How do I Correctly Measure Drum Brakes?
Updated 09/04/2025 | Published 04/21/2020
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Question:
I want to know what I need to measure to get the correct brake system for my trailer. Do I measure the inside width of the brake drum and the diameter of the drum? Thank you.
asked by: Aaron L
Expert Reply:
When measuring the brake drum, you measure the interior diameter on the drum.
I have attached a photo to help during the measuring process.
If your brakes are 7 inches part # AKEBRK-2 works for your application. You also need hardware part # BRKH7
If your brakes are 10 inches part # AKEBRK-35-SA works for your application. You also need hardware part # BRKH10B
If your brakes are 12 inches part # AKEBRK-7-SA works for your application. You also need hardware part # BRKH12
Product Page this Question was Asked From
etrailer Electric Trailer Brakes - 7" - Left/Right Hand Assemblies - 2,000 lbs
- Trailer Brakes
- Electric Drum Brakes
- Standard Grade
- Manual Adjust
- 7 x 1-1/4 Inch Drum
- 2000 lbs Axle
- 10 Inch Wheel
- 12 Inch Wheel
- 13 Inch Wheel
- etrailer
more information >
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Kenny
9/3/2025
Hello, I have a shorelandr pontoon bunk trailer, the drum measures 8.5 inches inside, I can not find anything like it, any ideas. I need to replace the complete backing plate, master cylinder and shoes.