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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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Shipping Weight: 10 lbs
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40716 - Hydraulic Drum Brakes Demco Accessories and Parts
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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 800-298-1624 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 (153)
  • Q & A (46)
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  • Why etrailer?

Demco Accessories and Parts - 40716

  • Trailer Brakes
  • Hydraulic Drum Brakes
  • Brake Assembly
  • Demco
  • 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
  • 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 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   (153 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:

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.



- 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.



- 40716
by:

received, installed, working good.


Comments
After getting the adjustment loose enough the brakes have performed well. I am pleased with the brake system.
Bob F - 05/14/2015



- 40716
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.


Comments
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.
Ron D - 07/05/2016



- 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.



- 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.



- 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 !



- 40716
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.



- 40716
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.



- 40716
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!



- 40716
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.



- 40716
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.



- 40716
by:

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


Comments
No problems. Satisfied customer
Paul B - 01/14/2016



- 40716
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.



- 40716
by:

The product was as advertised. It would have been nice if new bolts had been provided. I had gotten another set from another company and they included the 4 new bolts. I should have paid more attention. Not etrailers fault at all. It was as advertised. However, using old bolts to put on new brake drum assembly is not the best.



- 40716
by:

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



- 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.



- 40716
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.



- 40716
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.



- 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



- 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.



- 40716
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.



- 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



- 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.



- 40716
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.


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Show More Reviews

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...
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  • 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...
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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...
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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.
    view full answer...
  • 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...
  • 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
  • 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...
    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...
    view full answer...
    Image 1 for
  • 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.
    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...
    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...
    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...
    view full answer...
    Image 1 for
  • 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...
  • 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...
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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...
    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...
  • 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...
    view full answer...
    Image 1 for
  • 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...
    view full answer...
  • 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...
  • 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...
    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...
    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...
    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
  • 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...
  • 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...
  • 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 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...
  • 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...
    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...
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  • 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...
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