Brake magnet wearing faster than shoes - Escape Trailer Owners Community

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Old 05-22-2018, 02:24 PM   #1
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Brake magnet wearing faster than shoes

I just began my first bearing/brake maintenance on our 2015 Escape 21 and am puzzled that the brake magnet appears to need replacing while the shoes look in good shape and have lots of wear left in them. The drum is smooth where they ride as well. Can one of the knowledgable forum members tell me what might be going on?

The 4 wear holes in the magnet are not very deep, maybe 0.030". How deep are they on a new magnet?

I am told = that if you need to replace shoes on the trailer it is cheaper to just replace the whole brake plate and components. Is this the same if just the magnets are worn? Oh and the drum surface that the magnet wears on is scored somewhat, but not overly bad. If I got new magnets the drum would need to be turned.

Advice?

Bob K
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Old 05-22-2018, 04:09 PM   #2
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Originally Posted by Bobbito View Post
I just began my first bearing/brake maintenance on our 2015 Escape 21 and am puzzled that the brake magnet appears to need replacing while the shoes look in good shape and have lots of wear left in them. The drum is smooth where they ride as well. Can one of the knowledgable forum members tell me what might be going on?

The 4 wear holes in the magnet are not very deep, maybe 0.030". How deep are they on a new magnet?

I am told = that if you need to replace shoes on the trailer it is cheaper to just replace the whole brake plate and components. Is this the same if just the magnets are worn? Oh and the drum surface that the magnet wears on is scored somewhat, but not overly bad. If I got new magnets the drum would need to be turned.

Advice?

Bob K
Here's what Dexter says about checking the magnets. I suppose I'd replace the whole assembly if it's cheaper, but I don't know how much they run.
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Old 05-22-2018, 05:21 PM   #3
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I cannot tell you why the magnet is apparently wearing faster than the shoes. I can tell you that on our 19, one of The brakes had a wire pull apart on the magnet feed and this led to poor braking on one wheel. The trailer had about 45,000 or so on it so I decided to do the brakes. Our local dexter dealer had a display with which I was able to compare wear on the shoes and the magnets. There’s not the meat on them shoes like there used to be. From there I took a drum to my brake guy who told me he did not recccomend turning them. Turning down walk in money and having dealt with him for 33 years, I trusted him and still do. I bought the whole assembly, backing plate, levers, shoes, magnets, springs, adjuster, wire and nuts for $32.00
A wheel. No core charge. I did buy shrink type connectors for the magnet wires which cost me another couple bucks I think. Course I got a free pop and a fresh donut while he pulled the parts. It’s not a big job to change them out. 11/16 wrench for the 4 nuts that hold the backing plate on. These were the straight brakes, not the never adjust which were more. I would buy the whole assemblies again when i need to for the 21,. You might check the voltage coming to each magnet, the action to the drum might differ with voltage, not sure. Devious hombre’ that I am, I mentioned to the trailers owner that I might need a new impact wrench to do the job and being the daughter of a master body and fender man, she knew a man couldn’t work without tools. The Milwaukee was a lot more than the brakes. Hope this helps.
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Old 05-22-2018, 05:51 PM   #4
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I can tell you that on our 19, one of The brakes had a wire pull apart on the magnet feed and this led to poor braking on one wheel.
Iowa Dave
My trailer wasn't very old when I was one stage away from that situation also.

Or maybe it's the exact opposite. What about this possibility, that the other brake on the same side isn't working and all the braking is being done by the one brake leading to high wear.

I think the brake connections are something that should get checked once in a while.

Ron
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Old 05-22-2018, 08:39 PM   #5
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I was careful to cut the wires off cliose to the magnet so I’d have plenty to hook up to. As I was putting the wires together one suddenly became longer. I knew it wasn’t magic so I stripped back the plastic wire protector and that’s when I saw the loose wire. It had been short crimped and was corroded. I knew it had worked to some degree but never carried the full voltage. The other three pairs were fine. That’s when I went back to Midwest wheel and got shrink connectors and took my time crimping and shrinking them. I’ll check the 21 in a week or so, I had it out at the end of April but only about 250 miles down and back and everything worked nice. I’m glad there’s a term for thorough checking that the lawyers taught me. Due diligence. The old man just said take your time and use your head for something besides a hat rack.
He could be a little crazy. He’d finish a brake job, back the car slowly off the hoist ramps and floor it in reverse towards the highway then jam on the brakes and stop the car a few feet short of the road. Then get out and walk away like it was nothing special. Used to make some customers crazy. The European theatre changed people.
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Old 05-23-2018, 12:13 AM   #6
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So I got two opinions about the magnets wearing faster than the shoes. An RV repair shop I have used a lot in the past said that it is variable as to which wears faster. An old timer at Lordco parts suggested that if the brakes weren't adjusted for a long period of time the magnet might have to work harder to apply the same amount of braking. In hind sight I haven't adjusted the brakes in 3 years because we don't travel that much and the brakes seemed to work fine. It could be that the magnets ended up doing more work to compensate for the extra brake shoe travel.

Regardless, I had to replace the magnets and so decided to get new braking plates with new components. That left the scored surface of the drum where the magnet rides. I looked into getting the drums turned and to just do the magnet surface would have cost $38 x 4. I would have gone for that but my wife convinced me to get new drums (gives her peace of mind). So the total for 4 new brake plates (with components) and 4 new drums (with new bearings and seals) was $800 Canadian. I checked with a couple of RV places and they would have charged at least $1200 for the labor and parts. I am ahead $400 by doing it myself, but I sure wish it was cheaper.

As I bolted on the first new brake plate I found that ETI had a fitting attached to the back of the old brake plate to clamp the end of the protective sleeve for the wiring. The new brake plate had no such fitting, so I ended up removing the fitting from the old one (where it was screwed into an interesting piece of hardware that was like a hollow pop rivet with threads) and pop riveting it to a different sized hole in the new brake plate (change in Dexter's brake plate).

Once again, it pained me to have to get new brake plates and components because of the magnets, when the shoes and drum surface they work on were in excellent shape. I will definitely be adjusting my brakes yearly to see if it improves the life of the magnets.

Bob K
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Old 05-23-2018, 04:26 AM   #7
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As I bolted on the first new brake plate I found that ETI had a fitting attached to the back of the old brake plate to clamp the end of the protective sleeve for the wiring. The new brake plate had no such fitting, so I ended up removing the fitting from the old one (where it was screwed into an interesting piece of hardware that was like a hollow pop rivet with threads) and pop riveting it to a different sized hole in the new brake plate (change in Dexter's brake plate).

They are a handy piece of hardware to know about, I've used them on my old trailer when needing to attach screws to the thin Filon fiberglass siding. Nutserts is what the machine shop guys called them, but I've seen other names for them too.
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Old 05-23-2018, 06:33 AM   #8
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Brakes

Quote:
Originally Posted by Bobbito View Post
So I got two opinions about the magnets wearing faster than the shoes. An RV repair shop I have used a lot in the past said that it is variable as to which wears faster. An old timer at Lordco parts suggested that if the brakes weren't adjusted for a long period of time the magnet might have to work harder to apply the same amount of braking. In hind sight I haven't adjusted the brakes in 3 years because we don't travel that much and the brakes seemed to work fine. It could be that the magnets ended up doing more work to compensate for the extra brake shoe travel.

Regardless, I had to replace the magnets and so decided to get new braking plates with new components. That left the scored surface of the drum where the magnet rides. I looked into getting the drums turned and to just do the magnet surface would have cost $38 x 4. I would have gone for that but my wife convinced me to get new drums (gives her peace of mind). So the total for 4 new brake plates (with components) and 4 new drums (with new bearings and seals) was $800 Canadian. I checked with a couple of RV places and they would have charged at least $1200 for the labor and parts. I am ahead $400 by doing it myself, but I sure wish it was cheaper.

As I bolted on the first new brake plate I found that ETI had a fitting attached to the back of the old brake plate to clamp the end of the protective sleeve for the wiring. The new brake plate had no such fitting, so I ended up removing the fitting from the old one (where it was screwed into an interesting piece of hardware that was like a hollow pop rivet with threads) and pop riveting it to a different sized hole in the new brake plate (change in Dexter's brake plate).

Once again, it pained me to have to get new brake plates and components because of the magnets, when the shoes and drum surface they work on were in excellent shape. I will definitely be adjusting my brakes yearly to see if it improves the life of the magnets.

Bob K
Glad to hear you got everything working again. Nursert is the trademarked name those things are also called river nuts. You can but a cheap install kit at a place like Harbor Freight if youíre in the states. For no more than most people would use it, not a bad way to go. First time you need to lay on those brakes after you burnish them in, the lingering bitter taste of the expense will go away. I find this is true of good tires, and steering and suspension parts too.
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Old 05-23-2018, 09:05 AM   #9
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Bob peace of mind is worth something, but I agree thatís a lot of money for the whole assembly.

If you think about it for a minute the position on the drum where the magnets start to engage doesnít make any difference, during a braking event the magnets are engaged and contacting the drum for a period of time/revolutions. So if the magnets wear prematurely they must be made of a softer metal (not likely), be held tighter to the drum due to stronger magnetism (due to a higher setting on the controller). Wether the shoes are adjusted or not should have no effect on magnet wear.

Cheers
Doug
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Old 05-23-2018, 02:17 PM   #10
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Nursert is the trademarked name those things are also called river nuts
Or with the typos corrected to make searching easier for other people...
Nutsert is the trademarked name those things are also called rivet nuts
For trailer owners in Canada, Princess Auto is an equivalent source:
45 pc Threaded Insert and Riveting Tool Kit (metric threads)
80 pc Metric Replacement Inserts
45 pc Threaded Insert and Riveting Tool Kit (inch threads)
80 pc SAE Replacement Inserts
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