Troubleshooting EOH Actuator That Will Not Release Brakes

Question

Question:

My electric over hydraulic brakes will not release what could cause the problem

asked by: Eric

0

Expert Reply:

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 that electrical power is reaching the actuator when it should not.

Troubleshooting this type of problem is easiest if you disconnect the trailer and test the tow vehicle and trailer separately.

If the brakes release when you unplug the trailer then this suggests that the problem is on the vehicle side. This issue could be a bad brake controller or a short in the vehicle's wiring that is allowing 12V power from another circuit to leak into the brake circuit. A badly corroded connector could cause this and so could damaged wire. Check the socket on the vehicle and the wiring upstream of it for any signs of corrosion on the contacts or damage to the actual wiring.

If the brakes remain engaged even when the trailer is disconnected then this issue could be caused by power from the breakaway battery or the auxiliary battery reaching the brake circuit. If you can, disconnect all trailer-mounted batteries to remove any chance for power to reach the actuator. If the brakes remain engaged in this circumstance then this suggests a mechanical problem on the trailer.

If you have a circuit tester like # PTW2992 you can test the vehicle socket. Ground the tester and apply it to the contact for the brake circuit, shown in the linked photo. If you detect brake signal here without activating the controller then the controller is likely to be damaged.

Please try these tests and if they do not reveal the cause for the problem please tell me and we can try additional steps.

expert reply by: Adam R

0

Answer 1

Your existing Atwood model 83010 Brake Actuator (which as you mentioned is no longer available) is an 8,000 pound rated assembly for hydraulic drum brakes that's compatible with a 2" ball. It's designed to fit 3" wide straight…

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Answer 2

The Titan 60ZX7000 brake actuator is a Model 60 actuator, and you do have the correct part for a replacement master cylinder: - Replacement Master Cylinder Assembly for Titan Model 60 and Aero 7500 Brake Actuators - Drum #T4395100 So this will work…

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Answer 3

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 4

I went out to our warehouse for you and measured the Replacement Strike Plate for Bauer Products RV Door Locks part #BA29VR as this was not information the manufacturer offered. The opening is 2-1/16" tall x 11/16" wide. I have attached a…

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Answer 5

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…

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Answer 6

Hey Dan, thanks for reaching out. We do have the 7" electric brakes and drums. Electric brakes are typically less expensive and easier to service than disc brakes. Both could work but for a pop-up camper electric drum brakes would do fine and be…

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Answer 7

Hi Ben; the difference in the drum size won't make a difference as long as you have a #84 spindle with #L68149 inner and #L44649 outer bearings. The #AKHD-545-35-EZ-K is 10" x 2-1/2" while the #84546UC3-EZ is 10" x 2-1/4" and…

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Answer 8

No, I do not Paul and I doubt Curt or Draw-Tite make anything other than a 4-way for the hybrid model. Aftermarket wiring harnesses for vans are typically limited to 4-way connectors like the item #C63RV for LED lights or the item #C32MJ for…

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Answer 9

Not to worry because you can use breakaway kit #34-285 with regular electric brakes too. I called Dexter and they confirmed this. So you are good to go you would just omit the electric over hydraulic actuator part of the diagram for installation.

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Answer 10

Hi Ian! Disc brakes will need to have at least 1,600 psi from the actuator (drums are 1,000 to 1,200), so you will want to make sure whatever you go with is rated for that. With that said, I recommend the Hydrastar Marine Electric Over Hydraulic…

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Answer 11

While the #L68149 most likely corresponds to the inner bearing number of your hubs. If this is the case, you have either a 3.5k or a 4.4k axle. In order to know absolutely sure, you need to know the corresponding outer bearing number or the inner and…

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Answer 12

A Dexter 2,500 lb axle uses hubs that have inner and outer bearings of L44649 like the part #8-257-5UC3 which has a 5 lug bolt pattern or the #8-173-16UC3-EZ which has a 4 lug bolt pattern. These both come with bearings and seals as well. For brake…

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Troubleshooting EOH Actuator That Will Not Release Brakes

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