our trailer, we'll be installing the Demco Hydraulic Brake Drum Assembly, 10"x 2-1/4" in size on the left-hand or driver side, part number 40716. For the right, or passenger side, part number 40715. To begin our install, we'll first go ahead and remove the wheels. To remove our hub drum assembly, we'll go ahead and first remove the dust cap. Next, we'll remove the castle nut. Once the castle nut's out of the way, we'll go ahead and pull the washer and outer bearing. Now with those out of the way, we can go ahead and remove the hub drum assembly. There are four fasteners that will need to be removed. Here looking from the outside in, we can see the bolt that goes through the backing plate and gets secured with a nut on three of the attachment points, and it's reversed here on the other one because if the bolt came through, it'd interfere with the wheel cylinder.

So the nut is on the back side of the backing plate for this attachment point. Note, we will not be reusing the old hardware as we have new hardware to install. Now we're ready to install the new backing plate and wheel cylinder. To determine if you've got the driver or passenger side set of backing plates without any identification, we'll look at the shoe length. The largest shoe goes to the rear of the trailer. We turn it around, we can see that this is marked for left, or driver side. And then we've got a brake line inlet for the wheel cylinder and the rubber cap covering up the brake bleeder. We're now ready to go ahead and install the backing plate.

Note, we're going to secure it with a new bolt, split-lock washer, and nut. Here's a way to remember it, is put the bolt through the backing plate, and then through the axle. Now, we'll tighten each fastener down finger tight until we have them all in place. With all of our hardware in place, we can go ahead and tighten each fastener down. Next, we're ready to reinstall the hub drum assembly. Slide the hub drum assembly on, and then our outer bearing. After the bearing, we put on our flat washer, the castle nut keeper, and then our castle nut.

Go ahead and use the castle nut to seat the bearings and to set our free load. Then we'll bend the tabs of the keeper over to prevent the castle nut from backing off. Now, because we have the easy lube axles with the grease zerk in it, we can take our grease gun and add additional grease as necessary. Once we have it fully greased, we'll then go ahead and reinstall the dust cap. We can use the access holes on the back side of the backing plate by removing the rubber grommet and adjusting up the brake shoes tp fit the drum assembly. And that does it for the install of the Demco Hydraulic Brake Drum Assembly, part number 40716 on our trailer. .


Customer Reviews

Demco Hydraulic Drum Brake Assembly - Free Backing - Galvanized - 10" - Right Hand - 3,500 lbs - 40715

Average Customer Rating:  4.8 out of 5 stars   (146 Customer 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.

- 40715
by:

Product fit my trailer perfectly. Was exactly the same as the assembly it replaced, just new and working. The pads on my old assembly were worn down, and the wheel cylinders were seized. One thing that would be nice is some advice on how to bleed this hitch actuated trailer brakes. It's not an easy job, being that a great deal of force is required at the hitch in order to push the fluid through. (Being that it is meant to be actuated by the trailer's weight. I used a piece of lumber propped on the pavement to leverage the hitch in to push the fluid through. Wondering if there might be a better way to do it . . . Great product, fast delivery! 641511



- 40715
by:

Item is as advertised. It was quicker easier and cheaper to replace the whole backing plate assembly. If I had replaced brake shoes, wheel cylinder, and spring kit I would have spent more money & time. I will use etrailer for all of my trailer needs. etrailer even upgraded my shipping at no extra charge. Thank you for the great service. 585186



- 40715
by:

I was satisfied with the drums and brake units supplied by Etrailer. The wheel bearings were junk so I trashed them, and repacked the Timkin's that were already on the trailer. I was pleased with the support I received from Etrailer ensuring the correct items were ordered to avoid returns. 547656



- 40715
by:

Good product that works as it should 432971



- 40715
by:

Hi The backing plates did not arrive on the day they were going to be here. They were going to be here on the 12th and didnt show up till the 13th. Please do away with the UPS charge of 168.00 dollars. It was going to be next day shipping that didnt happen. Thx for your help Victor Hayton order #105764522 432291



- 40715
by:

Perfect replacement for my old rusted boat trailer brakes. Assembly was straight forward. Brakes release well in reverse. All I could ask for. 413990



- 40715
by:

All parts are doing well. There have been no issues with anything. 408757



- 40715
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. 396145



- 40715
by:

Exactly what I ordered, will definitely use you again. Thanks 382897



- 40715
by:

This part fit 100%. I got the best price from etrailer and I'm so happy that I could install it easily. My brake cylinder was leaking and this was the best way to go to replace the whole unit. I will be ordering the other side this year. Thanks etrailer. PS I'm from Canada and shipping wasn't a problem. I live in Vancouver aND ordered it to blaine aND it arrived really fast. Thanks again 380397



- 40715
by:

Was easy to install and pricing was gre at. 378126



- 40715
by:

My trailer now pulls and stops great thanks to etrailer !! 366380



- 40715
by:

having problems with the brakes locking up 363166



- 40715
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. 353125



- 40715
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 ! 324878



- 40715
by:

excellent product at a affordable price. will have my tow dolly back like new again. 316024



- 40715
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. 312589



- 40715
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!!! 306983



- 40715
by:

No issues with the install 303155



- 40715
by:

Great products, great prices and great service. what more can I say? 297004



- 40715
by:

Great product, quick delivery and easy install! Will definitely order from Etrailer again. 294339



- 40715
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! 293947



- 40715
by:

Great product and price. Perfect fitment. Great turnaround shipping. 277419



- 40715
by:

Upgraded trailer with this system Stops on a dime now 276783



- 40715
by:

I have a 1996 E Z Loader Boat trailer that needed a brake job. Couldn't get any satisfaction calling around to find parts until I found the etrailer web site. Everything I needed was laid out easy to find and the prices were fantastic. I compared buying one bearing seal at an auto parts store and found I could do the bearing, race and seal for less on etrailer. They shipped everything as I had ordered and they actually arrived earlier than expected. My mechanic said it was one of the easiest brake job that he ever had to do due to the fact everything was preassembled. I have passed this site on to all my Bass fishing buddies. 276538


Comments

Best bang for your buck. Have not had one issue with my new trailer brakes. Hope these last another ten years as I know the trailer wont.

Ron C - 07/26/2017

26620

- 40715
by:

I used to have to stop before going down a hill to disengage my brakes so I could stop barely, then back up hill into my driveway. These brakes work great. I would recommend them and also I would recommend the hub and drum assembly. By the time I put new bearings and races in and turned the drums I wish that I would have bought new ones for my trailer that sees a lot of saltwater. 269854



- 40715
by:

The brakes on my 30-year-old boat trailer locked up and would not release. I purchased a set of these Demco brake drum assemblies and installed them myself. It was my first attempt at repairing a hydraulic surge brake system. Before beginning the remove and replace process I watched a “how to video” on the etrailer website. Everything went well, the system now functions as required. Over the years I have purchased a lot of product from etrailer. I have received excellent product and service everytime. 269701


Comments

After one year the complete brake system is working perfectly.

John - 07/09/2017

25842

- 40715
by:

Very good brake units. 265382



- 40715
by:

I ordered both the 40715 and 40716 . They were packed well and look good, should work just fine. 252864



- 40715
by:

I am so glad I found the etrailer website. The product fit perfectly, was simple to mount, the shoes were nearly adjusted out of the box and the price is too good to be true. I would recommend this to anyone. 251071



- 40715
by:

Very well made and easy to install. Excellent service and price. So happy I ordered from etrailer. 243699



- 40715
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. 243489



- 40715
by:

Extremely fast delivery and very well made. Harder to install than the video indicated but not due to the quality of the 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. 241136



- 40715
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. 240712


Comments

Very satisfied with these brakes. They grab a little when first coming out of the water, but that goes away after the first stop.

Steven S - 03/23/2017

22939

- 40715
by:

Great product for boat trailers, made renewing my brakes easy. 234005



- 40715
by:

:) It was great doing business with your company.. 223478



- 40715
by:

Fast order great product and price 218510



- 40715
by:

Very pleased with deliver and service. 216855



- 40715
by:

These brakes are a breeze to install! I put them on my boat trailer which I launch in salt water, so it would have been nice to have a washout port (the reason I didn't give them an excellent rating). The price is good and the install is easy, so if I get a couple years out of them I'll be happy. 212934



- 40715
by:

Very Happy---- we had the trailer up and running in less than 90 minutes (both sides). Salt water is hard on things even thou I fresh water wash after every use. Good to go another 5 years... 205951



- 40715
by:

Bought a set of these and a master cylinder for my single axle boat trailer..and now I have surge brakes. Yea! Products were of excellent quality and exactly as displayed and shipping was prompt and the order process was a breeze! Great company to do business with and the prices are excellent too! 199942


Comments

It has been a year and I still have great surge brakes..thank you very much!

Lew A - 06/01/2016

18221

- 40715
by:

Outstanding quality. Exact replacement part. Made the project a breeze. Thanks. 194698



- 40715
by:

Great product with excellent service!i 193609



- 40715
by:

Fast shipment and item worked great! 190686



- 40715
by:

Goodproduct so far fast shipping 184269



- 40715
by:

Bought a pair, left and right. Totally assembled, ready to bolt on. Fast shipping! 176203



- 40715
by:

everything correct 172369



- 40715
by:

Much fast and better than rebuilding the worn out assembly! bolt on and done! 157975



- 40715
by:

Looked just like the originals except no rust. Haven't tried them on the road yet. 155949



- 40715
by:

Just what we ordered. Thanks 149660


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Ask the Experts about this Demco Accessories and Parts

Do you have a question about this Accessories and Part?


  • 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...
    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 #...
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  • 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.
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  • 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...
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  • 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...
    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...

  • 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...
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  • 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...
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  • 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...
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  • Hydraulic Drum Brakes Recommended with Demco Hydraulic Trailer Brake Actuator
  • With a broken master cylinder and shock, replacing the actuator is a great plan. The Demco Hydraulic Trailer Brake Actuator # 8605001 will work great with the Demco Hydraulic Drum Brakes # 40715 and # 40716 that you referenced. Since the actuator # 8605001 doesn't have a reverse lockout, the free-backing brakes will work great for you. Usually, free-backing brakes are more reliable than reverse lockout couplers. I have attached an installation video of the Demco Hydraulic Trailer...
    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...
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  • 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...
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  • 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...
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  • 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...

  • 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...
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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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  • Recommendations for Hydraulic Brake Assemblies on a 1993 Trail Rite 3500 Pound Boat Trailer
  • Whether you ultimately decide to go with free-backing or not, I would recommend getting galvanized brake assemblies. The springs are stainless steel and the plates are galvanized which will help them hold better since you have a boat trailer and the brake assemblies maybe exposed to more water. I like the free-backing systems better. They will make backing down a boat launch a bit smoother, especially if someone else is backing the vehicle in while you are in the boat pulling off the...
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  • 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...
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  • Brake Assembly for Use with Dexter Galvanized Trailer Hub and Drum # 8-247-50UC3
  • Since your boat and trailer will be used in salt water a galvanized hub/drum is a good idea to give you some corrosion protection. With this hub you can use Demco Galvanized Free Backing Hydraulic Drum Brake Assembly # 40716 (left) and # 40715 (right). These are suitable for a 3500-lb axle and a 4-on-4-inch brake flange mounting pattern. I have linked an installation video for your reference. Even when using galvanized components, it is a good idea to rinse the trailer with fresh water...
    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...

  • What is the Mounting Hole Pattern for Galvanized 10 Inch Marine Trailer Brake Assembly 40715
  • The Demco hydraulic drum brake assembly, # 40715, mounts to a standard 4-bolt mounting flange like # 4-35. The bolt holes are 2-7/8 inches apart on center. If measuring diagonally from a top hole to a bottom hole it is 4 inches on center.
    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...

  • 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....
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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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  • 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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  • 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...
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  • 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.
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