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Old 08-18-2016, 07:14 AM   #1
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Acme Dolly axle seal leak and binding brake

On our last trip out west I noticed on the TPMS that the left dolly wheel was running warmer than the right and there was a little oil on the wheel. I also noticed the left side "Vault" hub piston didn't appear to be poking out of the hub, the right side looked OK.

When we got home I pulled the wheels to inspect the brakes. WOAH. The outer pad on the left side was worn almost completely out. the inner pad was worn a little, but was heat stressed and cracked. The pads on the right side looked almost new.


It appeared that the oil was leaking out of the axle from the rear seal, and the oil was causing the brake to bind.

I contacted UFP (The folks that make the axle for Acme) and their tech walked me through how to replace the brakes and rebuild the seals on the axle.

He also gave me a couple pointers on how to make the job easier, i.e. drill a hole in the lower frame so you can reach the lower caliper bolt with a socket wrench.

Also suggestions on how to make sure the leak doesn't happen again.

They sent me new seals and grease for the both hubs at no charge under their 5 year warranty.

I wrote up the entire process, with photos on my sire:

http://www.2001mirada.com/acme-brakes-and-axle/

..

Very good customer support from UFP.


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Old 08-18-2016, 05:01 PM   #2
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Acme Dolly axle seal leak and binding brake

I had to do this last winter. One side of mine leaked on the inner, the other on the outer. As of today after my careful rebuild, no leaks. I rebuilt the calipers as well since I too had one very worn pad and the remaining three were about the same lessor wear.
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Old 08-19-2016, 01:58 PM   #3
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Was your leak at the rear seal or the stainless sleeve o-ring?

ALSO I replaced all 4 pads even though 3 of them looked brand new.
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Old 08-19-2016, 06:09 PM   #4
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My passenger side was the inner and the driver's side was the stainless cap on the outer. On the inner, I had a very slight burr I could feel with my finger tip and smoothed it out prior to re-installation. I had three good pads and one very worn, I replaced all with the UPF pads since all the pads had grease on them. Bleeding is easy if you have someone to help. There is a manual that shows how to bleed on the UPF web site.

I have some photos posted in this thread---->Link
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