Tektro RL-340 brake levers have a quick release mechanism that, when pushed in, will lengthen the cable to allow to easily disengage the brake from the wheel/disc without needing to deflate the tire.
It's not a big deal, in fact, it's nothing bad, just a little annoying and interesting:
When the brakes pressed when riding, the pin rattles — is there any way to stop that?
Has anyone disassembled the levers before?