Will the Additional Width from Slip-Over Rotors Affect the Fit of the Brake Calipers on a Trailer

Updated 02/09/2025 | Published 10/10/2013

Question:

I have 2x3 galv axles with idler hubs and want to convert to disc brakes. The dacromet rotors with ss calipers is my choice but I herd that 1/2 inch is added in width when adding the rotors. What happens then with the brake plate found on my axles? Will the pads and caliper alligne?

asked by: Allex

Helpful Expert Reply:

There is some additional width added when using the slip-over rotors like # K2R35DS. This is true on every application that uses this set up. The brackets and calipers are designed for this so they will line up just fine. The wheels and tires will just be 1/2 inch further out on each side.

You will need to make sure that your existing axles have brake mounting flanges in order to add brakes to the trailer. If you do not have a 4-bolt mounting flange on each end of the axle, # 4-35, you will need to have them welded on by a qualified professional with experiencing in adding brake mounting flanges. It is a precision job because the flanges have to be perfectly square and concentric.

I have included a link to an FAQ article that should also help you.

expert reply by: Michael H

Remaundo

2/9/2025

hi, if i send you a picture would you be able to tell me what i need far as the bracket, and so forth.

Robin H.

2/9/2025

@Remaundo if you can send me a picture of your axle tag, along with your bolt pattern, I can identify a kit that will fit assuming one is available. You can respond to the email that brought you back to this page with your pictures.