Which Brake Assemblies to Replace Rockwell 4074L and 4074R

Question

Question:

We have a late 1990s WandW horse trailer with two axles and four brakes. After talking with WandW they advised that the brakes installed from the Factory were Rockwell 4704L and 4704R. Do you sell a product that could be used in place of those original parts? Regards

asked by: Arlo S

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Expert Reply:

The Rockwell 4704L and 4704R are standard 12x2 electric brake assemblies. I'd recommend using
# AKEBRK-6L for the left and # AKEBRK-6R for the right. Install hardware is available separately as
# BRKH12S.

When you get the hub/drum pulled off, be sure to inspect the inside armature surface of the drum that the brake magnet rides against. If it's pitted or grooved, you'll want to replace the brake drums as well. For a 6-bolt, use # 42866UC3-EZ or # 8-201-9UC3-EZ for an 8-bolt. The hub/drums include the bearings, races, grease seal, lug nuts and dust cap.

expert reply by: Mike L

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Answer 1

The Rockwell American 4704-L and R brake assemblies that you have are standard 12 inch by 2 inch trailer brake assemblies that we do offer replacements for like with the Electric Trailer Brake Assembly - 12" - Left Hand - 5,200 lbs to 7,000…

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Answer 2

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 3

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 4

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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Answer 5

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 6

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 7

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 8

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 9

Depending on how the trailer was made, there will be a few spots you can check to identify the axle. First, if the trailer was pre-made by a specific company, you may be able to find this information in either the paperwork or on a placard somewhere…

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Answer 10

The recommended lug nut torque for your 7,000lb axle depends on a few factors like wheel size, stud size etc. Check out the attached photo which shows the torque specs for a variety of applications. I see you were looking at the Dexter Nev-R-Adjust…

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Answer 11

There really isn't a particular maximum trailer weight that is used to determine when brakes need to be added to both axles of a tandem axle setup. While I do still recommend checking your local laws, I am also not aware of any general laws that…

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Answer 12

Torque specs for wheel lug nuts will vary depending on the diameter of the lugs, type of lug nut and the wheel's material. The linked chart details the recommended torque for many combinations. Dexter Hub/Drum #84546UC3 has 1/2-inch studs and…

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