Conversion of Air Over Hydraulic to Electric Over Hydraulic Brakes

Question

Question:

How does the actuator connect to the trailer master cylinder reservoir? Right now the trailer air tank lines go directly to the master cylinder. I just purchased two gooseneck trailers currently equipped with air over hydraulic. I have a 1-ton Ram diesel with integrated electric brake controller. And what items do i need to make the conversion?

asked by: Larry C

0

Expert Reply:

Thanks for including a picture!

Actually, the electric over hydraulic actuators have their own reservoir as the brake line connects directly to the unit.

The integrated brake controller you have isn't compatible with electric over hydraulic because it won't activate the actuator properly. If you provide me the year of your Ram, I will be more than happy to recommend a brake controller. However, one of our most popular brake controllers is the Tekonsha Prodigy P2 # 90885. It includes a digital display, 3 boost levels, battery protection and continuous diagnostics.

The Dexter Electric/Hydraulic Brake Actuator for drum brakes I recommend is the Dexter # K71-650. It's 1,000 psi for drum brake applications. You will need a breakaway kit like # 34-285 in the event you don't have one.

For disc brakes, I recommend the Dexter # K71-651. It's 1,600 psi suitable for disc brake applications. Breakaway kit is also # 34-285.

Another option to consider, and is less costly, is switching to electric brakes and keep your integrated brake controller. To switch your hub and drum assemblies I would need to know the bolt pattern of the trailer wheel, brake mounting flange mounting pattern, wheel size, and inner and outer bearing numbers.

The numbers stamped into your trailer's existing bearings and seals will help you determine the proper hub-and-drum assemblies. You will also need to know the wheel bolt pattern of your existing hubs so that the new hubs will match up with your existing wheels. If you cannot find part numbers for the bearings and seals, you can measure the spindles at the inner (C in diagram) and outer (D in diagram) bearing surfaces as well as the seal contact surfaces (B in diagram). See diagram to the right.

The pattern of the holes in the brake flange is standard, so all you need to note is the number of holes in the mounting flange, and the axle diameter.

I have included a few FAQ's and video review for you as well.

expert reply by: Chris B

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click to enlarge

Answer 1

I have another option for you, but no you cannot use the Dexter DX EOH Actuator For Disc Brakes #K71-651 with hydraulic drum brakes. This is due to the pressure differences in the actuators as they were designed for the different styles of brakes.…

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Answer 2

I have a soluton for you, but the Dexter EOH Actuator #K71-651 is designed for disc brakes and the pressure generated for those would damage the components of drum brakes. Instead I recommend using the Dexter #K71-650 which has 1000 psi and is…

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Answer 3

The overall height of the bracket of the Buyers Products Pintle Loop and Channel part #337B20143 is 7-5/8 inches. The overall width is 4 inches.

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Answer 4

The inner diameter of the expanded ends of the part #CAM44812 is 1.53 inches and the outer diameter of the non expanded end is 1.51 inches. So basically this setup is designed to either slip into a 1-1/2 inch pipe or slip over a 1-1/2 inch pipe.

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Answer 5

Since the braking power is still hydraulic, you should have no issues converting from a vacuum over hydraulic system to an electric over hydraulic system. The electric over hydraulic actuator will take the place of the vacuum that pressurized the…

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Answer 6

I would start by checking the condition and level of the brake fluid. I typically recommend flushing and replacing the brake fluid on these types of units every year no matter how much the trailers are used. Brake fluid can absorb moisture which will…

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Answer 7

The Dexter DX Series Electric Over Hydraulic Brake Actuator for Disc Brakes #K71-651 has 4 wires. Blue - Brake Controller Output Black - 12 Volt Positive White - 12 Volt Ground Yellow - Breakaway Switch The ActiBrake system you are replacing uses 5…

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Answer 8

First thing you will need to do is check that all of the wiring of the actuator and your brake controller are correct. I attached a couple diagrams that should be helpful I spoke with my contact at Dexter and there is a way to troubleshoot your…

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Answer 9

I checked with Dexter and there are quite a few different possibilities of what the issue could be for the Dexter DX Series Electric Over Hydraulic Brake Actuator for Drum Brakes #K71-650 not running. You said all the wiring looks good, but it is…

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Answer 10

When it comes to the wiring for the Dexter Electric Over Hydraulic Brake Actuator, #K71-651: 1. The black wire will connect to the 12V circuit coming from the vehicle's trailer wiring that is always hot. 2. White is the ground. 3. The yellow wire…

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Answer 11

I spoke with my contact at Tekonsha, who is doubtful the controller is the issue. The voltage from the controlleer that's sent to the actuator is very minimal, it's just telling the actuator when and how hard to fire. The actuator is actually…

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Conversion of Air Over Hydraulic to Electric Over Hydraulic Brakes

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