Mounting Bolt Pattern and Center Hole Diameter For Dexter Trailer Brake Assemblies 23-248 and 23-429

Updated 08/11/2026 | Published 08/10/2022

Products Featured in This Question

Dexter Electric Trailer Brake Assembly - 12-1/4" - Right Hand - 7,200 lbs

(13)

$300.95

Dexter Electric Trailer Brake Assembly - 12-1/4" - Left Hand - 7,200 lbs

(10)

$345.74

Dexter Electric Trailer Brakes - Parking Brake Ready - 12-1/4" - Left/Right Hand - 7.2K

(1727)

$643.88

Question:

What is the diameter of the center hole on the # 23-429, and 23-428 brake assembly? I am trying to replace my 23-369 and 23-370 brakes with a 9 hole mounting plates? Any information or ideas to repair or replace my brakes without replacing my axels would be greatly appreciated. Thank you

asked by: Joel F

Expert Reply:

The Dexter Electric Trailer Brake Assembly # 23-429 & # 23-428 have a center opening of 3-7/8" for fitting on the axle tube. It will mount to bolt holes that are 3-5/8" spread left to right and 4-3/8" top to bottom. I have included images below with both measurements to help you identify the fitment. We also have them as a Set # 23-428-429 since you will will being replacing them on multiple axles. If these will not fit your current axles please let me know your mounting pattern and the center hole diameter required.

expert reply by: Bud M

Mounting Bolt Pattern for Dexter Trailer Brake Assemblies # 23-428 and # 23-429
(click to enlarge)

Center Hole Diameter For Dexter Trailer Brake Assemblies # 23-428 and # 23-429
(click to enlarge)

Steve

8/11/2026

Are sure that 4-3/8 isn't supposed to be 3-3/8? Thanks

Jameson C.

8/11/2026

@Steve 4-3/8 inch would be correct. Do you need assemblies with same dimensions aside from that one?

Steve

8/11/2026

@JamesonC He was saying that the bolt pattern was 4-3/8 x 3-5/8 inches and the diagonal measurement was 5 inches. Can’t be. Draw it out on a piece of paper the diagonal is roughly 5-3/4. I’m just trying to make sure I order the right stuff.