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Open Roads Forum  >  Fifth-Wheels

 > Are these brake magnets warn?

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BurbMan

Indianapolis, IN

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Posted: 06/03/22 03:25pm Link  |  Quote  |  Print  |  Notify Moderator

If shoes and drums are smooth them I would leave them for now. Bear in mind that you will need to order new drums when you do brakes...very few shops even turn brake drums anymore, and I was not able to find ANY that would do a trailer drum because the inside face where the magnet rides needs to be turned too.

Last time I did brakes on the TT I got the 4 brake assemblies, new bearings, new seals, and new drums from etrailer for about $500 delivered.

ALSO: be sure you get self-adjusting assemblies, upgrade from that post-WWII technology where you have to adjust the brakes manually with a brake tool.

MN Ben

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Posted: 06/04/22 08:54pm Link  |  Quote  |  Print  |  Notify Moderator

Well other than leaking seals, everything on these assemblies looks good. I hit them with degreaser and then break cleaner. I did amp and ohm resistance testing on each individual magnet. They all fell within the limits. The assemblies actually look to be a couple of years old with paint still on the springs and very little wear on the back plate. I believe this '08 rig does not have a lot of traveling miles on it even though APR 2007 was printed on the assemblies.
The bearings all cleaned up very nice so after new seals everything went back together.
I do have one question. The hub cavity has room for a good amount of grease. I packed the bearings and greased the races and ended up pumping about 15 squirts with the grease gun into the axle zerk while spinning the wheel. Do I need to pump grease in until in comes through the smaller outer bearing?
Thanks everyone for your help.
Ben


2006 F350 Dually PSD
2008 Keystone Laredo 29RL 5th Wheel

2002 F250 7.3 PSD -SOLD
2004 Lance 1130 -SOLD
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MFL

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Posted: 06/05/22 06:05am Link  |  Quote  |  Print  |  Notify Moderator

Ben...if you hand packed the bearings, there was no reason to use the zerk to fill the cavity at this time.

To answer your question...yes you need to add grease until it comes out the front bearing. Depending on use/miles, you should not need greasing again for several years, maybe more.

It may take a couple cartridges of grease to fill 4 cavities, when the time comes to do it. If you feel you did a proper hand pack, I would just leave it for now, enjoy the tow, you're good.

Jerry





Mike134

Elgin, IL

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Posted: 06/05/22 06:56am Link  |  Quote  |  Print  |  Notify Moderator

The four holes on the magnet are "wear indicators" if any of them are gone it's time to replace the magnet.


2019 F150 4X4 1903 payload
2018 Adventurer 21RBS 7700 GVWR.

MN Ben

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Posted: 06/05/22 03:06pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks Jerry. Thoroughly hand packed.

Thanks Mike134. I should have stuck a toothpick in there to gauge the depth.

This job is done! Thanks again everyone.
Ben

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