How to Measure Brake Drums

Published 12/08/2021

Question:

I have 40 year old drum brakes now That are electric. Is there a measurement I can take on the drum to know if these brakes will fit the existing drums? Thanks

asked by: Mark D

Expert Reply:

Yes, there is a measurement you can take to determine what size brakes you need and if they will fit your existing drums. You will want to measure the diameter of your drums. I have included a diagram detailing the dimensions you will need to find.

If you have 10 x 2-1/4 Inch drums then the etrailer Hydraulic Trailer Brake Kit - Uni-Servo - Free Backing - 10" - Left/Right Hand - 3,500 lbs item # AKFBBRK-35 you were looking at would fit your trailer.

expert reply by: Jerred H