Replacement Brake Assemblies for a 7K Trailer with 12 x 3 inch Brake Assemblies

Question

Question:

I have 12x3 inch brakes was told do not make anymore can I use 12x2inch or anyway I can get brakes to use axal Thank you.

asked by: Ken S

1

Helpful Expert Reply:

If you are just wanting to get new brake assemblies you could use part # AKEBRK-7-SA for 12 x 2 assemblies for electric brakes or part # AKUBRK-7 for hydraulic brakes. These measure 12 x 2 inches so they will fit in the hubs you have now, plus they are rated for up to 7,000 lbs axles like that you have. They also fit a brake mounting flange that has a 5 bolt pattern.

Although this will work, I recommend going ahead and replacing your drums as well so that you have an entirely new system that was made for each other. To determine what hubs you will need you can simply remove one of your current hubs and find the inner and outer bearing numbers as well as the number for your grease seal. If you cannot find these numbers then you will want to measure the points B, C, and D on your spindle (see attached picture), using a Digital Caliper # PTW80157, to the 3rd decimal place, for example 0.725. Once we have this information we can then look at the available options for something that is compatible.

I have attached a link to our selection of hub and drum assemblies for you to look through after you find out that information, otherwise you can just let me know what you found out and I will be more than happy to help you find replacement hubs.

expert reply by: Jon G

1

click to enlarge

Answer 1

To replace your 12" brakes I recommend checking out the 7K TruRyde Electric Trailer Brake Kit #TRU96FR or the 5.2K - 7K Hydraulic Trailer Brake Kit #AKUBRK-7 depending on what kind of braking system you have. You'll also need the…

view full answer...

Answer 2

Dexter hub #8-174-5UC3 uses the 5-spoke utility bolt pattern so it is uncommon just like the hub you have. If your existing hub uses inner bearing 25580 and outer bearing 15123 with a seal inner diameter of 2-1/8 inches then this hub is a likely…

view full answer...

Answer 3

Yes we do carry brake assemblies that do allow for braking in reverse and forward. The assembly you referenced is a free-backing assembly. Typically people with surge brake setups prefer this style since it allows the trailer to reverse without the…

view full answer...

Answer 4

Unfortunately, just the outer bearing is not quite enough to figure out what you need for replacement hubs and bearings. For a trailer with that much weight it sounds like you have a tandem trailer. I recommend replacing the bearings and seals on all…

view full answer...

Answer 5

As you have found, 12 x 3 inch brake assemblies are not available. It is possible though that your drum will accept a different size. If you can measure the width of the inside of the drum (where the pads make contact with the drum) you might find…

view full answer...

Answer 6

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.

view full answer...

Answer 7

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…

view full answer...

Answer 8

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.…

view full answer...

Answer 9

The difference between an load range C and load range D tire in the same size is the capacity and psi rating. The two tires will still have the same dimensions and fit on the same wheel. The D rated tire has a higher capacity. For a ST175/80D13 like…

view full answer...

Answer 10

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

view full answer...

Answer 11

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…

view full answer...

Answer 12

Load range B trailer tires are going to have a lower capacity than C load range tires. Basically that, psi rating, and the ply rating are the only differences. A higher load range tire would last a little longer than lower load ranges of the same…

view full answer...