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Old 02-26-2015, 12:50 AM   #1
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Brake lock up

Thought I had it fixed after working with Dexter a month ago however the same wheel is now locking up again. Had the brake drum turned after initial diagnosis did not detect any other fault. Initially it seemed to fix the problem and we had a trip without noticing any skidding. On our trip this last week however we started noticing it and even turning down the P3 to 4.0 didn't stop the curbside forward wheel from locking up.

Will have to call Dexter back tomorrow. Any ideas?
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Old 02-26-2015, 12:55 AM   #2
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Ross, it is possible that you are just up too high.
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Old 02-26-2015, 01:00 AM   #3
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Maybe- although it is only one wheel locking. Does that sound right?

What are others setting their Prodigy P3's at with the 21?
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Old 02-26-2015, 01:06 AM   #4
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I'd be surprised if the controller setting is the problem. Have you tried backing off the mechanical adjustment on the problem wheel and doing a hard test stop to see how the other wheels handle it and, to see if when backed off, the problem disappears?

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Old 02-26-2015, 06:47 AM   #5
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I'd agree with Ron - the controller is not the likely problem. If there is no contamination/grease on the shoe, the magnet is good, the adjustment of that wheel is good, the other 3 brakes are working normally, the fault is with that hub. Maybe the axle was manufactured with that hub a little off? Calling Dexter sounds like a plan.
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Old 02-26-2015, 10:40 AM   #6
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If you can, return your trailer to the shop that did the the original diagnosis and resurfaced the brake drum. It is good to stay with one source to sort the problem out.
The problem is most probably what Ron said and cannot imagine how a hub can cause the braking problem unless the hub bearings are not correctly adjusted and have excessive free play.
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Old 02-26-2015, 11:14 AM   #7
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Agree with you Bob, and am doing that. In email from Dexter "Did you have someone to check the ohms and amperage from this brake? The ohms reading on this magnet can be between 3.0 ohms to 3.7 ohms per magnet. The amperage should be 3.0 to 3.5 per magnet.

Not sure if the mechanic merely checked that power was going to it or whether is was within the above range. Also, to clarify the problem: it locks up at slow speeds when coming to a stop unless the controller is turned way down, like in the 3.5 range, which isn't enough to effectively have the trailer brakes do their share. The TV is doing probably 75% at that setting. The brake releases immediately afterwards.

Will report back what I find.
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Old 02-26-2015, 01:13 PM   #8
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I've often wondered, what do people set their brake controllers at, and do they vary depending on speed? I've sometimes found that the setting I use while towing at highway speed is too much at low, stop and go, speed. The trailer brakes grab too much in stop and go traffic and I have to back off on my setting. Any input?
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Old 02-26-2015, 01:29 PM   #9
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If you have Prodigy brake controller, it came with set-up instructions. You shouldn't just adopt the setting used by somebody else.
That said, you need a couple people ( one to drive and one to watch ) and a gravel road, with little traffic, to do the set-up.
I'm still messing with mine after six years.
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Old 02-26-2015, 01:53 PM   #10
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Thanks gbaglo. I'm also still messing with mine after many years of towing. It seems like after a fresh brake job or change of tow vehicles there's a need for brake controller adjustments. It's just nice to hear that I'm not the only one doing this. Maybe I just need something to do?
Tom
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