How to Measure to Determine the Size Trailer Brakes Needed For Hydraulic Drum Replacement

Question

Question:

Where does the measurement come from to determine if I have 2-1/4 or 2-1/2inch brakes? I need to replace the brakes on a Road King boat trailer with 3700# axles. It seems the wheel cylinder is blown out and rather than buying piece parts you kits seem to be the best option.

asked by: Chris

1

Helpful Expert Reply:

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 referenced.

expert reply by: Jameson C

1

click to enlarge

Matt O.

8/7/2020

12 x 2.5 drum trisaler brakes i just want the whole brake whitout botor i need probably 5

Jon G.

8/18/2020

Sounds like you're looking for the Brake Kit # 23-428-429 which is rated for a 7,200 lb axle. This kit comes with both the right and left brake assemblies and it doesn't come with the hub and drum - just the brakes.

Joe C.

9/4/2025

10" x 2.5" - double axle can you give me a part number

Jameson C.

9/4/2025

@JoeC Are you sure the width is 2.5 inch and not 2.25 inch?

Joe

9/4/2025

2.25 sorry

Jameson C.

9/4/2025

@Joe Gotcha, you'd just need the # AKEBRK-35-SA.

See All (7) Replies to Joe C. ∨

Answer 1

Hi Christopher! While we do not have full kits for brakes and drums, we can definitely put one together! Do you happen to know the bearing numbers for the axle? Easiest way to know would be to find the axle tag/sticker and see what Sloan says, but we…

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Answer 2

Hey Nick, it sounds like your trailer is a single axle and you are needing a brake line kit for it. For that we have the part #DM5643 which has a 20 foot main line or the part #DM6097 which has a 15 foot main line.

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Answer 3

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 4

The Electric Trailer Brake Kit - 10 inch - Left and Right Hand Assemblies - 3,500 pounds #AKEBRK-35 is the correct brake set up for your Kelsey Hayes 602027 and 602028 and even though your trailer is rated for 2,750 pounds the 3,500 pound brakes will…

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Answer 5

Since your 2016 Toyota 4Runner has a factory 7-way there is a brake controller connector port by the emergency brake pedal. If you check out the picture I attached you can see where the connector is located. The part #3041-P is the connector that…

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Answer 6

Hey Randy! I checked online and your 2014 Lincoln MKX weighs anywhere from 4,251 to 4,429 lbs depending on options. So unless you're hauling a set of weights in your SUV, you'll be well under that 5,000 lbs capacity your RV has. As long as…

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Answer 7

The first thing that we will want to look at for your 2013 Lincoln MKX is a base plate kit so that we can attach the tow bar to your Lincoln. I recommend using the Blue Ox Base Plate Kit #BX2625 because it is very easy to use, and when you are not…

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Answer 8

Hello Chris, sorry to hear about what happened to your awning. We carry the Lippert/Solera awnings here, so we certainly may have replacement parts for you, but it depends on what kind of awning you have currently. There is no way to look this up…

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Answer 9

I currently have four different self-adjusting assemblies for your boat trailer with 10" x 2-1/4" electric drum brakes. You can choose from the following: -Terran Axle Electric Trailer Brakes #TX97ZJ (3,500 Axles) -etrailer Electric Trailer…

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Answer 10

Hi Ben; the difference in the drum size won't make a difference as long as you have a #84 spindle with #L68149 inner and #L44649 outer bearings. The #AKHD-545-35-EZ-K is 10" x 2-1/2" while the #84546UC3-EZ is 10" x 2-1/4" and…

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Answer 11

It sounds like you are speaking of the wires for the brake magnets. If this is correct, you will need to connect one of the wires to the brake controller output wire on your trailer connector and the other wire will need to be grounded to a clean…

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Answer 12

On Dexter 12" Nev-R-Adjust Electric Brake Assembly #23-458 the shoe pad thickness is 3/16 of an inch. Dexter says that you should replace the shoes if the material gets down to 1/16 of an inch thick or less.

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How to Measure to Determine the Size Trailer Brakes Needed For Hydraulic Drum Replacement

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