Selecting the Correct Hydrastar EOH Actuator When Converting Triple Axle Surge Disc Brakes

Question

Question:

Looking at swapping my surge trailer brakes to Hydrastar electric-hydraulic. I noticed they come in a range 1000 to 1600 psi. What dictates the correct pressure? My trailer is tri axle, Disc brake on all 3 and load is approx. 10K.

asked by: Shawn W

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Expert Reply:

As you are converting your surge trailer with disc brakes you will want to go with the Hydrastar Marine Electric Over Hydraulic Actuator w/ Breakaway and 7-Way RV Harness # HS381-9067. This kit will include the junction box to run your wiring, a breakaway kit and the correct actuator.

The 1,000psi Hydrastar # HBA-10 is for single or tandem axle trailers up to 7,000lbs GVWR with drum brakes. The 1,200psi Hydrastar # HBA-12 is for trailers using drum brakes over 8,000lbs GVWR with up to 3 axles. And the 1,600psi Hydrastar # HBA16 is for trailers with disc brakes and up to 3 axles.

If you can provide me with some additional details on your trailer I can help you find the correct replacement Coupler # DM16080-95 as it is not recommended to continue using the surge coupler. You will also want to be sure any trailer brake controller you use is compatible with electric over hydraulic brakes. If you are using a factory installed brake controller you will most likely need a Hydrastar Electric Over Hydraulic Actuator Adapter Module # HBA-CAM for your controller to function properly.

expert reply by: Bud M

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Answer 1

For your boat trailer with the tandem 3,500lb axles you will need two of the Kodiak Disc Brake Kits #K2HR35DS and two Bearing Kits #DBRKHW35EZ. These will replace the surge drum brake hubs you currently have with Dacromet and Stainless components…

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Answer 2

The correct replacement for a Demco Master Cylinder 05680-C is the Replacement Master Cylinder part #5650. I spoke with Demco to confirm this for you.

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Answer 3

Brake systems are not dependent on the hub bolt pattern. So you can use the Electric Trailer Brake Kit #AKEBRK-7-SA for 12 inch hub/drums or #AKEBRK-35-SA for 10 inch hub/drums. Then use #10-1-1 wire sold by the foot for your brake magnet wiring.…

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Answer 4

Since you have a wheelbase/axle spacing of 38 inches the correct hanger kit for slipper springs would be the part #HAP-105-205-01. And then for a 7k trailer axle the u-bolt kit you'd want would be the part #APUBR-8. I attached the diagram to use…

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Answer 5

The old version of the #HBA-CAM used 4 wires, but the product was updated awhile back and now uses only two wires as shown in the photo on the product description page. The white wire from the HBA-CAM would tap into the white ground wire and the blue…

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Answer 6

The Tekonsha OEM Vehicle Wiring Harness #22121 that you referenced includes all the wiring and parts necessary to install a fully functional 7-Way connector and trailer brake controller. The included brake controller harness is compatible with and…

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Answer 7

For the LCI52-SB-86.5-68.5, the two ending measurements are: 1st - measurement from hub to hub, meaning the length of the axle in this case is 86.5 inches. 2nd - spring seat dimension where they're welded, meaning the spring seats are 68.5 inches…

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Answer 8

To determine the size of the brake assemblies you need you have to measure the depth and width of the hub drum on the axle like what you see in the picture I attached. The most common size is 2-1/4 inch wide like the #T4071600-500 that you…

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Answer 9

We do have a compatible grease seal for your 168255TC oil seal, however, we do not carry rubber coated seals in this size. The 168255TC oil seal was designed to work with oil bath hubs on a 3,500 lb axle. For the most part, axle manufacturers have…

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Answer 10

If the trailer wheels scrubbed (dragged and scrapped the ground instead of rolling) when jack knifed then it could have thrown something out of alignment or damaged something. First, inspect the suspension. Look for any elongated holes where…

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Answer 11

You do not want to use a holding tank heater like ThermaHeat #277-000164 on a battery but we do offer battery heaters specifically intended to protect one from extreme cold. You can see all such items on the page I linked for you. You'll want to…

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Answer 12

From the looks of the photo you sent it does not look like you have an OEM suspension system on your boat trailer. I recommend securing the suspension rail to the trailer frame in a more secure manner like drilling and using bolts so that it does not…

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