When braking I'm hearing a noticible noise, that sounds like a playing card in bike spokes. Not sure what it is. Braking seems normal but the noise is concerning. Please advise! Thanks!
If it's only when the front brake is on, I'd bet loose "bushings" or "rivets" on the floating disc. They need a certain amount of play to work, so not a huge concern unless they are very loose.
Check front pads for wear, there can be a clicking noise when worn out.