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RJM: JMHO, but I wouldn't throw money at a controller just yet! The Prodigy has the ability to troubleshoot for you and if it isn't showing any fault codes during braking events but rather simply shows the voltage going to your brakes, then it probably is not a controller issue but more than likely a brake hardware issue.
When you say your controller is set just before brake lock-up, that could mean you are set a little too high initial voltage.
I have mine set for boost #2 with about 4 -6 volts max initial feed with stationary trailer and a firm foot application and I only have 2 axles. You may be experiencing all of your axles coming close to lock-up bacause you're just feeding way too much voltage. That can get expensive if you start flat-spotting your tires as they will shake the h--l out of your trailer.
During one of those bucking events, it would be really convenient/helpful if you could eyeball your controller readout to see what's going on vis-a-vis voltage delivery.
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Sandra, Bruce
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