How to Know When to Replace Trailer Brake Hub Drums

Question

Question:

what is the discard spec for inside dimensions of this drum ? when should I replace them ?

asked by: Shawn

0

Expert Reply:

As long as your existing hub drums are in good condition (no grooves worn in the armature surface that the brake magnet rides on or the surface that the pads grab). For a lot of trailer hub/drums there is a minimum thickness for that to be turned listed on them though.

expert reply by: Jameson C

0

Answer 1

Most likely it's a mechanical problem on the specific assembly that's locking up when you hit the brakes. If it was a short in the wiring they all would be locking up. Best option is to pull the hub off and inspect the assembly to see if you…

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Answer 2

If there is visible signs of wear then it is a good idea to replace the hub/drum with the brake assemblies. If the armature surface where the brake magnet is damaged, or if the area where the bearings ride is showing wear or is damaged it would be…

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Answer 3

Sounds like your brakes aren't working when you use the breakaway kit or when your tow vehicle applies the brakes which leads me to believe the problem isn't the breakaway and it's most likely electrical. I attached a link to a page that…

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Answer 4

The break in process will be the same when replacing one brake and drum as if you were replacing both. Drive the trailer out into an open area, like an empty parking lot. Get up to around 40 MPH and apply the manual override on your brake controller.…

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Answer 5

If the surface on the inside of the drum where the shoe pads make contact isn't smooth then a brake shop may be able to turn the drums. If that surface or the surface where the magnet makes contact (called the armature surface) is discolored then…

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Answer 6

You would know to replace brake shoes the same way you would know with a vehicle. If performance is suffering and adjusting the brakes does not help and there are no other issues causing the poor performance it is probably time to change the brake…

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Answer 7

If the drums look like they are in good shape you don't have to turn them when replacing the assemblies. Take a look at the inside of the drum and if you don't see any grooving or obvious signs of wear they don't have to be replaced.…

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Answer 8

You would know to replace brake shoes the same way you would know with a vehicle. If performance is suffering and adjusting the brakes does not help and there are no other issues causing the poor performance it is probably time to change the brake…

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Answer 9

You cannot really go by miles when determining when brakes should be replaced. You would know to replace them the same way you would know with a vehicle. If performance is suffering and adjusting the brakes does not help and there are no other issues…

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Answer 10

The shorter brake shoe should always be facing the front of the trailer. As well as the "C" shaped arm on the inside of the assembly. See the diagram that shows the different sized shoes and the arm. If the brake is installed correctly I…

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Answer 11

It is absolutely more cost effective to replace entire assemblies instead of brake pads. It's an easier install, the price is about the same, you don't have to be as specific when picking out the replacement parts, and you get all new braking…

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Answer 12

On many drum brakes there are wear indicators at the pad material on the shoes. If the pad material is riveted on and you have reached the rivets then it is time to replace them. If you have the brakes adjusted out all the way and the braking is…

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How to Know When to Replace Trailer Brake Hub Drums

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