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

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

Item # 18788

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Demco Hydraulic Drum Brakes Accessories and Parts - 18788
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Driver'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 18788 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" - Left Hand - 3,500 lbs. Accessories and Parts reviews from real customers.
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  • Reviews (37)
  • Q & A (7)
  • Videos (1)
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  • Why etrailer?

Demco Accessories and Parts - 18788

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

Driver'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: left hand (driver'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


SB18788M Demco Galvanized 10" Marine Trailer Brake Assembly - Single Servo - Left Hand







Video of Demco Hydraulic Drum Brake Assembly - Single Servo - Galvanized - 10" - Left 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 18788 Review

Today were looking at the Demco galvanized marine brake assembly part number 18788. This particular assembly is for the left hand side, we can tell this by looking at the shoe lining. The lining in the forward shoe is smaller than the lining on the rear shoe or primary. This means we have the left hand side. Couple this with the right hand side and it will create 3500 pounds in braking capacity. This is a single servo setup so we have one wheel cylinder and one piston that well push out against our shoe to create our pressure needed to create braking.

This particular setup is a 10 inch by 2 and . And how we find that measurement is by measuring across the lining to get our 10 inches and then measuring the show width to find out 2 and . When braking in reverse, this setup should create 25 percent braking in reverse. For installation its setup for a 4 bolt flange. You can see the bolts are predrilled to setup for your axle.

Then youll need to make a manual adjustment with the star wheel to push the brake linings out against the brake hub drum assembly. You want a light drag on your initial setup, then as the brake linings wear down, youll need to use the star wheel again to adjust the brake linings out but this can be down through the access hole here in the backing plate. And there you have it for our Demco galvanized 10 inch marine brake assembly, part number 18788.


Customer Reviews

Demco Hydraulic Drum Brake Assembly - Single Servo - Galvanized - 10" - Left Hand - 3,500 lbs - 18788

Average Customer Rating:  4.9 out of 5 stars   (37 Customer Reviews)

Driver'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.

- 18788
by:

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


Comments

It’s been about a year now and 5 or 6 trips up north to camp. Have a boat trailer that I will use this product on yet this fall.

John - 09/08/2019

60943

- 18788
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 508364



- 18788
by:

Great products at great prices! 504802



- 18788
by:

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:

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:

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



- 18788
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. 333472



- 18788
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. 313288



- 18788
by:

Perfect fit. Bolt on and go?? 279696



- 18788
by:

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:

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



- 18788
by:

Easy to install and fast shipping. 135602



- 18788
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. 90848



- 18788
by:

Works well. 67121



- 18788
by:

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



- 18788
by:

"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:

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:

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



- 18787
by:

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


Everything as expected. 695251



- 18787
by:

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


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:

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 508367



- 18787
by:

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


Great products at great prices! 505241



- 18787
by:

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


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:

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. 390840



- 18787
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. 342415



- 18787
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. 330907



- 18787
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. 310597



- 18787
by:

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


Great products with great prices. 214971



- 18787
by:

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


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



- 18787
by:

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


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:

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


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:

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


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:

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


Easy to install and fast shipping 135601



- 18787
by:

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


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:

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. 90847



- 18787
by:

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


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:

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


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


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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...

  • Recommendation for Installation of a Brake Mounting Flange on a Trailer Spindle and Axle
  • Welding a mounting flange, possible item # 4-35, is a very precise installation. The flanges need to be installed square and concentric to the hub and drum assembly and each other. If the flange is installed incorrectly rapid brake lining wear, improper braking, trailer dog legging, bearing failure, rapid tire wear and, worst of all, weakening of the axle can occur. Usually special jigs are used to install the flange. The jig will keep the flange square and concentric to the axle and...
    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...

  • 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...

  • 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...

  • Will Demco Hydraulic Drum Brake Assembly Fit Trailer Axle with 10 inch Hub/Drums
  • As long as you match up the bolt pattern of the brake assembly you have to the mounting flange of your trailer they will bolt right up. This is typically very easy since nearly all axles use the same 4 and 5 bolt mounting flanges. If your mounting flange has a 4 bolt pattern the part # 18788 that you referenced would bolt right up.
    view full answer...

  • Bolt Pattern Size on Galvanized Marine Brake Assembly 18787
  • The backing plate bolt pattern is 2-7/8 inches on center both ways (square). If we can help further let us know.
    view full answer...


Do you have a question about this Accessories and Part?




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Info for this part was:

Expert Research:
Robert G
Expert Research:
Jameson C
Updated by:
Laura H

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