that is the way to do it.
AND ....
I did it differently because I didn't like how it looked out there in the wind.
I mounted the bracket with the same orientation on the other side of that same bolt, inside the frame rail. I then send the spring to the angle arm to which the foot lever is attached by spline fitting.. (it's that part that levers the brake actuator arm next to the swing arm).
If this isn't clear from my description I can go take a photo of it for you