Which Axle Should Electric Brakes be Installed on with Tandem Axle Trailer
Question:
If I order item number AKHD-5475-35-K will the bearings I get with the hub be the correct size or will I need to order the bearings, you mentioned, separately?
asked by: Brad
Helpful Expert Reply:
When installing electric brake assemblies on just one axle of a tandem axle trailer, you will essentially want to choose the axle that is going to be seeing more weight. Typically on utility trailers, most of the weight will be in front of the axles so the brake assemblies will be installed on the front axle. For boat trailers, where the motors are at the rear, you will usually see brakes on the rear axle.
I have attached a great article that details everything you will need to install electric brakes on your trailer, along with helpful installation tips. In order to determine exactly what parts you need, you will want to find the weight capacity for your axles, your mounting flange bolt pattern (if present) and the depth/diameter of your drums if you already have hub and drum assemblies.
If you just have idler hubs (and no drums), you will want to find the inner and outer bearing numbers on the hub. You can find these by pulling the hub and checking for the numbers that should be stamped onto the bearings themselves. If you cannot locate this information, you can also take a few measurements along the spindle where the bearings sit. I have attached an image that shows where these measurements will be taken. I recommend using a digital caliper like # PTW80157.
If you are able to tell me this information, I will be happy to make some recommendations for your trailer.
Products Referenced in This Question
Electric Trailer Brake Assembly - Self-Adjusting - 10" - Left Hand - 3,500 lbs
- Accessories and Parts
- Trailer Brakes
- Electric Drum Brakes
- LH
- 3500 lbs
- Brake Assembly
- Self Adjust
- 10 x 2-1/4 Inch Drum
- etrailer
more information >
Electric Trailer Brake Assembly - Self-Adjusting - 10" - Right Hand - 3,500 lbs
- Accessories and Parts
- Trailer Brakes
- Electric Drum Brakes
- RH
- 3500 lbs
- Brake Assembly
- Self Adjust
- 10 x 2-1/4 Inch Drum
- etrailer
more information >
Easy Grease Trailer Hub and Drum Assembly for 3.5K Axles - 10" - 5 on 4-3/4 - Pre-Greased
- Trailer Hubs and Drums
- Hub with Integrated Drum
- EZ Lube
- Pre-Greased
- L68149 / L44649
- Standard Grade
- For 3500 lbs Axles
- 1/2 Inch Stud
- 5 on 4-3/4 Inch
- 13 Inch Wheel
- 14 Inch Wheel
- 14-1/2 Inch Wheel
- 15 Inch Wheel
- etrailer
more information >
Hopkins 7-Way RV Style Connector with Molded Cable - Trailer End - 8' Long - RV Standard
- Trailer Wiring
- Trailer Connectors
- Trailer End Connector
- 6 - 10 Feet Long
- Plug and Lead
- 7 Round - Blade
- Hopkins
more information >
Replacement Trailer Hub Bearing - L44649
- Trailer Bearings Races Seals Caps
- Bearings
- Standard Bearings
- 1.063 Inch I.D.
- Bearing L44649
- Race L44610
- 3500 lbs Axle
- etrailer
more information >
Replacement Trailer Hub Bearing - L68149
- Trailer Bearings Races Seals Caps
- Bearings
- Standard Bearings
- 1.378 Inch I.D.
- Bearing L68149
- Race L68111
- 3500 lbs Axle
- etrailer
more information >
Product Page this Question was Asked From
4" Carbon Fiber Digital Caliper
- Hand Tools
- Measuring and Layout Tools
- Digital Calipers
- Carbon Fiber
- Performance Tool
more information >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Shop: Dexter Trailer Hub & Drum Assembly for 3,500-lb Axles - 10" Diameter - 5 on 4-1/2 - Pre-Greased
- Search Results: 7 pin trailer wiring harness
- Search Results: 7 pin
- Article: How to Measure Your Trailer Wheel Bolt Pattern
- Article: Parts Needed to Add Electric Drum Brakes to a Trailer
- Video: Complete Breakdown of the 4-Leaf Double-Eye Spring for 5,000-lb Trailer Axles
- Q&A: Proper Way to Tighten Trailer Spindle of Castle Nut
- Search Results: trailer leaf springs
- Search Results: ring terminals wiring
- Search Results: car ramps
- Search Results: 10 gauge wiring
- Search Results: 7 pin wiring
- Shop: Trailer Wiring Junction Box - 7 Color Coded Terminals - ABS
- Shop: 12 Gauge 2 Conductor Jacketed (Brake) Wire Per Foot
- Shop: 4-Leaf Double-Eye Spring for 5,000-lb Trailer Axles - 25-1/4" Long
- Shop: 4-Leaf Double-Eye Spring for 4,000-lb Trailer Axles - 26" Long
- Shop: Tandem-Axle Trailer Hanger Kit for Double-Eye Springs - 2-1/2" Front/Rear, 4-1/2" Center
- Shop: etrailer Electric Trailer Brakes - Self-Adjusting - 10" - Left/Right Hand Assemblies - 3.5K
- Q&A: How to Wire Electric Brakes on a Tandem Axle Trailer
- Q&A: When Do Brakes Need to be Added to Both Axles of Tandem Axle Trailer
- Article: How To Read A Tire Sidewall
- Video: Opti-Brite 12V/24V LED Dome Light for Refrigerated Trucks and Trailers Feature Review
- Q&A: How to Charge a Trailer Battery Through a 7-Way Connector
- Video: LED Dual Row Strobe Light Review
- Video: Complete Breakdown of the Optronics Fleet LED Trailer Tail Lights w/ Grommets
- Video: In-Depth Review of the Optronics Fleet LED Trailer Tail Lights w/ Grommets
- Video: Let’s Check Out the Fusion LED Hardwired Trailer Light
- Video: Feature Review Fusion LED Hardwired Trailer Light
- Q&A: Can 10 inch Brake Drums be Used with 13 inch Trailer Wheels
on Hand Tools
Brad
1/30/2018
This is for Chris R. Chris, this is Brad. I could not read the numbers off the bearings but I took the measurements based off the illustration you had. It is as follows: Measurement A: 1.7735 inches. B: 1.721 inches. C: 1.378 inches. D: 1.059 inches. I measured the mounting holes and adjacent holes are 3.2885 inches outside to outside. I would guess 3.25 center to center. My lug spacing is 5 on 4.75 Please let me know what I need to get me some breaks.