How do I Correctly Measure Drum Brakes?
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
![Clayton O](https://images.etrailer.com/static/images/catg/people/1832_tn.jpg)
Products Referenced in This Question
etrailer Electric Trailer Brakes - Self-Adjusting - 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
- etrailer
more information >
etrailer Electric Trailer Brakes - Self-Adjusting - 12" - Left/Right Hand - 5.2K to 7K
- Trailer Brakes
- Electric Drum Brakes
- Standard Grade
- Self Adjust
- 12 x 2 Inch Drum
- 5200 lbs Axle
- 6000 lbs Axle
- 7000 lbs Axle
- 14-1/2 Inch Wheel
- 15 Inch Wheel
- 16 Inch Wheel
- etrailer
more information >
Mounting Hardware for 10" Brake Assemblies
- Accessories and Parts
- Trailer Brakes
- Electric Drum Brakes
- Hydraulic Drum Brakes
- Hardware
- 10 Inch
- Redline
more information >
Mounting Bolts and Hardware for 12" Brake Assemblies
- Accessories and Parts
- Trailer Brakes
- Electric Drum Brakes
- Hydraulic Drum Brakes
- Hardware
- 12 Inch
- Bolts
- Redline
more information >
Mounting Hardware for 7" Brake Assemblies
- Accessories and Parts
- Trailer Brakes
- Electric Drum Brakes
- Hydraulic Drum Brakes
- Hardware
- 7 Inch
- Redline
more information >
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 >
Featured Help Information
Miscellaneous Media
Continue Researching
- Video: Review of etrailer Trailer Hubs and Drums - Hub with Integrated Drum - AKHD-865-7-1-K
- Shop: Dexter Nev-R-Adjust Electric Trailer Brakes - 10" - Left/Right Hand Assemblies - 3.5K
- Q&A: What is the Proper Torque Range for Trailer Wheels
- Q&A: How to Measure Brake Drums
- Search Results: electric drum brakes
- Search Results: brake controler
- Shop: Replacement U-Bolt with Nuts for 2-3/8" Round Trailer Axles - 1/2" Diameter
- Shop: U-Bolt Kit for Mounting 5,200-lb to 7,000-lb, Round Trailer Axles - 7" Long U-Bolts
- Shop: Replacement U-Bolt w/Nuts for 7,500-lb, Round Trailer Axles - 9/16" Diameter
- Shop: 2-3/8" Round Trailer U-Bolts (Qty 2)
- Shop: Replacement U-Bolt for 2-3/8" Round Axle - 5-1/8" Long - 7/16" Diameter - Qty 1
- Shop: 7-Way RV Upgrade Kit for Trailer Brake Controller Installation - 12 Gauge Wires
- Search Results: safety chains
- Search Results: measure brake drum
- Video: Review of etrailer Trailer Fenders - Slant Back Single Axle Fender - HP48VR
- Video: Dutton-Lainson Safety Chains and Cables - Safety Cables - DL20119 Review
- Search Results: bunk boards
- Video: Dexter Axle Trailer Brakes - Hydraulic Drum Brakes - 23-324-325 Review
- Video: Review of CE Smith Boat Trailer Parts - Roller and Bunk Parts - CE27845
- Video: etrailer Trailer Brakes - Hydraulic Drum Brakes - AKFBBRK-7-D Review
- Video: CE Smith Boat Trailer Carpeted Bunk Boards Review and Installation
- Search Results: safety cables
- Search Results: marine grade carpet
- Q&A: Replacement Trailer Grease Seals for Allis 5013 29772
- Q&A: Kit to Convert 2021 Vanleigh Pinecrest 335RLP to Electric Over Hydraulic Disc Brakes
- Article: Wiring Trailer Lights with a 4-Way Plug (It's Easier Than You Think)
- Q&A: Can Electric Trailer Brake Kit # AKEBRK-2 be Submerged in Water
- Article: Parts Needed to Add Electric Drum Brakes to a Trailer
- Q&A: Replacement Fan Recommendation for the MaxxAir 4700K
- Q&A: Will the Draw-Tite Trailer Hitch Fit a 2022 Volvo XC90 Recharge