This story begins when I offered to haul my friend's Aerostar van for him. He lives at the top of a very steep gravel hill.
We drove the van on the trailer, strapped it down tight, set the weight distributing hitch and I headed down the hill. It was all going well until I hit the brakes.
Vintage Tie Clip
Basically there were none. Only the fronts on the Suburban were locking. I pushed the big red button on my home made trailer brake controller giving them the full 13.7 volts but nothing. Well practically nothing. I was still going down way faster than I wanted to!
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Customer Reviews
*** Product Information and Prices Stored: Feb 22, 2012 13:01:57
The trailer brakes should have locked up solid when the red button is pushed making all at least slide level - instead of the trailer trying to pass the Suburban. Talk about the cart before the horse!
The way the load was pushing colse to that Suburban, I was really glad I had not tried to tow with my diminutive Jeep Cherokee.
Once that job was done I backed the trailer into the shop to take my first look at those trailer brakes. I have owned this trailer for nearly twenty five years and I have never seen inside the brake drums on it. I guess it was about time.
My inspection of the first drum showed me a diminutive about how galvanic trailer brakes work. There is an electromagnet that pulls against the inside of the drum. The friction of the magnet against the drum moves one shoe that in turn moves the other shoe with a cam action.
Pretty simple. But I did not see anyone wrong. The shoes looked fine, the drum was fine except for some scoring where the magnet rubbed. I put power to the magnet and it seemed to pull Ok. But, the friction of the magnet against the drum was obviously not enough to work the shoes.
I could not form out how a magnet could go bad, but that is what it seemed. Time for some Internet research.
I finally found a site that said magnet failure was tasteless on galvanic trailer brakes. So I went shopping for trailer brake magnets. Most places wanted more for the magnet than I could buy the whole backing assembly for. To get one at a local parts store I would have to pay more than I could buy two backing assemblies for. And new magnets are included in the backing plate assemblies.
Just when I was about to give up and order new assemblies, I stumbled upon Auto protection House. They could use some work on their web site, but they have great prices.
I found a pair of new drums on e bay and I was the only someone who bid so I got both for the price of one. Then the wait for Danny - my Ups driver - to bring them to me. naturally the drums and magnets arrived on dissimilar days so he got to visit with my dog Smash twice.
Upon closer inspection of the trailer brakes, I noticed that I still did not understand how they worked. Something just did not look right about the way the cams worked. It sure looked like they would be stronger in reverse. And this trailer has all the time been tough to back up when the brakes are working right.
A quick look at the Dexter Brakes web site confirmed my suspicions. The rear axle on my trailer was installed backwards.
I decided the bearings did not really care if they were spinning backwards, so I elected to naturally swap the brake assemblies left to right.
Having them off made installing the magnets and routing the not so diminutive green wires somewhat easier. I found that some lubricant made getting them straight through the grommets a lot easier.
Dexter Magnets are identified by the wire color. The literal, one for my 3500lb axles is the green wire. Nice they have not changed that in 25 years.
The magnets are held in by spring clips that are really hard to get off. I used a small screwdriver and a pry bar and bent them slightly to get them off. The new magnets came with new clips anyway.
I loaded the new bearings with axle grease and installed the new brake drums. They are not Dexter brand but the fit just fine.
The wiring is was pretty easy to reconnect since there is no polarity on the magnets. Just join together one wire to the brake controller power lead and one to ground. Dexter recommends running a cut off ground wire but I just grounded it to the trailer frame like it had been done before.
Now my trailer has brakes again.
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