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.
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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.
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.)
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.
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Average Customer Rating: 4.8 out of 5 stars (151 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.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.
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.
John - 07/09/2017Great 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.
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.
Ron C - 07/26/2017Bought 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!
Lew A - 06/01/2016Product 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!
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
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.
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.
Steven S - 03/23/2017Replaced original Dico brakes on trailer for 20' Maxxum without a hitch. Buying the complete assembly is the way to go. Thanks etrailer.com!
Dean H - 07/17/2015Perfect replacement for my old rusted boat trailer brakes. Assembly was straight forward. Brakes release well in reverse. All I could ask for.
I spent a lot of time trying to clean the grease and dirt off my old ones to try to salvage them after replacing bearings and leaky seals that made a big mess out of my brakes. And, removed worn out shoes by messing with all the springs, before I found these, the whole assembly put together already, and galvanized. I bought four and simply installed them with four bolts. Also added a new actuator, tested the brakes, and they work great. Installed on a 1991 Tracker trailer. Like new again, and saved hundreds doing it myself. Wished I knew about this product sooner.
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.
these replacments for my boat trailer were and are very good and have held up to my standards for me , nice and easy replacment !
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.
Excellent quality. Installed easy with all 4 brakes assembly. Confidentiality!!!!
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.
Received the brake assembly, installed it with no problems. Easiest brake job I have ever done, 4 bolts attach the brake line, adjust the brakes and you are done. I had a question on the flange bolt spacing. The 4 on 4" is a diagonal measurement. If you look at the picture of the brake assembly above the spacing of top left to top right is 2 7/8", diagonal top left to bottom right is 4" This fit my application perfectly.
Hydraulic trailer drum brakes. Received within a few days. Easy to install, not that complicated. Needed a second person to help bleed the brakes.
Delivery was sooner than expected. Packaged properly. Brake assembly was clean and quality parts. Installation was a breeze. Compliments to a well run business
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.
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.
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.
I am completly rebuilding a 42 ft boat trailer that has been sitting in the weeds for 15 yrs. Everything I have got from etrailer has been the very best quality and the service and shipping is 2nd to none. As far as I'am concerned etrailer is the only place for trailer parts
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.
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