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Old 05-03-2019, 03:43 PM   #1 (permalink)
Block Heater
Join Date: Sep 2017
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Trailer brakes issues.

I own a 2004 Lb7 Sierra, with a Curt triflex trailer brake controller on it and a 18ft custom equipment hauler with tandem 7k Dexter axles on it that I use to haul around materials, 2 lawn mowers, and a mid sized tractor. About a month ago, my brake stopped fluctuating between the number I had set the brake for and remained at 0.5 all the time. Adjusting the limit doesn't do anything, with just the mowers are on there it doesn't seem to notice, but hauling around the tractor or a few tons of materials has pushed me a little farther than I'd like for brake pressure. I've googled the brand and getting stuck at .5 but found nothing. I haven't serviced the trailer since I bought it about a year ago, and I planned on repacking/replacing bearings and such relatively soon, but I've never done anything to the brakes on the trailer and not really sure what I should be looking for while I got the tire off. anyone got an idea or suggestion for the cause, where to check, or what to fix? Thanks in advance.

2004 GMC Sierra 2500HD LB7
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Old 05-03-2019, 04:49 PM   #2 (permalink)
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To me, that sounds like either the TBC has failed, or it's in a some kind of failure mode (as in, it thinks something is wrong and is perhaps trying to display an error code?).

I would first try to determine if the truck is the problem or the trailer, by hooking up to another trailer with brakes and seeing if the TBC works or not. And maybe contact Curt directly and see what they say about the TBC staying at .5.

As for working on the brakes, I also bought a 18'/dual 6K axle trailer last year, and finally looked at the brakes this spring (should have done it last year, but I also don't haul heavy stuff, just needed a larger platform to haul equipment around), and they are pretty straightforward drum brakes. One side worked fine, the other side didn't work, as the P.O./manufacturer ran the wiring through the axles, and the wiring had worn through rubbing where it came out. I ripped it out and replaced it with new paired wiring strapped to the outside of the axle.

2004 GMC Sierra 3500 C&C, added 4WD, 6.0L gas, Extended Cab, SLE, Transgo 4L80e-HD2 kit installed
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Old 05-03-2019, 05:36 PM   #3 (permalink)
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Old 05-04-2019, 04:18 PM   #4 (permalink)
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First things first. Get some battery terminal cleaner and spray the connector. Clean it out really well. Then, if you have it get some Deoxit and coat the terminals. If you don’t have deoxit get some dielectric grease and do the same. It may just be a bad connection. Also make sure that you have a good ground; too many trailers are grounded through the ball and that’s not a good thing.
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