Adding Electric Drum Brakes To A Tandem Axle Trailer
Question:
I am looking to get some help in finding out if my trailer will allow for brakes without replacing the 3500 lb axles. The axles are paired with 15" wheels and have a 5 on 4-1/2 inch wheel bolt pattern. If there is someone there that can get in touch with me to help me figure out what parts I need, I would be very appreciative.
asked by: Andrew
Helpful Expert Reply:
Yes, I can point you in the right direction, and we carry a product that will serve as a solution for you. Since the trailer you're looking to modify has never had brakes installed on it before, and since you're running a trailer with tandem 3500 lb. axles and no existing actuator, the best product recommendation is an electric drum brake system that will work with your existing brake controller, without the need to add an actuator or hydraulic lines.
The Dexter # 23-468-469 brake assembly is a great product for your needs. It's a self-adjusting brake that will fit your 3500 lb axles and will work with your 15" wheels using the 5 on 4-1/2" bolt pattern. Since you have a tandem axle trailer, you'll need to purchase two kits, one for each axle.
You're also going to need a good hub and drum assembly that is designed to work alongside your new brakes, your existing wheels, and your existing axles. The Dexter # 84546UC3 hub and drum assembly will come with everything you need for this, but you'll need to buy four (4) so you've got one for each wheel, as they're sold individually.
It sounds like you want to try to maximize the life of those existing axles and not have to replace them. What I'd recommend most is to have a professional installer replace the flanges and spindles. This part of the process is not a DIY job, but you can obtain the parts you need from our site. To do this you'll need four (4) mounting flanges for each of the braking assemblies to be mounted to the axle, such as the the Brake Mounting Flange # 4-35, and four new spindles which will need to be welded on to the ends of the axle, such as the # TRU84FR, and it's critically important to use a professional installer who can use a jig to put these on perfectly.
I've attached two supplemental articles as well as several videos that will help as well.
Products Referenced in This Question
Brake Mounting Flange for 2-3/8" Round Axle
- Accessories and Parts
- Trailer Brakes
- Disc Brakes
- Electric Drum Brakes
- Hydraulic Drum Brakes
- Brake Mounting Flange
- 10 Inch
- 2-3/8 Inch Diameter Axle
- Redline
more information >
Dexter Trailer Hub and Drum Assembly for 3,500-lb Axles - 10" Diameter - 5 on 4-1/2
- Trailer Hubs and Drums
- Hub with Integrated Drum
- Standard
- L68149
- L44649
- For 3500 lbs Axles
- 5 on 4-1/2 Inch
- 13 Inch Wheel
- 14 Inch Wheel
- 14-1/2 Inch Wheel
- 15 Inch Wheel
- Dexter
more information >
#84 Spindle for 3,500-lb Trailer Axles - 1-3/4" Diameter
- Trailer Spindles
- Standard Spindle
- 1-3/4 Inch Diameter
- Round
- For 3500 lb Axle
- TruRyde
more information >
Product Page this Question was Asked From
Dexter Nev-R-Adjust Electric Trailer Brakes - 10" - Left/Right Hand Assemblies - 3.5K
- Trailer Brakes
- Electric Drum Brakes
- Standard Grade
- Self Adjust
- 10 x 2-1/4 Inch Drum
- 3500 lbs Axle
- 14 Inch Wheel
- 14-1/2 Inch Wheel
- 15 Inch Wheel
- Dexter
more information >
Continue Researching
- Article: Trailer Wiring Diagrams
- Article: Most Popular Wheel Bearings
- Article: Parts Needed to Add Electric Drum Brakes to a Trailer
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- Article: How to Adjust Your Trailer Brakes | The Ultimate Guide
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- Q&A: Comparing the eTrailer and Dexter Electric Trailer Brake Kits
- Article: Trailer Tire Sizing
- Q&A: How to Initially Adjust the Dexter Nev-R-Adjust Electric Trailer Brakes
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Q&A: Can Electric Brakes be Used on a Boat Trailer
- Q&A: Replacement Dexter Brake Assemblies for 36-19 Assemblies
- Q&A: How to Measure to Determine the Size Trailer Brakes Needed For Hydraulic Drum Replacement