Which brake do you have? If it’s the one with holes all through it, use something thin like a screwdriver put through the the two holes closest to the barrel muzzle & turn counterclockwise. If it’s an indexing type, you have to hold the index nut & then loosen the brake counterclockwise.
Here’s a video below showing similar.
https://www.youtube.com/watch?v=78vU43lpFp4
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