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Demco Hydraulic Drum Brake Assembly - Free Backing - Galvanized - 12" - Right Hand - 7,000 lbs

Demco Hydraulic Drum Brake Assembly - Free Backing - Galvanized - 12" - Right Hand - 7,000 lbs

Item # 42028
Retail:$114.13
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Demco RH Accessories and Parts - 42028
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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 5-bolt pattern. 1-800-940-8924 to order Demco accessories and parts part number 42028 or order online at etrailer.com. Free expert support on all Demco products. Great prices and Fastest Shipping for Demco Hydraulic Drum Brake Assembly - Free Backing - Galvanized - 12" - Right Hand - 7,000 lbs. Accessories and Parts reviews from real customers.
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Demco Accessories and Parts - 42028

  • Trailer Brakes
  • Hydraulic Drum Brakes
  • Brake Assembly
  • 12 x 2 Inch Drum
  • Demco
  • RH
  • Free Backing
  • 7000 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 5-bolt pattern.


Features:

  • Marine-grade hydraulic drum brake assembly is great for boat trailers
    • Designed for use with surge-type trailer brake actuators
  • Sturdy, corrosion-resistant steel construction
    • Galvanized backing plate
    • Stainless steel spring hardware
    • Zinc-plated wheel cylinder
  • Free-backing design lets you back up without engaging the trailer brake, even if the actuator is activated
    • Riveted, fall-away brake shoe only anchors on drum when brakes are engaged as trailer is moving forward
    • Periodic manual adjustment required
  • Mounting bolts sold separately
  • Made in the USA


Specs:

  • Configuration: right hand (passenger's side)
  • Dimensions: 12" diameter x 2" thick
  • Mounting flange bolt pattern: 5 on 3-7/8"
  • Wheel size: 14-1/2", 15", and 16"
  • Axle rating: up to 7,000 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.



SB42028M Demco Galvanized 12" Marine Trailer Brake Assembly - Freebacking - Right Hand




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Video of Demco Hydraulic Drum Brake Assembly - Free Backing - Galvanized - 12" - Right Hand - 7,000 lbs

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




Video Transcript for Review of Demco Trailer Brakes - FreeBacking Brake Assembly - 42028

Jeff: Hello, everybody. This is Jeff at etrailer.com. Today, we're going to take a look at Demco 12" x 2" right-hand passenger side galvanized hydraulic drum brake assembly for up to 7,000-pound axles. Now, this is a marine-grade hydraulic drum brake assembly. It's great for boat trailers. It's designed for use with surge-type trailer brake actuators.

It is a nice sturdy corrosion-resistant steel construction. And you can see it has the nice galvanized backing plate which helps for marine applications. It does use stainless steel spring hardware, and it has a zinc-plated wheel cylinder right up here.Now, this brake assembly is a free-backing design. If you notice this V-shape shoe right over here, that'll let you know that it's a free-backing brake assembly. And what a free-backing design does, it'll let you back up without engaging the trailer brake, even if the actuator is activated.

Basically, they have a riveted fall-away brake shoe right here. It'll only anchor on the drum when the brakes are engaged as the trailer's moving forward. And because this shoe makes only slight contact with the drum when it's in reverse, just enough friction is generated so that only a minimal amount of braking occurs when you're in reverse. So it basically will allow you to back up and reverse without the brakes totally applying.Now, it is a manual adjustment brake. You can see the adjustment wheel down here.

You do have to periodically manually adjust it. Now, the mounting bolts to install this; as you notice, it is a five-bolt brake flange pattern here. And the mounting bolts to install this are sold separately on our website. They're usually listed on this product page as a related product.A few specs on this. This is a right-hand passenger side assembly.

And usually when you get a new assembly, it'll have a sticker on it. You can see right here, it has an R for right-hand side. But if that sticker wasn't on there, the easiest way to tell what side this goes on is you look at the length of the pad on the brake shoe. So if you look at this pad, it goes from here to here. And if you look at this pad, it goes all the way from here to here. This is a longer pad. This one's the shorter pad. The shorter pad is your primary shoe. That'll always face the front of the trailer, so that'll tell you that this is going to go on the right-hand passenger side of the trailer.Now, this is designed for axles rated up to 7,000 pounds. The size on this brake assembly is a 12" x 2". And what those measurements are is the 12" is the diameter, so it's measured from here to here. So, if we get a . Really, you can see there's your 12" measurement. And the 2" would be the width of the pad that's on the brake shoe. There's your 2" wide. Now, this does require a 12" size brake drum. We had mentioned the mounting flange bolt pattern. When this installs onto your axle, it fits in five-bolt brake mounting flange. And the wheel size that's used on this is anywheres from 14.5" up to 16" diameter wheels. But that should do it for the review on the Demco 12" x 2" right-hand passenger side galvanized hydraulic drum brake assembly for up to 7,000-pound axles.

Customer Satisfaction Score:


Customer Reviews

Demco Hydraulic Drum Brake Assembly - Free Backing - Galvanized - 12" - Right Hand - 7,000 lbs - 42028

Average Customer Rating:  4.6 out of 5 stars   (20 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 5-bolt pattern.

by:

They are holding up pretty well. Rust on the star adjusters have rendered them useless. The hubs only show a little rust on the exterior, but substantial rust on the interior.

I believe I purchased a set of submersible trailer lights from you a few years ago. The lasted about a year and the LED lights started burning out. About half of them are now functioning. I would rate them as poor.

Thank you.




by:

I replaced the complete brake system on my trailer. I watched the video for install and proper adjustment. I completed my first trip to Florida and back to Maryland trouble free. 2263 miles
The brakes adjust easily, and stop well. They are well made and easy to install.




by:

Great product, price. Easy to install complete backing plate vs. brakes and new hardware.




by:

Quality parts. Fit great! Received shipment on time. I am buying more trailer parts from etrailer right now.




by:

One year of service on boat trailer and no problems. Very satisfied with quality and technical help.




by:

Good comunication. Great products at a very reasonable price. Very helpful and pleasant to deal with.

Thx Jim




by:

Good product fit perfectly. Trailer stops great again




by:

Excellent products, super fast delivery, in future I will continue do business with you




by:

Good experience all around. Product shipped quickly and bolted right up. Problem solved.




by:

No problems, the brakes came in on time and were as described.




by:




by:

Review from a similar Demco FreeBack 12 Inch in Accessories and Parts


I ordered the assemblies on Thursday expecting their delivery on Monday or Tursday but to my great surprise UPS delivered them on Friday. The salesperson I worked with, Karen was knowledgeable and courteous, simply fantastic. The new assemblies fit perfectly as simply as changing a pair of shoes. Thank you eTrailer.




by:

Review from a similar Demco FreeBack 12 Inch in Accessories and Parts


Product looks great, fit like a glove. Haven't tried with boat on the trailer, but everything worked perfectly with trailer empty. Wont take boat out of water till September, may know more then.




by:

Review from a similar Demco FreeBack 12 Inch in Accessories and Parts


Fit great. Nice quality. No issues at all.




by:

Review from a similar Demco FreeBack 12 Inch in Accessories and Parts


Installed easy. No problems.



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See what our Experts say about this Demco Accessories and Parts

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    I have confirmed with my contacts at Demco, that the Demco Hydraulic Brake Line Kit # DM5426 is coated with a galvanized finish. With the additional galvanized finish, it provides the additional corrosion resistance that you are looking for compared to steel brake lines. This brake line kit is also 3/16 of an inch in diameter, and is designed for use on single axle trailers. This kit includes lines and fittings needed to run brake fluid from your surge brake actuator to the trailer...
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    The difference in price, besides being from two different manufacturers, is the materials. Demco assembly # 42028 is galvanized steel. Titan assembly # T4489600 is Galphorite plated steel. So you could say that a galvanized material is superior to a plated one though the Galphorite is certainly a fantastic product. It also has a better warranty. The matching Titan right hand side assembly is # T4489500. Other than that there isn't a reason why you couldn't use either one provided they...
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  • Availability of Corrosion Resistant Brake Assemblies for Boat Trailer
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Info for this part was:

Employee Jeff D
Installed by:
Jeff D
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B

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