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 > Trailer Electric Brakes shudder at low speed....Why?

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Baja Man

Inland Empire, CA

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Posted: 04/15/19 09:05pm Link  |  Quote  |  Print  |  Notify Moderator

My new to me Toyhauler has brakes that bite hard and shudder when stopping at speeds of less than 5mph (when coming to a stop).

What is the usual culprit for this issue?

Is this a common issue for older brakes?

The trailer sat for the last two years.
Brakes are Dexter and are on 6000# Dexter axles (8 lug).

I'm assuming all parts are original since original owner said he never serviced brakes over the years as they always worked fine.

Thanks


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jkwilson

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Posted: 04/15/19 11:47pm Link  |  Quote  |  Print  |  Notify Moderator

How much has it been hauled since you got it? Could just need some road time. But if the PO didn’t service the hubs, they could stand a look with new seals and repacking the bearings.


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RCMAN46

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Posted: 04/15/19 11:51pm Link  |  Quote  |  Print  |  Notify Moderator

Rust on the brake drums.

Out of round brake drums.

If rust do several hard stops from 60 mph.

wanderingaimlessly

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Posted: 04/16/19 06:13am Link  |  Quote  |  Print  |  Notify Moderator

A few years back I bought a little mitsubishi mirage, brakes pulsed badly when I test drove, told dealer and he offered an additional $200 off price, so I took it. By the time i drove it 120 miles home, they were fine. These were disc, and when I took the wheels off to check you sould still see some discoloration where the pads had sat against one spot on the disc for a long period.
Drove it another 20,000 miles before replacing.
As RCMAN said, drive around some, a few somewhat firmer stops and it likely will ease.

valhalla360

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Posted: 04/16/19 07:37am Link  |  Quote  |  Print  |  Notify Moderator

Most likely just need a little use to knock the rust off.

Had a similar issue on our last trailer and cleared up after the first couple days of towing.


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big buford

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Posted: 04/16/19 09:19am Link  |  Quote  |  Print  |  Notify Moderator

I would adjust shoes first and see if that helps. Also possible a seal went bad and you have some grease on shoes.


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SoundGuy

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Posted: 04/16/19 01:13pm Link  |  Quote  |  Print  |  Notify Moderator

None of the above. [emoticon] I had the same problem with our then new Coachmen but my dealer tech knew of a solution that would solve it - chamfering the leading edge of each brake shoe. That did it, no more shuddering, ever. [emoticon]


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ppine

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Posted: 04/16/19 01:20pm Link  |  Quote  |  Print  |  Notify Moderator

Many brake controllers have two adjustments.
One is the magnitude of the pulse to the brakes which is obvious and adjusted with numbers
Not so obvious on many controllers is a little slide adjustment on the side which controls how aggressive the brakes are. Reduce the aggressiveness of your brakes. Look under there with a headlamp and see if you can find it.

Baja Man

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Posted: 04/24/19 11:51am Link  |  Quote  |  Print  |  Notify Moderator

I guess I will remove drums and inspect. I will service as needed. I have read about chamfering leading edge of shoes, and will sand them down these leading edges.
I also know about arcing shoes to drums but I believe that may be a practice rarely employed anywhere/anymore.

When the time comes to replace shoes, I will search for someone (hopefully near me) that will turn drums and arc shoes accordingly.

kellertx5er

Keller TX

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Posted: 04/26/19 02:44pm Link  |  Quote  |  Print  |  Notify Moderator

Baja Man wrote:

I guess I will remove drums and inspect. I will service as needed. I have read about chamfering leading edge of shoes, and will sand them down these leading edges.
I also know about arcing shoes to drums but I believe that may be a practice rarely employed anywhere/anymore.

When the time comes to replace shoes, I will search for someone (hopefully near me) that will turn drums and arc shoes accordingly.


Chamfering the shoes does basically the same as arcing used to do- eliminates the 'grabiness'.


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