Yes, you just need to remove the split ring, then it’ll fall off.
If you’ve pulled on it with a bearing puller, you may now need a new split ring.
I’m not clear on what the noise is that you’re trying to describe is and you’ve confused me with the “not on the unicycle part”.
I’ve had brake noises from the following:
- Old/worn out/contaminated pads
- Old/warped/contaminated disk
- Loose brake caliper (on a d-brake mount)
- Lack of use (my 36er sat for 3 months not being used and then squealed for about a week)