Are 10 Inch Electric Brake Dimensions Referring to Inside of Drum

Question:

I have an older trailer I need to replace the electric brakes first question the first dimension you give 10,12,etc is to be the drum size but is that the inside dim or the outside dim? The outside dim of the drums I have are approx. 10.5 so the inside is slightly smaller that 10- also I would like to replace the drums also but the hole pattern I have is 4 .25 do have any like this I did not come across any in your site. Thanks for your time

asked by: Rodney P

Helpful Expert Reply:

The measurement that is being referred to in regards to the size of electric brakes is the inside diameter of the drum. So for example, the Electric Trailer Brake Kit - 10" # AKEBRK-35-SA measure 10" diameter x 2-1/4" wide so that's the size of the drum they would fit.

These will work on that size drum, fit a 4-bolt mounting flange like part # 4-35 and are rated for 3,500 lbs. The Mounting Hardware # BRKH10B is also needed for the Electric Trailer Brake Kit # AKEBRK-35-SA.

In regards to replacing the hub and drum, there are none with the bolt pattern you mentioned, so you may need to replace your wheels as well. I'm not sure which hub and drum you are needing so I have added a link below to our entire selection for you, as well as a link to our selection of wheels should you also need those.

expert reply by: Kyle S