Adding Disc brakes To A Fifth Wheel With 7K Axles With 6 on 5-1/2" Bolt Pattern

Updated 10/10/2023 | Published 10/09/2023

Products Featured in This Question

Hydrastar Disc Brake Kit w/ Actuator for Tandem Axle Trailers - 13" Hub/Rotor - 8 on 6-1/2 - 7K

(60)

$2153.59

Replacement Trailer Hub Bearing - 14125A

(136)

$15.94

Replacement Trailer Hub Bearing - 25580

(2074)

$21.85

Trailer Hub Grease Cap, 2.72" OD Drive In - Qty 2

(109)

$17.80

Question:

Hello there. soon I plan on upgrading my 5th wheel suspension and would like to add disc brakes. It has tandem 7k axles with 6 x 5 1/2 lugs. Do you have a disc brake kit that would work or do I have to change to an 8 lug? Any help would be much appreciated. Thank you!

asked by: Shane

Helpful Expert Reply:

We do recommend switching over to an 8 on 6-1/2" bolt pattern when adding disc brakes to a 7K axle. All of the 6 lug disc brake kits are going to be rated for 6K and under.

For a full disc brake conversion I recommend the Hydrastar Conversion Kit # HSE7K-T1. This is a complete kit, so you get everything you will need to convert your 7K electric brake axles over to disc. This uses the # 25580 and # 14125A bearings which are basically standard for 7K axles. The only thing you will need to purchase separately are the grease caps # RG04-100.

You will also need a brake controller that is compatible with electric-over-hydraulic brakes, if you do not have one already.

expert reply by: Jesse M