1. Trailer Brakes
  2. Demco
  3. Hydraulic Drum Brakes
  4. 7000 lbs Axle
  5. 12 x 2 Inch Drum
  6. 14-1/2 Inch Wheel
  7. 15 Inch Wheel
  8. 16 Inch Wheel
Demco Hydraulic Brake Kit - Free Backing - Galvanized - 12" - Left/Right Hand Assemblies - 7K

Demco Hydraulic Brake Kit - Free Backing - Galvanized - 12" - Left/Right Hand Assemblies - 7K

Item # 42029-28
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Retail:$176.20
Our Price: $163.02
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Trailer Brakes
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Shipping Weight: 30 lbs
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42029-28 - 7000 lbs Axle Demco Hydraulic Drum Brakes
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Free-backing, driver's-side and passenger's-side brakes won't engage when you reverse, even if your actuator is activated. Galvanized steel resists rust, making the assemblies great for boat trailers. Fit 14.5" to 16" wheels. Lowest Prices for the best trailer brakes from Demco. Demco Hydraulic Brake Kit - Free Backing - Galvanized - 12" - Left/Right Hand Assemblies - 7K part number 42029-28 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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  • Reviews (7)
  • Q & A (0)
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Demco Trailer Brakes - 42029-28

  • Hydraulic Drum Brakes
  • 7000 lbs Axle
  • 12 x 2 Inch Drum
  • 14-1/2 Inch Wheel
  • 15 Inch Wheel
  • 16 Inch Wheel
  • Demco
  • Free Backing
  • Brake Set

Free-backing, driver's-side and passenger's-side brakes won't engage when you reverse, even if your actuator is activated. Galvanized steel resists rust, making the assemblies great for boat trailers. Fit 14.5" to 16" wheels.


Features:

  • Marine-grade hydraulic drum brake assemblies are great for boat trailers
    • Designed for use with surge-type trailer brake actuators
  • Sturdy, corrosion-resistant steel construction
    • Galvanized backing plates
    • Stainless steel spring hardware
    • Zinc-plated wheel cylinders
  • Free-backing design lets you back up without engaging the trailer brakes, even if the actuator is activated
    • Riveted, fall-away brake shoes only anchor on drums when brakes are engaged as trailer is moving forward
  • Periodic manual adjustment required
  • Adjuster plugs (included) cover access holes to keep dirt and grime out of the assemblies and off of the shoes
  • Left-hand (driver's-side) brake assembly and right-hand (passenger's-side) brake assembly included
    • Mounting bolts and hardware sold separately


Specs:

  • Dimensions: 12" diameter x 2" wide
  • Mounting flange bolt pattern: 5 bolt
  • 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 Brakes with Fall-Away Shoes

Each of these Demco free-backing brake assemblies 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, each 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.



SB42029M Demco Galvanized 12" Marine Trailer Brake Assembly - Freebacking - Left Hand

SB42028M Demco Galvanized 12" Marine Trailer Brake Assembly - Freebacking - RightHand






Customer Reviews

Demco Hydraulic Brake Kit - Free Backing - Galvanized - 12" - Left/Right Hand Assemblies - 7K - 42029-28

Average Customer Rating:  4.9 out of 5 stars   (7 Customer Reviews)

Free-backing, driver's-side and passenger's-side brakes won't engage when you reverse, even if your actuator is activated. Galvanized steel resists rust, making the assemblies great for boat trailers. Fit 14.5" to 16" wheels.

- 42029-28
by:

I contacted your company to discuss replacing the discontinued brakes on my Trailmaster boat trailer and your Tech person was knowledgeable and accurate with his suggestions. Your website was great, and the videos you have available are perfect. I ordered that day, and I have never had better delivery. The Brake Kits I ordered look fantastic, and they installed very easy with no issues. Excellent product and Great informed people, I'll be back. Thank You. Keep up the great work. 558145


Comments
Excellent, Nice job, great business.
Timothy - 08/25/2019

60403

- 42029-28
by:

excellent, high quality 869308



- 42029-28
by:

Great service. Great prices. Timely responses via email and phone. Order was backordered by manufacturer and i was provided the appropriate alternative. Will be using e-trailer in the future. 795918



- 42029-28
by:

High quality parts sold at an excellent price. Highly recommend etrailer. 682399



- 42029-28
by:

Excellent quality and fit. 639731



- 42029-28
by:

Great fit. My 7000 lb boat has brakes a gain 637625



- 42029-28
by:

Older boat trailer had a wheel cylinder fail and fluid everywhere. These were easy to bolt on and a perfect replacement for what I had. This was not my first order from etrailer and I would recommend to anyone! Extremely fast shipping even when I just chose the regular, free method. 564521


Comments
No issues at all!
John - 09/13/2019

61084
7
7



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Info for this part was:

Edited by:
Lindsey S
Written by:
Alexander C

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