Converting Three 7,000 Pound Dexter Axles to Electric Over Hydraulic Brakes

Question:

What do I need as a complete Kit to convert my Triple 7K axle trailer to Electric over Hydraulic with Disc brake system? Sometime my loads have been 27,000 pounds on this trailer I want to be safe. Please advise

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Expert Reply:

I can certainly help you out with a disc brake set up on your trailer. The first thing we need to find out in order to select the correct parts would be the inner and outer bearing numbers stamped into the sides of the bearings in the hubs you have now. With that information I can ensure that we get you the right parts.

I would also need to know the bolt pattern of the wheels and what kind of braking system the trailer currently has. Also, do all 3 of the axles have brake mounting flanges? If so then you wouldn't need to add any flanges. But if any of the axles do not have flanges and you want brakes on all 3 axles then flanges will have to be welded on by a qualified installer since it is a precision job.

Once I have the information described above I can make some recommendations. In the meantime take a look at the help article I have linked below that covers parts needed for electric over hydraulic disc brakes.

expert reply by:
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Michael H

Question:

they have 1/2 inch lugs.

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Expert Reply:

Since you have Dexter axles and 1/2 inch studs you have some options for disc brake kits. If you want to stick with the Dexter brand you can use # K71-694-695-10 if your current hubs use grease or # K71-694-695-11 if they are oil bath hubs. You would need one kit per axle.

If you would rather go with a different brand then we have several other options from Kodiak.

Dacromet and stainless steel set # K2HR712DS will be the most corrosion resistant
Dacromet only set # K2HR712D will be a little less corrosion resistant
E-Coat set # K2HR712E, which is one step up from raw steel, is a fairly standard set
And if corrosion is not a concern at all we have raw finish set # K2HR712

All of these kits are designed for regular grease applications. The Kodiak kits do not come with bearings so you would also need one bearing kit # BK3-200 per hub for the Kodiak options.

Next you will need a brake line kit. Since your triple axle trailer is likely on the longer side I recommend the Hydrastar kit # HS496-253 with a 30 foot main line. We do have other options and I have included a link to them for you.

For the actual electric over hydraulic actuator the Hydrastar # HBA16 is very popular but there is a Dexter option as well, # K71-651, if you want to keep all of the parts the same brand. And for a breakaway kit you can use # 50-85-313 which also includes a built-in battery charger.

And last but not least the brake controller you use needs to be compatible with electric over hydraulic braking systems. Not all of them are. There are some factory integrated controllers that have an electric over hydraulic mode so if you have one of those be sure to use the proper mode. If you have an aftermarket controller let me know what it is and I can see if it is compatible.

If you do not have a brake controller I recommend the P2 # 90885 or the P3 # 90195. Both have electric over hydraulic modes. To determine if the controller has to be hardwired in or if there is a plug and play harness I would just need to know the year, make and model of the truck.

expert reply by:
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Michael H

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