How to Find Replacement Electric Drum Brakes for a Trailer
Updated 07/17/2020 | Published 10/24/2018
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Question:
Electric drum brakes how is the best way to measure to put brakes on a boat trailer that I cannot identify the axle
asked by: David
Expert Reply:
If you need to find the size of the correct replacement braking assembly for your boat trailer you will need to remove the trailer hub and measure the inside contact patch with the shoes which you can see in the attached photo. You will also want to make note of how many bolts hold the braking assembly to the axle. The most common two are the Electric Trailer Brake Kit part # AKEBRK-35 for 3,500 lb axles with a four bolt brake mounting flange or the Electric Trailer Brake Kit part # AKEBRK-6 for 5,200 - 7,000 lb axles with a five bolt brake mounting flange.
If you do not have access to the drum then the only options I have are to either first count the number of brake mounting flange bolts and then measure the axle diameter or call the trailer manufacturer with your VIN. If you have to measure the axle diameter you can use the below chart to determine weight capacity but please keep in mind this only works for leaf spring axles. I have attached a list of our braking assemblies for you as well.
- 1,000-lb - 2,000-lb Axles: 1-1/2 inch - 1-3/4 inch diameter
- 3,500-lb Axles: 2-3/8 inch diameter
- 6,000-lb - 7,200-lb Axles: 3 inch diameter
- 8,000-lb Axles: 3-1/2 inch diameter
- 9,000-lb Axles: 4 inch diameter
- 10,000-lb + Axles: 5 inch diameter
Product Page this Question was Asked From
etrailer Electric Trailer Brakes - 10" - Left/Right Hand Assemblies - 3,500 lbs
- Trailer Brakes
- Electric Drum Brakes
- Standard Grade
- Manual Adjust
- 10 x 2-1/4 Inch Drum
- 3500 lbs Axle
- 14 Inch Wheel
- 14-1/2 Inch Wheel
- 15 Inch Wheel
- etrailer
more information >
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George W.
7/13/2020
I have 10" electric brakes and I have manual adjustment can I order self adjusting