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Can Electric Brake Assemblies Install with Magnet Above Spindle  

Updated 05/08/2025 | Published 05/05/2025

Question:

I have a question for you. my shorlandr boat trailer had hydraulic surge brakes that dont work anymore and Im switching to electric brakes. I bought a set of backing plates and drums. my issue is that if I put the magnets down I cannot put them flat against the mounting bracket. it has a offset spindle from the axle. would it be OK to just rotate them 180 and put the magnets on top?

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Expert Reply:

Hey Andrew, yes you can rotate your brake assemblies so that the magnet is above the spindle instead of below and they will work just fine. Are your brake assemblies self adjusting?

expert reply by:
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Jameson C
Andrew profile picture

Andrew

5/7/2025

That's funny because I called yesterday since I didn't receive a reply from my email yet. They told me on the phone that they will not work correctly if the magnets are on top. I already ground down the backing plates to make them fit with the magnets down. No they are not self adjusting.

Jameson C. profile picture
Etrailer Expert

Jameson C.

5/7/2025

@Andrew Hmm...did they say why they didn't think it would work? The magnet is designed to grab the inside of the drum and then depending on how much voltage is coming through it is how hard the brakes apply. This mechanism does not change if the magnet is above the spindle.
Andrew profile picture

Andrew

5/8/2025

@JamesonC they said if the magnet is on top that the weight of the magnet when the breaks aren't being applied could slightly apply while driving
Jameson C. profile picture
Etrailer Expert

Jameson C.

5/8/2025

@Andrew I don't agree with that statement but that's interesting. I've played around with brake assemblies enough to know that you have to push pretty hard on the magnet's arm to get the shoes to move out so that wouldn't be the case.

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