Thank you for your purchase from etrailer of the Curt Echo # C51180. Since the Echo and your phone are properly paired, the issue is almost certainly with your trailer's 7-way or wiring which is impeding the brake signal from getting through to your trailer brakes.
Start by taking a look at your trailer's 7-way connector to to see if there is any type of damage or corrosion built up that may be hampering its functionality. If there is you will need to replace it with the 7-Way Molded Trailer... view full answer...
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