Determining Which Brakes Fit 10" x 2-1/2" Drums On Boat Trailer

Question

Question:

so measuring the inside of my brake drum im getting 10x 2.5, i would have to guess 2.25 would be what its being called, or do i have an odd size? in assuming i would need a 2.25 i cannot figure out what the difference is between these 2 parts could you explain the differences to me? T4423500-400 T4071600-500 also it looks liked i have dexter drums, i doubt it matters on the brand, however i figured id ask someone more knowledgeable then myself, or should i be looking for dexter parts? what i know of this trailer, is that its tabbed to be a 4500 gvw and theres a big boat on top of it. its 5 lug and i cant find any axle tags to speak of. any info would be great, thank you

asked by: Bob

0

Expert Reply:

Based on the information you provided either the Titan Hydraulic Brake Kit - Free Backing - 10" - Left and Right Hand Assemblies - 3,750 lbs # T4071600-500 or # T4423500-400 will fit your drums.

The only difference between these two brakes is the # T4071600-500 are made of standard metal where the # T4423500-400 have a Galphorite coating giving it superior corrosion resistance.

Since you are putting these brakes on a boat trailer I recommend the # T4423500-400 as they will be less likely to rust.

Neither option includes new mounting hardware, so if you need new bolts to attach the brakes I recommend the # BRKH10A

I included videos of both of the products mentioned for you to take a look at.

expert reply by: Samuel C

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Answer 1

Hey Tim, thanks for the picture of your current brake assemblies. While what you have doesn't look exactly like a free-backing setup you definitely can replace what you have with them. For that I would go with the etrailer part #AKFBBRK-35 which…

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Answer 2

What it sounds like is happening with the Dexter Hydraulic Brake Kit - Free Backing - Galphorite - 10" - Left/Right Hand - 3,750 lbs #T4423500-400 locking up when wet is the shoe has likely absorbed moisture and expanded, causing the lock up.…

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Answer 3

To determine the correct brake kit you'll need to measure the diameter of the brake pads (from one side of the assembly to the other). If it is 10" and you have hydraulic brakes then I recommend the Titan Free Backing Kit #T4071600-500, but…

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Answer 4

The Dexter Hydraulic Trailer Brake Kit #23-312-313 that you referenced are standard uni-servo assemblies and are not free-backing. These will not automatically disengage when going in reverse with the trailer. For 3,500 pound free-backing assemblies…

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Answer 5

Your trailer must have free backing brakes if you have never used the surge brake actuating coupler reverse lockout. If you did not have free backing brakes, your brakes would most likely brake even if they didn't lock up when you back up because…

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Answer 6

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 7

The three sizes of electric trailer drum brakes you referenced, 7-, 10- and 12-inch diameters, are intended for different axle weight capacities. Since each size will presumably have a proportionate weight load it has to stop, their wear rates will…

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Answer 8

I recommend using the Hydraulic Brake Kit - Uni-Servo - Free Backing - Dacromet - 10" - Left/Right Hand - 3,500 lbs #AKFBBRK-35-D, which will work with your current setup and are perfect because the Dacromet plating is designed to withstand…

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Answer 9

Typically the brake magnet of an assembly is held on with clips like the part #BP19-001. If you have the part #23-27 then what you'd need is the #BP19-001.

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Answer 10

It sounds like you either have bad grounds for the brake assemblies or you are using too small of gauge for the brake assemblies themselves. The brake output circuit should be 10 gauge wire like the part #10-1-1 which is sold by the foot. Make sure…

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Answer 11

You will need to do some measuring to determine if the 10 Inch Electric Brake Assembly LH, item #AKEBRK-35L, is the correct assembly for your trailer. Measure the diameter of the mounted brake shoe, the width of the lining and the distance between…

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Answer 12

For your Macgregor boat trailer with 3,500 lb axle, you will want the Demco Hydraulic Brake Kit - Free Backing - Galvanized - 10" - Left/Right Hand Assemblies - 3.5K #40716-15. This galvanized assembly will work great for your boat trailer to…

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