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

For a general-purpose safety chain for a standard gooseneck trailer we offer #337BSC3842 from Buyers Products. This is a 42-inch chain with 3/8-inch clevis. The chain is rated for 15,000 pounds. This is sold as a single chain, not a pair. The 36-inch…

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Answer 2

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 3

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 4

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 5

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 6

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 7

According to Blue Ox, it'll take an experienced installer about 4 to 5 hours to complete the installation of their #BX1128 Base Plate Kit on a 2016 Jeep Grand Cherokee. The install isn't what I'd call super-difficult, but the installation…

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Answer 8

It sounds like you are speaking of the wires for the brake magnets. If this is correct, you will need to connect one of the wires to the brake controller output wire on your trailer connector and the other wire will need to be grounded to a clean…

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Answer 9

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 10

Hi Paul, you’re definitely on the right track here, and I can help you narrow this down with confidence. With your tandem 3,500 lb Dexter axles and 33 inch spacing, both the Dexter EZ Flex part #K71-652-00 and the Lippert Road Armor part #LC53CK are…

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Answer 11

The Demco Hydraulic Trailer Brake Actuator part #DM72VR should be a direct replacement for the Atwood 61101 Brake Actuator that you have now. This newest updated it rated at 7K instead of 6K. This is a bolt on option that mounts on 3" centers.…

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Answer 12

The #84 spindle is just a common way to identify the spindle dimensions typically used for 3,500 lb axles. So instead of listing out the parts, people can just say they have #84 spindles and it's easier to know what fits it. The CE Smith Trailer…

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Conversion of Air Over Hydraulic to Electric Over Hydraulic Brakes

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