Replacement Disc Brake Surge Coupler for 2004 Nitro Boat Trailer

Question

Question:

I’m not sure what replacement part to buy for my 2004 nitro boat trailer. The actuator and brake system is bad. The ball is 2” and it weighs less than 6,000 lbs. Thanks!

asked by: Brady

0

Expert Reply:

We can help you with a new surge brake coupler for your straight-tongue boat trailer. Your photo shows a label indicating the old coupler is designed for disc brakes which will use a coupler with higher pressure than a coupler for drum brakes.

For a 7K disc brake coupler you can use Demco part # DM62VR which includes an electric lockout feature. It fits a 3-inch wide channel tongue and uses 1/2 x 4-1/2 Grade-5 bolts for mounting.

expert reply by: Adam R

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Answer 1

Surge brakes do not have any adjustability. If you want to use them on steep hills your solutions would be best. Or you can look into an electric over hydraulic setup which will allow you to use a brake controller to activate the brakes. This gives…

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Answer 2

The top bolts are 3 inches apart on center, and the bottom bolt is 2 inches underneath those (and directly in the middle of the top bolts) for the 7,000 lb Demco Hydraulic Brake Actuator w/ Electric Lockout - Disc Brakes #DM62VR. You'll need…

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Answer 3

Some people have had luck punching out or removing the check valve in their drum brake actuator master cylinders to allow them to be used with the higher PSI requirements of disc brakes but the manufacturers of the actuators will not endorse this so…

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Answer 4

We don't offer an 8500 lb rated surge coupler, but we might have options that would work for you. If the GVWR (weight of trailer plug boat) is 8000 lbs or less, I'd recommend the Demco item #DM8669113 if your trailer has disc brakes or item…

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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

Hey Richard, thanks for reaching out! The Dexter DX7.5 Drop-N-Go Brake Actuator #099-175-00 is a great option for a replacement actuator because it's a direct replacement for the common Model 60 actuators that were popular in the '90s.…

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Answer 7

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 8

The manual lockout on your Atwood 85778 surge brake coupler is there so that you can back up the trailer without the brakes locking up on you. Yes you can safely tow your trailer with the broken manual lockout, you just have to make sure you…

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Answer 9

Traditionally, trailer manufacturers did not use electric brakes on boat trailers because the brake magnet wiring and trailer wiring did not always have the best insulation or water protection. These days, more and more manufacturers are using…

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Answer 10

Even though I cannot comment specifically on the grease you used because I am not familiar with it, I can tell you the best grease for trailer bearings is a a grease with a rating of GC-LB, which just means it is made to withstand very high…

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Answer 11

To find the load capacity for your axle you should look on the trailer VIN plate or sticker that lists the VIN number. The weight rating of the axle should be listed on that same plate or sticker. Also, the axle could have a tag or plate on it that…

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Answer 12

To determine the size of the hub assembly you need to purchase you have to determine which bearings are in the old assembly. If the old assembly has L44649 inner bearings, you would use the hub you chose #8-258-5UC1. If the inner bearings are marked…

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Replacement Disc Brake Surge Coupler for 2004 Nitro Boat Trailer

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