How to Find the Correct Brake Mounting Flange

Question

Question:

2 inch brake flange for 3500 lb spindle

asked by: Brian

0

Expert Reply:

Capacity is what will have the capacity as opposed to the spindle, and the correct brake mounting flange will depend on the diameter of your axle.

Since you mentioned a 3,500 lbs I assume that is your axle's capacity and typically those have 2-3/8" diameters. For that there is the Brake Mounting Flange for 2-3/8" Round Axle # 4-35. We don't have any flanges for 2" axles, but the other possibility is the Brake Mounting Flange for 1-3/4" Round Trailer Axles # 4-34 which is the typical diameter you see on 2,000 lb axles.

I have added a link to our page with each of our brake mounting flanges for you to take a look at; you will want to verify the diameter of your axle to determine the correct flange.

expert reply by: Kyle S

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Answer 1

For a 3500 lb axle, your options for bearing sizes are greatly narrowed down so that makes things a lot easier. You just need to determine your bolt pattern of your wheels. For traditional 5 on 4-1/2 inch bolt pattern, Trailer Hub and Drum Assembly -…

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Answer 2

The only 4 bolt mounting flange we offer that has a 1-3/4 inch hole in the middle is the part #4-34 which is designed for 2k rated axles.

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Answer 3

The 2x2 inch square axle is likely 3,500 lbs or less capacity. I would need more spindle dimensions or bearing numbers to assist. If you pull a hub and measure at the spindle where the bearings and seal ride using the digital caliper like #PTW80157 I…

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Answer 4

The only way to know for sure is to find a stamp or plate somewhere on the axle with its capacity. If this isn't available you can use the bearing numbers to determine which spindles the trailer has and we can determine the capacities of the hubs…

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Answer 5

The bolt pattern for a 5 bolt brake mounting flange, like #4-44-1 is 5 on 3-7/8 inches. What that means is it measures 3-7/8 inches from one corner to its diagonal counterpart. From hole to hole across the bottom is 3 inches and between the others is…

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Answer 6

For a 3500 lb axle, having a mounting bolt pattern of 2-7/8 inches is typical. The only exception would be for a few 4400 lb axles, which use a mounting bolt pattern of 2-13/16. I checked with Dexter Axle, and was told that the 69-47 designation…

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Answer 7

Welding a mounting flange, possible item #4-35, is a very precise installation. The flanges need to be installed square and concentric to the hub and drum assembly and each other. If the flange is installed incorrectly rapid brake lining wear,…

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Answer 8

In order to add electric brakes to your trailer there are a few things needed. I have attached a link to a helpful article that explains how to add electric brakes to a trailer an what is needed. Some of the things you will need to know are the…

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Answer 9

There is a special jig required to weld on brake mounting flanges such as #4-35. The flange needs to be welded on concentric and square. Square meaning the flange must be a true 90 degrees from the spindle and concentric meaning the gap around the…

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Answer 10

I have brake mounting flanges that will work for you. We have several different types and sizes so you will need to find the right size and then have it welded on by a licensed professional welder. For example, for a 2-3/8 inch round axle we carry a…

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Answer 11

You can have brake flanges welded to your current 3,500 lb axle spindles with the part #4-35 and you'd then be able have brakes assemblies bolted on. For 3,500 lb axles you will use 10 inch assemblies. My recommendation is the Electric Trailer…

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Answer 12

The bolt pattern of the drum has nothing to do with the mounting pattern of a brake assembly. The drum bolt pattern is going to have to match the wheels you are using. The brake mounting pattern needs to match the flange that it bolts to. There are 2…

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How to Find the Correct Brake Mounting Flange

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