Rear brake circlip 2014-2021

This is the circlip that goes onto the end of the brake caliper bolts that hold the pads in place (and hold the caliper to the bracket). If you forget to install this circlip and the bolts loosen up at all, they can back out entirely. I've had a couple bikes come in where the circlip saved the owner from some expensive damage.

They're also easy to lose after they shoot across the room during removal or installation.