Troubleshooting an Electric Over Hydraulic Actuator that Randomly Locked Trailer Brakes.

Question

Question:

I bought this pump from your on line store about 18 months ago. Its worked perfectly and Ive been very happy with it, until today. I returned from a short RV trip in which the brakes worked fine and when I disconnected my trailer and the 7-way connector chord, I noticed that the pump was still running, thus applying the brakes. The only way I could stop it was to disconnect the 12-volt power supply. Later, I reconnected the power, hooked the 7-way chord back up, and it seems to work fine. Obviously, this could be very dangerous. I checked all the obvious things, such as the fluid level, the voltage, all connections, etc. and all were fine. Any idea why this pump might run, even though disconnected from the truck? Thanks for your help.

asked by: Mark F

0

Expert Reply:

Check the connections of your breakaway system you have on your trailer. It sounds like the plug might be partially pulled or the power from the battery of that system has some how shorted out to the brake output circuit and is telling the actuator to lock up the brakes.

I attached a help article on breakaway systems for you to check out as well.

expert reply by: Jameson C

0

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Answer 1

The best option we carry for a 10,000 lb boat is the Fulton High-Performance 2-Speed Trailer Winch #F142430 which has a 3,700 lb capacity with Cable #FWC7500100. The winch to boat size capacity is 2-to-1 though it can also be 3-to-1 if you have…

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Answer 2

The integrated brake controller of your 2022 GMC Sierra 3500 has a hydraulic mode which would allow it to work with electric over hydraulic actuators without needing an adapter. With that said if for some reason the controller wasn't recognizing…

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Answer 3

The Titan BrakeRite II Severe-Duty Electric-Hydraulic Actuator Kit #T4835700 that you referenced does have some features to it that help make it install easier, but in reality when you are adding EOH brakes to a trailer there is quite a bit of…

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Answer 4

We do have a wiring diagram for you! Whether you have the 1,000 psi Dexter DX Series #K71-650 or the 1,600 psi Dexter DX Series #K71-651 the wiring will be the exact same. I have attached a wiring diagram and review videos for you to check out. Just…

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Answer 5

Like you said, many factory integrated brake controllers will not work well with electric over hydraulic trailer braking systems. Some of the newer versions of these controllers now have an electric over hydraulic mode. Check to see if any of your…

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Answer 6

It is not necessarily that the actuator is faulty, and it is more likely to be the brake controller. I recommend checking the the wiring, specifically the stop light switch wire to ensure it is not contacting another circuit that carries 12 volt…

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Answer 7

If your EOH brakes will not disengage the problem could either be mechanical, as in a malfunction with the master cylinder, a clog in the hydraulic lines or broken parts in the brake assemblies themselves. Or it could be electrical in origin, meaning…

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Answer 8

The "Trailer Disconnected" error message on the dash with a factory brake controller is usually related to an issue with the blue brake output wire that runs from the brake controller to the 7-Way connector. The fact that the issue remains…

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Answer 9

There are a few things that can cause the brakes to lock up on a trailer. First, disconnect the trailer from the vehicle. Then use a circuit tester like #PTW2979 if needed to test the connector on the vehicle. Have someone sit in the truck and run…

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Answer 10

I have attached a diagram that shows how the Dexter Electric Over Hydraulic Brake Actuator, part #K71-651 needs to be wired. You may want to check the wiring to make sure it is wired correctly and none of the wires show any signs of damage. Make sure…

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Answer 11

An often seen cause for the trailer brake controller to display a disconnect error message is a damaged or corroded connector on the trailer. This may have occurred during it's time at the shop or just didn't show up as a issue until after…

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Answer 12

It sounds like there was bleed-over from one of your trailer connector pins to your brake output pin. This can happen with just a little corrosion, so it doesn't surprise me that you unplugged the trailer and plugged it back in and the issue…

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Troubleshooting an Electric Over Hydraulic Actuator that Randomly Locked Trailer Brakes.

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