Demco Hydraulic Drum Brake Assembly - Single Servo - Galvanized - 10" - Right Hand - 3,500 lbs

Demco Hydraulic Drum Brake Assembly - Single Servo - Galvanized - 10" - Right Hand - 3,500 lbs

Item # 18787

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Demco Hydraulic Drum Brake Assembly - Single Servo - Galvanized - 10" - Right Hand - 3,500 lbs Brake Assembly 18787
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  • Trailer Brakes
  • Hydraulic Drum Brakes
  • Brake Assembly
  • Demco
  • 10 x 2-1/4 Inch Drum
  • RH
  • Single Servo
  • 3500 lbs
Passenger's-side hydraulic trailer brake assembly features a single-plunger design. 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 18787 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 - Single Servo - Galvanized - 10" - Right Hand - 3,500 lbs. Accessories and Parts reviews from real customers.


  • All Info
  • Reviews (36)
  • Q & A (26)
  • Videos (1)
  • Photos
  • Why etrailer?

Demco Accessories and Parts - 18787

Passenger's-side hydraulic trailer brake assembly features a single-plunger design. 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
  • Single-plunger design delivers 15 - 20 percent braking in reverse
  • Riveted brake shoes provide increased durability
  • 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"
  • Wheel size: 13" - 15"
  • Axle rating: up to 3,500 lbs
  • 1-Year warranty


SB18787M Demco Galvanized 10" Marine Trailer Brake Assembly - Single Servo - Right Hand





This Product Fits The Following Vehicles

2014 - 2014 Forest River Cherokee Travel Trailer 204RB

2019 - 2019 Forest River Cherokee Travel Trailer 214JT

2018 - 2019 Forest River Cherokee Travel Trailer 234VFK

2011 - 2017 Forest River Cherokee Fifth Wheel 235B

2017 - 2017 Forest River Cherokee Travel Trailer 244JR

2013 - 2013 Forest River Cherokee Fifth Wheel 245B

2010 - 2013 Forest River Cherokee Fifth Wheel 245L

2014 - 2015 Forest River Cherokee Travel Trailer 254Q

2010 - 2012 Forest River Cherokee Fifth Wheel 255S

2012 - 2014 Forest River Cherokee Travel Trailer 264BH

2016 - 2017 Forest River Cherokee Travel Trailer 264CK

2012 - 2018 Forest River Cherokee Travel Trailer 264L

2013 - 2013 Forest River Cherokee Travel Trailer 264U

2010 - 2011 Forest River Cherokee Travel Trailer 26L

2013 - 2013 Forest River Cherokee Travel Trailer 274BH

2014 - 2017 Forest River Cherokee Travel Trailer 274DBH

2010 - 2011 Forest River Cherokee Travel Trailer 27BH




Video of Demco Hydraulic Drum Brake Assembly - Single Servo - 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 Trailer Brakes 18787 Review

Today, we're looking at the Demco Galvanized 10" Marine Brake Assembly, part number 18787. This assembly is set up for the right-hand side. The way we can tell this by looking at the shoe lining itself. The forward shoe is going to be smaller than the rear shoe lining or primary shoe lining. This is a single servo setup, which means there is one wheel cylinder and one piston that comes out, creating a wedge effect inside the hub drum assembly. To tell the measurement of our shoe for setup, we simply measure across the linings and see that we get 10" in our width.

And then the thickness of the width of the shoe lining itself is 2-1/4". So this is a 10" x 2-1/4" setup. When we take this setup and couple it with the left-hand side, we create 3,500 pounds in braking capacity. This setup also produces 20% braking capacity in reverse. When bolting up to our axle, we have 4-on-4 bolt up holes drilled to bolt up to the axle.

This is 4-on-4 centers. You see the holes are pretty drilled into the backing plate to go on to the axle-mounting (plank). On your initial setup, you use a star wheel adjusted to just the shoe linings out to meet the hub drum surface. You want to create a light drag on your initial setup. Then as the shoe linings wear down, you can simply remove the access plug here in the backing plate and adjust the star wheel adjuster out to keep that light drag as the shoe linings wear down.

And there you have it for our Demco Galvanized 10" Marine Brake Assembly, part number 18787.


Customer Reviews

Demco Hydraulic Drum Brake Assembly - Single Servo - Galvanized - 10" - Right Hand - 3,500 lbs - 18787

Average Customer Rating:  4.9 out of 5 stars   (36 Customer Reviews)

Passenger's-side hydraulic trailer brake assembly features a single-plunger design. Galvanized steel resists rust, making the assembly great for boat trailers. Mounting flange has 4-bolt pattern.

- 18787
by:

I have great service with Etrailer. Ordered the wrong part,called and was completely taken care of. Easy to do business with. 655246



- 18787
by:

Put new brakes,drums, bearings and seals and hubs on boat trailer found all parts here and received really fast always order parts for trailers here and always will 508367



- 18787
by:

Great products at great prices! 505241



- 18787
by:

Parts arrived exactly as described and worked perfectly. Great price, shipping was fast considering how far it had to come and arrived when it said it would. I've already ordered more parts from here and will continue to in the future. 497330



- 18787
by:

So happy i found etrailer. They had the quality parts i had been looking for at a great price. I am equally happy with the speedy free shipping. I recieved the brake assemblies and installed them in less time than it took to locate them. Thank you. You will be my go to trailer parts supplier for all future parts. I have 5 different trailers and am sure i will require your services. Robert K. 390840



- 18787
by:

Very simple to install. Unbolted old and installed new and adjusted. So easy even a caveman could do it. 342415



- 18787
by:

When I realized my brakes were in need of repair and no local shop worked on trailer brakes I decided to do it myself. With the help of the etrailer folks I had a new set of brakes and was ready for another fishing season. Great products, they do what they say and great customer support. 330907



- 18787
by:

These worked great. Much easier to replace the whole assembly like this, than replacing all of the original rusted out components. These are galvanized, so they should last a long time. I'm using these for a boat trailer for a 21 foot fiberglass euro styled V8 powered pleasure boat that weighs about 3000 pounds. 310597



- 18787
by:

Great products with great prices. 214971



- 18787
by:

As advertised, no problem to swap the old with the new. 213528



- 18787
by:

Great products. Expert helpful videos for adjustment and installation. OEM parts and cross referencing made easy. Will buy products again on next axle rebuild. 213238



- 18787
by:

After going to numerous trailer stores and auto part stores in my home town I called Bill at etrailer. I found Bill to be very professional and helpful.. The package was ordered on Monday afternoon and was on my door step on Wednesday afternoon. The item was exactly what I had ordered. I will continue to purchase my trailer needs from Bill. 175238



- 18787
by:

Good product should coat all with non corosive coating and provide pre drilled wash out ports. Cad or Zinc plated bolts would be good as have to track down at an auto parts store and wern t plated. 174789



- 18787
by:

Easy to install and fast shipping 135601



- 18787
by:

The product was first quality. It was packaged very well. Easy to install and yes, I wished I had ordered new bolts and nuts. Mine were a little bit rusty being on a boat. The only differences I noticed were that my old wheel cylinder was made of aluminum and this one was made of steel. Steel will rust but it will probably last longer. 135126



- 18787
by:

Nice quality product. Easy to install... Well, as easy as any brake job could be. Spend a little bit and buy new bolts when you do this job. 90847



- 18787
by:

Good price and bolted up perfect! Etrailer.com has great prices and fast shipping when you need your parts fast. This is the 3rd complete trailer rebuild and I wouldn't think about buying from any other supplier. Bobby M. Maryland 71814



- 18787
by:

Perfect fit. Just with it came with nuts and bolts. 38408



- 18788
by:

Review from a similar Demco Demco Galv Single Servo 10 Inch in Accessories and Parts


Afternoon job for both left and right side of 2000 Jayco pop up camper. Cheaper and easier than break job. Fast shipping. 563046



- 18788
by:

Review from a similar Demco Demco Galv Single Servo 10 Inch in Accessories and Parts


Put new brakes, drums, bearings and seals and hubs on boat trailer found all parts here and received really fast always order parts for trailers here and always will 508364



- 18788
by:

Review from a similar Demco Demco Galv Single Servo 10 Inch in Accessories and Parts


Great products at great prices! 504802



- 18788
by:

Review from a similar Demco Demco Galv Single Servo 10 Inch in Accessories and Parts


Like the assembly being galvanized to last longer and already assembled. Being labeled for left and right is a nice added touch, but not necessary with single piston cylinders. I added a flush kit to my trailer and had to drill a hole through the plate to add, not a problem. 432696



- 18788
by:

Review from a similar Demco Demco Galv Single Servo 10 Inch in Accessories and Parts


So happy i found etrailer. They had the quality parts i had been looking for at a great price. I am equally happy with the speedy free shipping. I recieved the brake assemblies and installed them in less time than it took to locate them. Thank you. You will be my go to trailer parts supplier for all future parts. I have 5 different trailers and am sure i will require your services. Robert K. 390839



- 18788
by:

Review from a similar Demco Demco Galv Single Servo 10 Inch in Accessories and Parts


Very simple to install. Unbolted old and installed new and adjusted. So easy even a caveman could do it. 340229



- 18788
by:

Review from a similar Demco Demco Galv Single Servo 10 Inch in Accessories and Parts


When I realized my brakes were in need of repair and no local shop worked on trailer brakes I decided to do it myself. With the help of the etrailer folks I had a new set of brakes and was ready for another fishing season. Great products, they do what they say and great customer support. 333472



- 18788
by:

Review from a similar Demco Demco Galv Single Servo 10 Inch in Accessories and Parts


These worked great. Much easier to replace the whole assembly like this, than replacing all of the original rusted out components. These are galvanized, so they should last a long time. I'm using these for a boat trailer for a 21 foot fiberglass euro styled V8 powered pleasure boat that weighs about 3000 pounds. 313288



- 18788
by:

Review from a similar Demco Demco Galv Single Servo 10 Inch in Accessories and Parts


Perfect fit. Bolt on and go?? 279696



- 18788
by:

Review from a similar Demco Demco Galv Single Servo 10 Inch in Accessories and Parts


brakes hubs and bearings arrived very fast.all parts fit perfect.sales person was excellent in helping me with the boat trailer parts.thank you 242571



- 18788
by:

Review from a similar Demco Demco Galv Single Servo 10 Inch in Accessories and Parts


Great products. Easy cross referencing from old to new replacement. Great info video. 215799



- 18788
by:

Review from a similar Demco Demco Galv Single Servo 10 Inch in Accessories and Parts


Easy to install and fast shipping. 135602



- 18788
by:

Review from a similar Demco Demco Galv Single Servo 10 Inch in Accessories and Parts


Nice quality product. Easy to install... Well, as easy as any brake job could be. Spend a little bit and buy new bolts when you do this job. 90848



- 18788
by:

Review from a similar Demco Demco Galv Single Servo 10 Inch in Accessories and Parts


Works well. 67121



- 18788
by:

Review from a similar Demco Demco Galv Single Servo 10 Inch in Accessories and Parts


Great product and fit perfect Great service and will order again! 55852



- 18788
by:

Review from a similar Demco Demco Galv Single Servo 10 Inch in Accessories and Parts


"great product low price" quote is valid. bolted right up. Note: I have a boat, and the only thing missing on the backing plate is the half inch hole for my water flush out that was on my old ones, had to drill one next to the flange mount. I packed a little extra grease in the calipers too. 41921



- 18788
by:

Review from a similar Demco Demco Galv Single Servo 10 Inch in Accessories and Parts


Perfect fit. Works great. I wish I had known it didn't come with nuts and bolts. Other than that it was perfect. 38407



- 18788
by:

Review from a similar Demco Demco Galv Single Servo 10 Inch in Accessories and Parts


At my door today quick ship great communication have not installed yet but don't anticipate any issuses 26222


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Ask the Experts about this Demco Accessories and Parts
Do you have a question about this Accessories and Part?


  • I Want to Replace All of the Surge Brake Equipment on a 2002 Performance Boat Trailer
  • The surge brake equipment of your trailer consists of the brake lines, drum brakes and the brake actuator. To ensure I recommend the correct parts for your trailer I will need a little more information. A brake line kit is pretty universal. For a single axle trailer, I recommend using part # T4829900. This kit comes with all of the lines and fittings you will need to replace everything from the actuator to the brake assemblies. For an actuator, I would need to know what type of...
    view full answer...

  • Will Surge Actuator Master Cylinder Fill Up with Fluid When Pistons are Compressed
  • When you force the pistons down in the caliper to install new pads you will end up forcing the fluid back from the calipers into the master cylinder since it has no where else to go. So it will fill the master cylinder up. The system is designed for massive amounts of pressure so I really doubt you blew any seals by compressing the pistons like you did. I would try taking the trailer around the block to make sure it's not leaking though just to be sure.
    view full answer...

  • Troubleshooting Surge Trailer Brakes that Make Hammering Sound When Applied
  • I bet it's a worn out suspension component that's flexing as the trailer pushes into the surge brake actuator and once the brake applies it pulls itself back and repeats the process quickly causing the hammering sound you are experiencing. Check out the suspension of the trailer to see if you can find any worn components that would cause this and fix as needed.
    view full answer...

  • Trailer Surge Coupler Can be Pushed in By Hand and Brakes are Weak
  • The coupler should be very difficult to push in by hand but it doesn't return on its own. There is likely a problem inside your coupler that will need to be addressed to get it working properly again. It is most likely the shock that is inside. There are replacement shocks but I would need to know the manufacturer and model of the coupler you have. I have included a link to the shocks we carry. If you can't find a part number or manufacturer on the coupler then you may be able to find...
    view full answer...

  • How to Know When a Trailer Coupler Shock is Bad
  • If your trailer wants to slam forward and back as you apply the brakes of your tow vehicle the shock is bad and needs to be replaced. When a shock goes bad it no longer dampens the movement of the actuator which causes what I described. If the shock you have can easily be extended and retracted then it needs to be replaced. I attached a page that has all of the replacement shocks we offer.
    view full answer...

  • Removing Surge Coupler-Actuated Brakes from Mc Clain Boat Trailer
  • If you want to deactivate the hydraulic brakes on your boat trailer, you can certainly do so. The simplest way to do this would be to drain the brake fluid from the lines by disconnecting the brake lines from the wheel cylinders and allowing the fluid to drain. You'd then immobilize the articulating portion of the coupler by drilling holes in either side and sliding a bolt through to prevent the coupler from compressing. A better long term option would be to remove the coupler and replace...
    view full answer...

  • Electric Reverse Lockout On Boat Trailer Surge Coupler is Not Working
  • On a trailer that has a surge coupler, if the trailer does not have a manual or electric reverse lockout or free-backing brakes then the brakes will engage when backing up. Free-backing brakes are only available in drum brake applications. So you would have to have a coupler that has either a manual or electric reverse lockout feature. It sounds like you have an electric lockout. An electric lockout will be at the back of the master cylinder. It will be grounded to the trailer frame...
    view full answer...

  • Troubleshooting Surge Brakes Locking up When in Reverse
  • With surge brakes, you have a brake actuator applying the needed pressure to the brakes but to be able to back up you will need to have a manual lockout or an electric lockout solenoid, like # T4748800, which will close when you shift the vehicle into reverse, allowing the trailer to be backed up. You may also need a solenoid cover like the Titan # T4835800183, depending on what brake actuator you currently have. Typically surge brakes are found on boat trailers, and commonly the...
    view full answer...

  • Solution to Allow Trailer with Surge Brakes to Back Up
  • You can install free-backing brake assemblies that won't activate when the trailer is backed up or you can install a lockout on the actuator. I attached a link to a page that has all of the free-backing assemblies we carry for you to check out. You'd need to measure the dimensions you currently have and then match the size you need by selecting it from the filters on the page. I'd need to know what brand of surge actuator you have to pick out the correct lock out you'd need.
    view full answer...

  • How To Check if Trailer Surge Brakes Are Working Properly On Tandem Axle Boat Trailer
  • Checking the brakes can be done in two ways. The easiest way is to raise one side of the trailer and spin the wheels while someone applies the surge brakes at the coupler. The better way would be to remove each of the wheels and brake drums and activate the brakes while making sure the wheel cylinders and brake assemblies are functioning properly. After this the first thing I would do is bleed the brakes using the trailers surge coupler to force the fluid from the brake lines and make...
    view full answer...

  • Solution for Surge Trailer Brakes that Activate When Backing Trailer Up
  • Surge brakes will activate when backing the trailer up unless you do one of two things to address the problem. You can install free-backing brake assemblies on the trailer (I attached a link to a page that has all of the ones we carry) or you can use a reverse lockout solenoid which will prevent hydraulic pressure from making it to the wheel cylinders when the reverse light circuit activates the solenoid. If you have a Titan actuator you would need the part # T4748800 or if you have...
    view full answer...

  • How to Determine if Trailer Brakes are Require for a Boat Trailer
  • That is going to depend on a few things. You will need to check with your local DOT to see what the requirements are for trailer brakes. You will need to know the weight of your trailer as well. Depending on the weight of your trailer will also affect how many brake axles are required. I attached a couple help articles on adding brakes to a trailer for you to check out as well.
    view full answer...

  • Disc Trailer Brakes are Weak on One Side After Replacing Calipers and Pads and Bleeding Brakes
  • Like you said, you don't want the trailer wheels to lock up all the time. They should stop the wheels proportionally to how much force is exerted on the actuator. With that said it could be that you are not physically pushing in the actuator all the way to reach lock up. There could also be a leak somewhere but I think you would notice fluid dripping out. Sometimes the brake lines are not large enough depending on how far the actuator is from the calipers. A larger diameter brake line...
    view full answer...

  • Drum and Hub Kit, Wheel, and Brake Assembly Recommendation for a 2009 Starcraft 2106
  • I did some research and found that all of the hub and drum assemblies that would fit on your spindle would be 10 inches in diameter, and I also found that if you have a 10 drum you have to have at least a 13 inch rim, so you would need to upgrade to bigger wheels and tires also. The Trailer Hub & Drum Assembly, part # 84546UC3-EZ, that you referenced is the correct hub and drum assembly. For brake assemblies I would recommend a Galvanized 10 inch Marine Brake Assembly, part # 18788,...
    view full answer...

  • Determining if Replacement Shock is Needed for Brake Actuator
  • A shock like the Replacement Shock # T1242600 for Titan Model 6 and 10 Brake Actuators is essentially designed to dampen the movement of the actuator. There are a couple things you can do to see if a replacement is in order. First, if you find that your trailer is slamming forward and back as you apply the brakes in your tow vehicle, this is an indication that the shock has gone bad. Also see if the shock can easily be extended and retracted without any resistance. This would also indicate...
    view full answer...

  • Will Hydraulic Disc Brakes Still Activate if Power to Trailer is Lost
  • With surge type hydraulic brakes on a trailer they will still stop the trailer regardless if the trailer wiring loses it's connection. That's actually an advantage to this style of braking. If you have electric over hydraulic brakes that have an actuator that is controlled by an electric signal from a brake controller you would then lose brake power if the trailer lost it's connection. Typically it's corrosion on the trailer connectors that causes the connection to be lost. Cleaning...
    view full answer...

  • Boat Trailer Brake Assembly Recommendation for a 3500 UFP Axles
  • Yes, the Demco Hydraulic Drum Brake Assembly # 18787 would be the correct assembly for the right hand side of your trailer and the part # 18788 would be the correct assembly for the left hand side of the trailer. If your current brake assemblies only have a 1-3/4 inch width they are not fully utilizing the 2-1/2 inches of drum width that you measured. The bolt pattern of the flange is also the same as what you have. Check out the picture I attached to see these measurements. These...
    view full answer...

  • Surge Brake Actuator Recommendation for Use with Assemblies 18788/18787
  • The brake assemblies # 18788 and # 18787 are not free-backing. For picking out an actuator the part # 8605001 would work well as it has more capacity than you'd need, is for drum brakes, and is for a 2 inch hitch ball.
    view full answer...

  • Troubleshooting Surge Brake Actuator that Won't Release Brakes
  • Sounds like your trailer has an electric reverse lockout which prevents the brakes of your trailer from applying so that you can back the trailer up. If now the brakes won't release after the issue you had with someone else backing up the trailer that sounds like a mechanical problem. Possible something has bent inside the surge actuator which won't allow the inner piece to slide forward and release the brake pressure. You should inspect the coupler looking for any damaged or bent components...
    view full answer...

  • Troubleshooting Trailer Brakes Locking Up When Driving Forward
  • Unless the trailer became completely unattached from your tow vehicle causing the breakaway pin to be pulled out, forgetting to lock the coupler to the hitch ball, while certainly something you want to double check the next time you tow, would not have caused the trailer brakes to engage during travel. The brakes locking up when going forward was likely caused by some kind of short in the trailer wiring. I recommend inspecting the brake output wire on the trailer for any exposed portions...
    view full answer...

  • How to Find Surge Coupler, Wheel Cylinders and Bearings for 1997 Eagle Double Axle Boat Trailer
  • For the actuator, you'd want to choose one compatible with drum brakes with sufficient capacity for the weight of your trailer. You'd also need to choose between a bolt-on or a weld-on application, the trailer ball size and the lock-out desired (none, manual or electric). You can see our selection by clicking the provided link. The wheel cylinder is a likely place to check for leaks, but if the trailer's been sitting for awhile, you might be better off replacing the brake assemblies,...
    view full answer...

  • What Causes a Trailer With Surge Brakes To Lockup While In Reverse
  • The issue your friend is having with his trailer is a mechanical one so we can rule the vehicle out. The reasoning for this is because the only way you would have been able to back up the trailer with using just a 4-way trailer connector is if you either physically applied a manual lockout or the trailer had free backing braking assemblies. Surely you would know whether or not the manual lockout was used or not so that leads me to think you have free backing braking assemblies. The free...
    view full answer...

  • Troubleshooting Reverse Light Fuse Blowing and Reverse Lockout Solenoid Wiring getting Hot
  • It sounds like the problem is in the wiring of your reverse lockout solenoid. Most likely the circuit is shorting out somewhere and is causing the circuit to over-draw which is why the fuse is popping and the wire is getting hot. I would inspect the wiring of the circuit and see if you can find any obvious signs of a short and fix as necessary. Cut or exposed wiring or corrosion can cause shorts. I attached an FAQ on trailer wiring for you to check out also.
    view full answer...

  • Mounting Hardware Recommendations for a Brake Assembly # 18787
  • You will need to provide the mounting hardware to install the Brake Assembly # 18787. For bolts you will want Brake Mounting Bolt # 7-75 For locking washers you will want a Lockwasher for Brake Mounting Bolt # 5-8 For nuts you will want a Nut for Brake Mounting Bolt # 6-17 I also attached a video of a brake assembly being installed for you to check out also.
    view full answer...

  • Troubleshooting Weak New Hydraulic Drum Trailer Brake Assemblies
  • Keep tightening them until you feel a light drag as you turn the wheel. That should give you the proper tightness to lock up the wheels. Sounds like they are still too loose. Also you should try towing to see how it performs then.
    view full answer...

  • Troubleshooting Trailer Surge Brakes That Activate in Reverse with New Truck
  • A surge coupler/actuator will activate the brakes on the trailer unless it has a lockout feature, either a manual lockout as with coupler # T4500600 or an electric lockout as on part # T4339720. Since the same trailer backs up without any problem using your other truck, the 2012 F-150, most likely that truck has a reverse light circuit present on the trailer wiring to deliver a lockout signal for the coupler's solenoid. If your new truck has only a 4-pole wiring setup then you'll just...
    view full answer...


Do you have a question about this Accessories and Part?




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Info for this part was:

Photos by:
Jackie C
Expert Research:
Michael H
Expert Research:
Jeff D
Expert Research:
Jameson C
Expert Research:
Adam R
Updated by:
Laura H
Photos by:
Jim W

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