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Can Existing Brake Lines Be Used When Changing Surge Brakes To EOH Brakes On Boat Trailer

Question:

I have a triple axle boat trailer that currently has surge drum brakes on 2 axles and I would like to convert to disc EOH. My tow vehicle already has a brake controller that I use for my car hauler. With the conversion kit do I still use my existing master cylinder and hydraulic lines that feed the existing drum wheel cylinders? The reason Im asking is because the brake lines are inside the trailer tubing structure and would like not to have to fish new lines through the tube frame. Should I measure the spindle OD to get the proper bearing size? Any info you can send me would be appreciated. Im looking forward to making the conversion. Thanks,

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Helpful Expert Reply:

The Titan Disc Brake Kit, part # T4843800 you referenced is designed for 3,500 lb tandem axles, and includes the brake lines. I would love to tell you that you will not have to replace any of the brake lines but you will not know if the brake lines you currently have installed will have the same fittings needed for the # T4843800. If they have the same threaded fittings then you should be good to go. The master cylinder you have currently will not be used. everything is in the brake actuator with this kit.

There have been cases when installing a new brake system, the brakes do not react as well as you had hoped for due to the length of the trailer. If that is the case, you may need to install larger brake lines and that would certainly mean changing the lines you currently have, along with new fittings.

You will need to measure the spindle you have on your trailer with a precision instrument like a digital caliper. That way you will know before you make the purchase. Since the bearings, races, and seals are included with this kit you can check the dimensions of your spindle to make sure these will work. I have attached a photo of a spindle with the areas that need to be measured noted.

Another item to consider is your coupler. If your surge coupler can be locked out you should be okay with the new braking system. If it cannot be locked out, you may want to measure the trailer frame it attaches to and let me know and I will be happy to make some recommendations that will work for you.

As far as the brake controller, you need to make sure the brake controller you currently have is compatible with an EOH system. If you find it is not compatible, I recommend the Tekonsha Prodigy P3 Brake controller, part # 90195. If you let me know the year, make, and model of the towing vehicle, we may have a brake controller harness for your vehicle.

I have attached some helpful articles you can check out.

click to enlarge
helpful expert reply by:
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Jeffrey L

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