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Replacing Brake Assemblies on 44 Foot Enclosed Haulmark Gooseneck Trailer


Hello I am buying a 44ft enclosed haulmark gooseneck trailer.Originally it had electric brakes3 axles.Many years ago it was changed to vacuum assist hydraulic brakes.It is 1100 miles from me and has not moved in 10 years.I am trying to put together a plan to go get it and bring it home with least amount of trouble. The trailer will be empty so I am thinking about removing one whole axle and put it in the trailer,install 4 new tires and install 4 new electric units brakes on two axles and run wires to the plug.It has 7000 lb dexters.All of this is to just get it home AR to PA. I am looking for parts recommendations and ideas. I dont really want to spent 3 weeks and thousands rebuilding the current brake setupdont even know if it currently works and plumb my truck with vacuum lines and valves to work that far from home.


Expert Reply:

Converting back to electric brakes would be the easiest and most cost-effective way to go. In order to specify the correct parts, you'll need to have some things confirmed. Hopefully, the seller will help you out with verifying this.

A 7K axle will typically use a 12x2 inch brake drum with a 8-on-6-1/2 inch wheel bolt pattern. It would use a # 25580 inner and # 14125A outer bearing. If your existing drums are still serviceable, you could reuse them, but if they need replacement, you'd need to verify the wheel bearing reference numbers and wheel bolt pattern. If the hubs need replacement, I'd recommend # AKHD-865-7-2-K, once again you'll want to ensure that the wheel bearings match the existing hubs.

For an electric brake assembly, use # AKEBRK-7L-SA for the left side and # AKEBRK-7R-SA for the right side.

You'll also need to wire each brake assembly. Each assembly will have two wires, one wire grounds to the trailer frame, the other would connect to the brake output wire which would run to the trailer connector. If you need brake wire, we sell it by the foot as part # 10-1-1.

To actuate the brakes, you'll need to install a brake controller on the tow vehicle. For the safest and most predictable braking action, I'd recommend using a proportional controller like the Tekonsha Prodigy P2, part # 90885. Many later model trucks will have a brake controller wiring harness that allows the controller to plug in under the dash. If your truck doesn't offer that option, the controller can be hardwired using our brake controller install kit, part # ETBC7.

I wish I could specify exactly which parts you need, but I don't have a reference that would tell me exactly which parts were used on a old trailer like the 44 foot Haulmark you referenced.

expert reply by:
Michael L

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