The best brake controller for your 2021 Audi SQ7 is going to be the Curt Echo Wireless Trailer Brake Controller item # C51180. The Echo plugs directly into your Audi's 7-Way connector and allows you to control the settings through an app on your phone. The Echo is also a proportional brake controller that slows or stops your trailer when your Audi decelerates. It uses Bluetooth to communicate with your phone so you will never have to worry about losing signal. If your phone dies it automatically... view full answer...
I spoke with a representative from Curt and they have not done any fit guide testing on the 2021 Audi SQ7. He also does not have a time table for when they will get the testing done and update their fit guide. However, he did say if you needed a trailer brake controller right away you can use the Curt Echo Wireless Trailer Brake Controller - 1 to 2 Axles - Proportional, part # C51180.
I have included a product description link and a video review link below. view full answer...
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